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691 lines
20 KiB
TypeScript
691 lines
20 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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/** A snapshotting library.
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*
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* The `assertSnapshot` function will create a snapshot of a value and compare it
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* to a reference snapshot, which is stored alongside the test file in the
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* `__snapshots__` directory.
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*
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* ```ts
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* // example_test.ts
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* import { assertSnapshot } from "@std/testing/snapshot";
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*
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* Deno.test("isSnapshotMatch", async function (t): Promise<void> {
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* const a = {
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* hello: "world!",
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* example: 123,
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* };
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* await assertSnapshot(t, a);
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* });
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* ```
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*
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* ```js
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* // __snapshots__/example_test.ts.snap
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* export const snapshot = {};
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*
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* snapshot[`isSnapshotMatch 1`] = `
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* {
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* example: 123,
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* hello: "world!",
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* }
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* `;
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* ```
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*
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* Calling `assertSnapshot` in a test will throw an `AssertionError`, causing the
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* test to fail, if the snapshot created during the test does not match the one in
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* the snapshot file.
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*
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* ## Updating Snapshots:
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*
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* When adding new snapshot assertions to your test suite, or when intentionally
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* making changes which cause your snapshots to fail, you can update your snapshots
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* by running the snapshot tests in update mode. Tests can be run in update mode by
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* passing the `--update` or `-u` flag as an argument when running the test. When
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* this flag is passed, then any snapshots which do not match will be updated.
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*
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* ```sh
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* deno test --allow-all -- --update
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* ```
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*
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* Additionally, new snapshots will only be created when this flag is present.
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*
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* ## Permissions:
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*
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* When running snapshot tests, the `--allow-read` permission must be enabled, or
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* else any calls to `assertSnapshot` will fail due to insufficient permissions.
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* Additionally, when updating snapshots, the `--allow-write` permission must also
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* be enabled, as this is required in order to update snapshot files.
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*
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* The `assertSnapshot` function will only attempt to read from and write to
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* snapshot files. As such, the allow list for `--allow-read` and `--allow-write`
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* can be limited to only include existing snapshot files, if so desired.
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*
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* ## Options:
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*
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* The `assertSnapshot` function optionally accepts an options object.
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*
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* ```ts
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* // example_test.ts
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* import { assertSnapshot } from "@std/testing/snapshot";
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*
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* Deno.test("isSnapshotMatch", async function (t): Promise<void> {
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* const a = {
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* hello: "world!",
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* example: 123,
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* };
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* await assertSnapshot(t, a, {
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* // options
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* });
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* });
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* ```
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*
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* You can also configure default options for `assertSnapshot`.
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*
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* ```ts
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* // example_test.ts
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* import { createAssertSnapshot } from "@std/testing/snapshot";
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*
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* const assertSnapshot = createAssertSnapshot({
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* // options
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* });
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* ```
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*
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* When configuring default options like this, the resulting `assertSnapshot`
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* function will function the same as the default function exported from the
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* snapshot module. If passed an optional options object, this will take precedence
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* over the default options, where the value provided for an option differs.
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*
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* It is possible to "extend" an `assertSnapshot` function which has been
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* configured with default options.
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*
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* ```ts
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* // example_test.ts
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* import { createAssertSnapshot } from "@std/testing/snapshot";
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* import { stripAnsiCode } from "@std/fmt/colors";
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*
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* const assertSnapshot = createAssertSnapshot({
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* dir: ".snaps",
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* });
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*
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* const assertMonochromeSnapshot = createAssertSnapshot<string>(
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* { serializer: stripAnsiCode },
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* assertSnapshot,
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* );
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*
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* Deno.test("isSnapshotMatch", async function (t): Promise<void> {
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* const a = "\x1b[32mThis green text has had it's colours stripped\x1b[39m";
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* await assertMonochromeSnapshot(t, a);
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* });
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* ```
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*
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* ```js
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* // .snaps/example_test.ts.snap
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* export const snapshot = {};
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*
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* snapshot[`isSnapshotMatch 1`] = `This green text has had it's colours stripped`;
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* ```
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*
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* ## Version Control:
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*
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* Snapshot testing works best when changes to snapshot files are committed
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* alongside other code changes. This allows for changes to reference snapshots to
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* be reviewed along side the code changes that caused them, and ensures that when
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* others pull your changes, their tests will pass without needing to update
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* snapshots locally.
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*
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* @module
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*/
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import { fromFileUrl } from "@std/path/from-file-url";
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import { parse } from "@std/path/parse";
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import { resolve } from "@std/path/resolve";
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import { toFileUrl } from "@std/path/to-file-url";
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import { ensureFile, ensureFileSync } from "@std/fs/ensure-file";
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import { bold, green, red } from "@std/fmt/colors";
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import { assert } from "@std/assert/assert";
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import { AssertionError } from "@std/assert/assertion-error";
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import { equal } from "@std/assert/equal";
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import { diff } from "@std/internal/diff";
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import { diffStr } from "@std/internal/diff-str";
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import { buildMessage } from "@std/internal/build-message";
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const SNAPSHOT_DIR = "__snapshots__";
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const SNAPSHOT_EXT = "snap";
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/** The mode of snapshot testing. */
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export type SnapshotMode = "assert" | "update";
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/** The options for {@linkcode assertSnapshot}. */
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export type SnapshotOptions<T = unknown> = {
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/**
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* Snapshot output directory. Snapshot files will be written to this directory.
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* This can be relative to the test directory or an absolute path.
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*
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* If both `dir` and `path` are specified, the `dir` option will be ignored and
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* the `path` option will be handled as normal.
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*/
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dir?: string;
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/**
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* Snapshot mode. Defaults to `assert`, unless the `-u` or `--update` flag is
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* passed, in which case this will be set to `update`. This option takes higher
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* priority than the update flag. If the `--update` flag is passed, it will be
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* ignored if the `mode` option is set.
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*/
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mode?: SnapshotMode;
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/**
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* Failure message to log when the assertion fails. Specifying this option will
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* cause the diff not to be logged.
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*/
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msg?: string;
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/**
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* Name of the snapshot to use in the snapshot file.
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*/
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name?: string;
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/**
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* Snapshot output path. The snapshot will be written to this file. This can be
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* a path relative to the test directory or an absolute path.
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*
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* If both `dir` and `path` are specified, the `dir` option will be ignored and
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* the `path` option will be handled as normal.
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*/
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path?: string;
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/**
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* Function to use when serializing the snapshot.
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*/
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serializer?: (actual: T) => string;
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};
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function getErrorMessage(message: string, options: SnapshotOptions) {
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return typeof options.msg === "string" ? options.msg : message;
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}
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/**
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* Default serializer for `assertSnapshot`.
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*
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* @example Usage
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* ```ts
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* import { serialize } from "@std/testing/snapshot";
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* import { assertEquals } from "@std/assert/assert-equals";
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*
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* assertEquals(serialize({ foo: 42 }), "{\n foo: 42,\n}")
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* ```
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*
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* @param actual The value to serialize
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* @returns The serialized string
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*/
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export function serialize(actual: unknown): string {
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return Deno.inspect(actual, {
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depth: Infinity,
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sorted: true,
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trailingComma: true,
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compact: false,
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iterableLimit: Infinity,
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strAbbreviateSize: Infinity,
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breakLength: Infinity,
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escapeSequences: false,
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});
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}
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/**
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* Converts a string to a valid JavaScript string which can be wrapped in backticks.
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*
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* @example
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*
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* "special characters (\ ` $) will be escaped" -> "special characters (\\ \` \$) will be escaped"
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*/
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function escapeStringForJs(str: string) {
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return str
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.replace(/\\/g, "\\\\")
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.replace(/`/g, "\\`")
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.replace(/\$/g, "\\$");
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}
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let _mode: SnapshotMode;
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/**
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* Get the snapshot mode.
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*/
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function getMode(options: SnapshotOptions) {
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if (options.mode) {
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return options.mode;
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} else if (_mode) {
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return _mode;
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} else {
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_mode = Deno.args.some((arg) => arg === "--update" || arg === "-u")
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? "update"
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: "assert";
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return _mode;
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}
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}
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/**
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* Return `true` when snapshot mode is `update`.
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*/
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function getIsUpdate(options: SnapshotOptions) {
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return getMode(options) === "update";
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}
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class AssertSnapshotContext {
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static contexts = new Map<string, AssertSnapshotContext>();
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/**
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* Returns an instance of `AssertSnapshotContext`. This will be retrieved from
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* a cache if an instance was already created for a given snapshot file path.
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*/
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static fromOptions(
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testContext: Deno.TestContext,
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options: SnapshotOptions,
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): AssertSnapshotContext {
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let path: string;
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const testFilePath = fromFileUrl(testContext.origin);
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const { dir, base } = parse(testFilePath);
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if (options.path) {
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path = resolve(dir, options.path);
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} else if (options.dir) {
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path = resolve(dir, options.dir, `${base}.${SNAPSHOT_EXT}`);
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} else {
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path = resolve(dir, SNAPSHOT_DIR, `${base}.${SNAPSHOT_EXT}`);
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}
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let context = this.contexts.get(path);
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if (context) {
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return context;
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}
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context = new this(toFileUrl(path));
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this.contexts.set(path, context);
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return context;
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}
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#teardownRegistered = false;
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#currentSnapshots: Map<string, string | undefined> | undefined;
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#updatedSnapshots = new Map<string, string>();
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#snapshotCounts = new Map<string, number>();
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#snapshotsUpdated = new Array<string>();
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#snapshotFileUrl: URL;
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snapshotUpdateQueue = new Array<string>();
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constructor(snapshotFileUrl: URL) {
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this.#snapshotFileUrl = snapshotFileUrl;
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}
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/**
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* Asserts that `this.#currentSnapshots` has been initialized and then returns it.
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*
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* Should only be called when `this.#currentSnapshots` has already been initialized.
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*/
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#getCurrentSnapshotsInitialized() {
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assert(
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this.#currentSnapshots,
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"Snapshot was not initialized. This is a bug in `assertSnapshot`.",
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);
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return this.#currentSnapshots;
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}
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/**
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* Write updates to the snapshot file and log statistics.
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*/
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#teardown = () => {
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const buf = ["export const snapshot = {};"];
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const currentSnapshots = this.#getCurrentSnapshotsInitialized();
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const currentSnapshotNames = Array.from(currentSnapshots.keys());
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const removedSnapshotNames = currentSnapshotNames.filter((name) =>
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!this.snapshotUpdateQueue.includes(name)
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);
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this.snapshotUpdateQueue.forEach((name) => {
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const updatedSnapshot = this.#updatedSnapshots.get(name);
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const currentSnapshot = currentSnapshots.get(name);
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let formattedSnapshot: string;
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if (typeof updatedSnapshot === "string") {
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formattedSnapshot = updatedSnapshot;
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} else if (typeof currentSnapshot === "string") {
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formattedSnapshot = currentSnapshot;
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} else {
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// This occurs when `assertSnapshot` is called in "assert" mode but
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// the snapshot doesn't exist and `assertSnapshot` is also called in
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// "update" mode. In this case, we have nothing to write to the
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// snapshot file so we can just exit early
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return;
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}
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formattedSnapshot = escapeStringForJs(formattedSnapshot);
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formattedSnapshot = formattedSnapshot.includes("\n")
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? `\n${formattedSnapshot}\n`
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: formattedSnapshot;
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const formattedName = escapeStringForJs(name);
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buf.push(`\nsnapshot[\`${formattedName}\`] = \`${formattedSnapshot}\`;`);
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});
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const snapshotFilePath = fromFileUrl(this.#snapshotFileUrl);
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ensureFileSync(snapshotFilePath);
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Deno.writeTextFileSync(snapshotFilePath, buf.join("\n") + "\n");
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const updated = this.getUpdatedCount();
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if (updated > 0) {
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console.log(
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green(
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bold(
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`\n > ${updated} ${
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updated === 1 ? "snapshot" : "snapshots"
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} updated.`,
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),
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),
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);
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}
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const removed = removedSnapshotNames.length;
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if (removed > 0) {
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console.log(
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red(
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bold(
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`\n > ${removed} ${
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removed === 1 ? "snapshot" : "snapshots"
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} removed.`,
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),
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),
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);
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for (const snapshotName of removedSnapshotNames) {
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console.log(
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red(bold(` • ${snapshotName}`)),
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);
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}
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}
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};
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/**
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* Returns `this.#currentSnapshots` and if necessary, tries to initialize it by reading existing
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* snapshots from the snapshot file. If the snapshot mode is `update` and the snapshot file does
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* not exist then it will be created.
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*/
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async #readSnapshotFile(options: SnapshotOptions) {
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if (this.#currentSnapshots) {
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return this.#currentSnapshots;
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}
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if (getIsUpdate(options)) {
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await ensureFile(fromFileUrl(this.#snapshotFileUrl));
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}
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try {
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const snapshotFileUrl = this.#snapshotFileUrl.toString();
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const { snapshot } = await import(snapshotFileUrl);
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this.#currentSnapshots = typeof snapshot === "undefined"
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? new Map()
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: new Map(
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Object.entries(snapshot).map(([name, snapshot]) => {
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if (typeof snapshot !== "string") {
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throw new AssertionError(
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getErrorMessage(
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`Corrupt snapshot:\n\t(${name})\n\t${snapshotFileUrl}`,
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options,
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),
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);
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}
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return [
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name,
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snapshot.includes("\n") ? snapshot.slice(1, -1) : snapshot,
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];
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}),
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);
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return this.#currentSnapshots;
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} catch (error) {
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if (
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error instanceof TypeError &&
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error.message.startsWith("Module not found")
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) {
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throw new AssertionError(
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getErrorMessage(
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"Missing snapshot file.",
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options,
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),
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);
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}
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throw error;
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}
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}
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/**
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* Register a teardown function which writes the snapshot file to disk and logs the number
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* of snapshots updated after all tests have run.
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*
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* This method can safely be called more than once and will only register the teardown
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* function once in a context.
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*/
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registerTeardown() {
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if (!this.#teardownRegistered) {
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globalThis.addEventListener("unload", this.#teardown);
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this.#teardownRegistered = true;
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}
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}
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/**
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* Gets the number of snapshots which have been created with the same name and increments
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* the count by 1.
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*/
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getCount(snapshotName: string) {
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let count = this.#snapshotCounts.get(snapshotName) || 0;
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this.#snapshotCounts.set(snapshotName, ++count);
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return count;
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}
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/**
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* Get an existing snapshot by name or returns `undefined` if the snapshot does not exist.
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*/
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async getSnapshot(snapshotName: string, options: SnapshotOptions) {
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const snapshots = await this.#readSnapshotFile(options);
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return snapshots.get(snapshotName);
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}
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/**
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* Update a snapshot by name. Updates will be written to the snapshot file when all tests
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* have run. If the snapshot does not exist, it will be created.
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*
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* Should only be called when mode is `update`.
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*/
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updateSnapshot(snapshotName: string, snapshot: string) {
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if (!this.#snapshotsUpdated.includes(snapshotName)) {
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this.#snapshotsUpdated.push(snapshotName);
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}
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const currentSnapshots = this.#getCurrentSnapshotsInitialized();
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if (!currentSnapshots.has(snapshotName)) {
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currentSnapshots.set(snapshotName, undefined);
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}
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this.#updatedSnapshots.set(snapshotName, snapshot);
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}
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/**
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* Get the number of updated snapshots.
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*/
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getUpdatedCount() {
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return this.#snapshotsUpdated.length;
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}
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/**
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* Add a snapshot to the update queue.
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*
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* Tracks the order in which snapshots were created so that they can be written to
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* the snapshot file in the correct order.
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*
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* Should be called with each snapshot, regardless of the mode, as a future call to
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* `assertSnapshot` could cause updates to be written to the snapshot file if the
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* `update` mode is passed in the options.
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*/
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pushSnapshotToUpdateQueue(snapshotName: string) {
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this.snapshotUpdateQueue.push(snapshotName);
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}
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/**
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* Check if exist snapshot
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*/
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hasSnapshot(snapshotName: string): boolean {
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return this.#currentSnapshots
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? this.#currentSnapshots.has(snapshotName)
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: false;
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}
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}
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/**
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* Make an assertion that `actual` matches a snapshot. If the snapshot and `actual` do
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* not a match, then throw.
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*
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* Type parameter can be specified to ensure values under comparison have the same type.
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*
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* @example Usage
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* ```ts
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* import { assertSnapshot } from "@std/testing/snapshot";
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*
|
|
* Deno.test("snapshot", async (t) => {
|
|
* await assertSnapshot<number>(t, 2);
|
|
* });
|
|
* ```
|
|
* @typeParam T The type of the snapshot
|
|
* @param context The test context
|
|
* @param actual The actual value to compare
|
|
* @param options The options
|
|
*/
|
|
export async function assertSnapshot<T>(
|
|
context: Deno.TestContext,
|
|
actual: T,
|
|
options: SnapshotOptions<T>,
|
|
): Promise<void>;
|
|
/**
|
|
* Make an assertion that `actual` matches a snapshot. If the snapshot and `actual` do
|
|
* not a match, then throw.
|
|
*
|
|
* Type parameter can be specified to ensure values under comparison have the same type.
|
|
*
|
|
* @example Usage
|
|
* ```ts
|
|
* import { assertSnapshot } from "@std/testing/snapshot";
|
|
*
|
|
* Deno.test("snapshot", async (t) => {
|
|
* await assertSnapshot<number>(t, 2);
|
|
* });
|
|
* ```
|
|
*
|
|
* @typeParam T The type of the snapshot
|
|
* @param context The test context
|
|
* @param actual The actual value to compare
|
|
* @param message The optional assertion messagge
|
|
*/
|
|
export async function assertSnapshot<T>(
|
|
context: Deno.TestContext,
|
|
actual: T,
|
|
message?: string,
|
|
): Promise<void>;
|
|
export async function assertSnapshot(
|
|
context: Deno.TestContext,
|
|
actual: unknown,
|
|
msgOrOpts?: string | SnapshotOptions<unknown>,
|
|
) {
|
|
const options = getOptions();
|
|
const assertSnapshotContext = AssertSnapshotContext.fromOptions(
|
|
context,
|
|
options,
|
|
);
|
|
const testName = getTestName(context, options);
|
|
const count = assertSnapshotContext.getCount(testName);
|
|
const name = `${testName} ${count}`;
|
|
const snapshot = await assertSnapshotContext.getSnapshot(
|
|
name,
|
|
options,
|
|
);
|
|
|
|
assertSnapshotContext.pushSnapshotToUpdateQueue(name);
|
|
const _serialize = options.serializer || serialize;
|
|
const _actual = _serialize(actual);
|
|
if (getIsUpdate(options)) {
|
|
assertSnapshotContext.registerTeardown();
|
|
if (!equal(_actual, snapshot)) {
|
|
assertSnapshotContext.updateSnapshot(name, _actual);
|
|
}
|
|
} else {
|
|
if (
|
|
!assertSnapshotContext.hasSnapshot(name) ||
|
|
typeof snapshot === "undefined"
|
|
) {
|
|
throw new AssertionError(
|
|
getErrorMessage(`Missing snapshot: ${name}`, options),
|
|
);
|
|
}
|
|
if (equal(_actual, snapshot)) {
|
|
return;
|
|
}
|
|
const stringDiff = !_actual.includes("\n");
|
|
const diffResult = stringDiff
|
|
? diffStr(_actual, snapshot)
|
|
: diff(_actual.split("\n"), snapshot.split("\n"));
|
|
const diffMsg = buildMessage(diffResult, { stringDiff }).join("\n");
|
|
const message = `Snapshot does not match:\n${diffMsg}`;
|
|
throw new AssertionError(
|
|
getErrorMessage(message, options),
|
|
);
|
|
}
|
|
|
|
function getOptions(): SnapshotOptions {
|
|
if (typeof msgOrOpts === "object" && msgOrOpts !== null) {
|
|
return msgOrOpts;
|
|
}
|
|
|
|
return {
|
|
msg: msgOrOpts,
|
|
};
|
|
}
|
|
function getTestName(
|
|
context: Deno.TestContext,
|
|
options?: SnapshotOptions,
|
|
): string {
|
|
if (options && options.name) {
|
|
return options.name;
|
|
} else if (context.parent) {
|
|
return `${getTestName(context.parent)} > ${context.name}`;
|
|
}
|
|
return context.name;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create {@linkcode assertSnapshot} function with the given options.
|
|
*
|
|
* The specified option becomes the default for returned {@linkcode assertSnapshot}
|
|
*
|
|
* @example Usage
|
|
* ```ts
|
|
* import { createAssertSnapshot } from "@std/testing/snapshot";
|
|
*
|
|
* const assertSnapshot = createAssertSnapshot({
|
|
* // Uses the custom directory for saving snapshot files.
|
|
* dir: "my_snapshot_dir",
|
|
* });
|
|
*
|
|
* Deno.test("a snapshot test case", async (t) => {
|
|
* await assertSnapshot(t, {
|
|
* foo: "Hello",
|
|
* bar: "World",
|
|
* });
|
|
* })
|
|
* ```
|
|
*
|
|
* @typeParam T The type of the snapshot
|
|
* @param options The options
|
|
* @param baseAssertSnapshot {@linkcode assertSnapshot} function implementation. Default to the original {@linkcode assertSnapshot}
|
|
* @returns {@linkcode assertSnapshot} function with the given default options.
|
|
*/
|
|
export function createAssertSnapshot<T>(
|
|
options: SnapshotOptions<T>,
|
|
baseAssertSnapshot: typeof assertSnapshot = assertSnapshot,
|
|
): typeof assertSnapshot {
|
|
return async function _assertSnapshot(
|
|
context: Deno.TestContext,
|
|
actual: T,
|
|
messageOrOptions?: string | SnapshotOptions<T>,
|
|
) {
|
|
const mergedOptions: SnapshotOptions<T> = {
|
|
...options,
|
|
...(typeof messageOrOptions === "string"
|
|
? {
|
|
msg: messageOrOptions,
|
|
}
|
|
: messageOrOptions),
|
|
};
|
|
|
|
await baseAssertSnapshot(context, actual, mergedOptions);
|
|
};
|
|
}
|