feat(Deno.inspect): Add sorted, trailingComma, compact and iterableLimit to InspectOptions (denoland/deno#6591)

README.md

@@ -30,7 +30,10 @@ Don't link to / import any module whose path:
 - Is that of a test module or test data: `test.ts`, `foo_test.ts`,
   `testdata/bar.txt`.
 
-No stability is guaranteed for these files.
+Don't import any symbol with an underscore prefix: `export function _baz() {}`.
+
+These elements are not considered part of the public API, thus no stability is
+guaranteed for them.
 
 ## Documentation
 
@@ -38,7 +41,7 @@ To browse documentation for modules:
 
 - Go to https://deno.land/std/.
 - Navigate to any module of interest.
-- Click the "DOCUMENTATION" link.
+- Click "View Documentation".
 
 ## Contributing
 

testing/asserts.ts

@@ -19,8 +19,16 @@ export class AssertionError extends Error {
   }
 }
 
-function format(v: unknown): string {
-  let string = globalThis.Deno ? Deno.inspect(v) : String(v);
+export function _format(v: unknown): string {
+  let string = globalThis.Deno
+    ? Deno.inspect(v, {
+        depth: Infinity,
+        sorted: true,
+        trailingComma: true,
+        compact: false,
+        iterableLimit: Infinity,
+      })
+    : String(v);
   if (typeof v == "string") {
     string = `"${string.replace(/(?=["\\])/g, "\\")}"`;
   }
@@ -167,8 +175,8 @@ export function assertEquals(
     return;
   }
   let message = "";
-  const actualString = format(actual);
-  const expectedString = format(expected);
+  const actualString = _format(actual);
+  const expectedString = _format(expected);
   try {
     const diffResult = diff(
       actualString.split("\n"),
@@ -248,13 +256,13 @@ export function assertStrictEquals<T>(
   if (msg) {
     message = msg;
   } else {
-    const actualString = format(actual);
-    const expectedString = format(expected);
+    const actualString = _format(actual);
+    const expectedString = _format(expected);
 
     if (actualString === expectedString) {
       const withOffset = actualString
         .split("\n")
-        .map((l) => `     ${l}`)
+        .map((l) => `    ${l}`)
         .join("\n");
       message = `Values have the same structure but are not reference-equal:\n\n${red(
         withOffset
@@ -335,9 +343,9 @@ export function assertArrayContains(
     return;
   }
   if (!msg) {
-    msg = `actual: "${format(actual)}" expected to contain: "${format(
+    msg = `actual: "${_format(actual)}" expected to contain: "${_format(
       expected
-    )}"\nmissing: ${format(missing)}`;
+    )}"\nmissing: ${_format(missing)}`;
   }
   throw new AssertionError(msg);
 }

testing/asserts_test.ts

@@ -1,5 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import {
+  _format,
   assert,
   assertNotEquals,
   assertStringContains,
@@ -15,7 +16,7 @@ import {
   unimplemented,
   unreachable,
 } from "./asserts.ts";
-import { red, green, gray, bold, yellow } from "../fmt/colors.ts";
+import { red, green, gray, bold, yellow, stripColor } from "../fmt/colors.ts";
 
 Deno.test("testingEqual", function (): void {
   assert(equal("world", "world"));
@@ -176,7 +177,23 @@ Deno.test("testingArrayContains", function (): void {
   assertThrows(
     (): void => assertArrayContains(fixtureObject, [{ deno: "node" }]),
     AssertionError,
-    `actual: "[ { deno: "luv" }, { deno: "Js" } ]" expected to contain: "[ { deno: "node" } ]"\nmissing: [ { deno: "node" } ]`
+    `actual: "[
+  {
+    deno: "luv",
+  },
+  {
+    deno: "Js",
+  },
+]" expected to contain: "[
+  {
+    deno: "node",
+  },
+]"
+missing: [
+  {
+    deno: "node",
+  },
+]`
   );
 });
 
@@ -342,13 +359,13 @@ Deno.test({
     assertThrows(
       (): void => assertEquals([1, "2", 3], ["1", "2", 3]),
       AssertionError,
-      [
-        "Values are not equal:",
-        ...createHeader(),
-        removed(`-   [ ${yellow("1")}, ${green('"2"')}, ${yellow("3")} ]`),
-        added(`+   [ ${green('"1"')}, ${green('"2"')}, ${yellow("3")} ]`),
-        "",
-      ].join("\n")
+      `
+    [
+-     1,
++     "1",
+      "2",
+      3,
+    ]`
     );
   },
 });
@@ -359,17 +376,16 @@ Deno.test({
     assertThrows(
       (): void => assertEquals({ a: 1, b: "2", c: 3 }, { a: 1, b: 2, c: [3] }),
       AssertionError,
-      [
-        "Values are not equal:",
-        ...createHeader(),
-        removed(
-          `-   { a: ${yellow("1")}, b: ${green('"2"')}, c: ${yellow("3")} }`
-        ),
-        added(
-          `+   { a: ${yellow("1")}, b: ${yellow("2")}, c: [ ${yellow("3")} ] }`
-        ),
-        "",
-      ].join("\n")
+      `
+    {
+      a: 1,
++     b: 2,
++     c: [
++       3,
++     ],
+-     b: "2",
+-     c: 3,
+    }`
     );
   },
 });
@@ -418,13 +434,14 @@ Deno.test({
     assertThrows(
       (): void => assertStrictEquals({ a: 1, b: 2 }, { a: 1, c: [3] }),
       AssertionError,
-      [
-        "Values are not strictly equal:",
-        ...createHeader(),
-        removed(`-   { a: ${yellow("1")}, b: ${yellow("2")} }`),
-        added(`+   { a: ${yellow("1")}, c: [ ${yellow("3")} ] }`),
-        "",
-      ].join("\n")
+      `
+    {
+      a: 1,
++     c: [
++       3,
++     ],
+-     b: 2,
+    }`
     );
   },
 });
@@ -435,10 +452,12 @@ Deno.test({
     assertThrows(
       (): void => assertStrictEquals({ a: 1, b: 2 }, { a: 1, b: 2 }),
       AssertionError,
-      [
-        "Values have the same structure but are not reference-equal:\n",
-        red(`     { a: ${yellow("1")}, b: ${yellow("2")} }`),
-      ].join("\n")
+      `Values have the same structure but are not reference-equal:
+
+    {
+      a: 1,
+      b: 2,
+    }`
     );
   },
 });
@@ -535,3 +554,75 @@ Deno.test("Assert Throws Async Non-Error Fail", () => {
     "A non-Error object was thrown or rejected."
   );
 });
+
+Deno.test("assertEquals diff for differently ordered objects", () => {
+  assertThrows(
+    () => {
+      assertEquals(
+        {
+          aaaaaaaaaaaaaaaaaaaaaaaa: 0,
+          bbbbbbbbbbbbbbbbbbbbbbbb: 0,
+          ccccccccccccccccccccccc: 0,
+        },
+        {
+          ccccccccccccccccccccccc: 1,
+          aaaaaaaaaaaaaaaaaaaaaaaa: 0,
+          bbbbbbbbbbbbbbbbbbbbbbbb: 0,
+        }
+      );
+    },
+    AssertionError,
+    `
+    {
+      aaaaaaaaaaaaaaaaaaaaaaaa: 0,
+      bbbbbbbbbbbbbbbbbbbbbbbb: 0,
+-     ccccccccccccccccccccccc: 0,
++     ccccccccccccccccccccccc: 1,
+    }`
+  );
+});
+
+// Check that the diff formatter overrides some default behaviours of
+// `Deno.inspect()` which are problematic for diffing.
+Deno.test("assert diff formatting", () => {
+  // Wraps objects into multiple lines even when they are small. Prints trailing
+  // commas.
+  assertEquals(
+    stripColor(_format({ a: 1, b: 2 })),
+    `{
+  a: 1,
+  b: 2,
+}`
+  );
+
+  // Same for nested small objects.
+  assertEquals(
+    stripColor(_format([{ x: { a: 1, b: 2 }, y: ["a", "b"] }])),
+    `[
+  {
+    x: {
+      a: 1,
+      b: 2,
+    },
+    y: [
+      "a",
+      "b",
+    ],
+  },
+]`
+  );
+
+  // Grouping is disabled.
+  assertEquals(
+    stripColor(_format(["i", "i", "i", "i", "i", "i", "i"])),
+    `[
+  "i",
+  "i",
+  "i",
+  "i",
+  "i",
+  "i",
+  "i",
+]`
+  );
+});