Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

23 files changed, 786 insertions, 0 deletions

diff --git a/devtools/client/shared/source-map-loader/test/browser/browser.toml b/devtools/client/shared/source-map-loader/test/browser/browser.toml
new file mode 100644
index 0000000000..5a602e9eeb
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/browser.toml
@@ -0,0 +1,21 @@
+[DEFAULT]
+tags = "devtools"
+subsuite = "devtools"
+support-files = [
+  "head.js",
+  "fixtures/*",
+  "!/devtools/client/shared/test/shared-head.js",
+  "!/devtools/client/shared/test/telemetry-test-helpers.js",
+]
+
+["browser_getContentType.js"]
+
+["browser_locations.js"]
+
+["browser_source-map.js"]
+
+["browser_wasm-source-map.js"]
+skip-if = [
+  "http3", # Bug 1829298
+  "http2",
+]
diff --git a/devtools/client/shared/source-map-loader/test/browser/browser_getContentType.js b/devtools/client/shared/source-map-loader/test/browser/browser_getContentType.js
new file mode 100644
index 0000000000..5ac402951c
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/browser_getContentType.js
@@ -0,0 +1,32 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Cover the automatic mapping of content type based on file extension
+
+const {
+  getContentType,
+  contentMapForTesting,
+} = require("resource://devtools/client/shared/source-map-loader/utils/index.js");
+
+add_task(async () => {
+  for (const ext in contentMapForTesting) {
+    is(
+      getContentType(`whatever.${ext}`),
+      contentMapForTesting[ext],
+      `${ext} file extension is correctly mapping the expected content type`
+    );
+  }
+  is(
+    getContentType(`whateverjs`),
+    "text/plain",
+    `A valid extension in file name doesn't cause a special content type mapping`
+  );
+
+  is(
+    getContentType("whatever.platypus"),
+    "text/plain",
+    "Test unknown extension defaults to text plain"
+  );
+});
diff --git a/devtools/client/shared/source-map-loader/test/browser/browser_locations.js b/devtools/client/shared/source-map-loader/test/browser/browser_locations.js
new file mode 100644
index 0000000000..4d43df5902
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/browser_locations.js
@@ -0,0 +1,141 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Covert getOriginalLocation and getGeneratedLocation functions.
+
+add_task(async function testGetOriginalLocation() {
+  await fetchFixtureSourceMap("bundle");
+
+  const generatedLocation = {
+    sourceId: "bundle.js",
+    line: 49,
+  };
+
+  const originalLocation = await gSourceMapLoader.getOriginalLocation(
+    generatedLocation
+  );
+  Assert.deepEqual(
+    originalLocation,
+    {
+      column: 0,
+      line: 3,
+      sourceId: "bundle.js/originalSource-fe2c41d3535b76c158e39ba4f3ff826a",
+      sourceUrl: "webpack:///entry.js",
+    },
+    "Mapped a generated location"
+  );
+
+  const originalLocation2 = await gSourceMapLoader.getOriginalLocation(
+    originalLocation
+  );
+  Assert.deepEqual(originalLocation2, null, "No mapped location");
+
+  gSourceMapLoader.clearSourceMaps();
+  const originalLocation3 = await gSourceMapLoader.getOriginalLocation(
+    generatedLocation
+  );
+  Assert.deepEqual(
+    originalLocation3,
+    null,
+    "after clearing the source maps, the same generated location no longer maps"
+  );
+});
+
+add_task(async function testGetGeneratedLocation() {
+  await fetchFixtureSourceMap("bundle");
+
+  const originalLocation = {
+    column: 0,
+    line: 3,
+    sourceId: "bundle.js/originalSource-fe2c41d3535b76c158e39ba4f3ff826a",
+  };
+
+  const source = {
+    url: "webpack:///entry.js",
+    id: "bundle.js/originalSource-fe2c41d3535b76c158e39ba4f3ff826a",
+  };
+
+  const generatedLocation = await gSourceMapLoader.getGeneratedLocation(
+    originalLocation,
+    source
+  );
+  Assert.deepEqual(
+    generatedLocation,
+    {
+      sourceId: "bundle.js",
+      line: 49,
+      column: 0,
+    },
+    "Map an original location"
+  );
+
+  {
+    gSourceMapLoader.clearSourceMaps();
+
+    const secondGeneratedLocation = await gSourceMapLoader.getGeneratedLocation(
+      originalLocation,
+      source
+    );
+    Assert.deepEqual(
+      secondGeneratedLocation,
+      null,
+      "after clearing source maps, the same location no longer maps to an original location"
+    );
+  }
+
+  {
+    // we expect symmetric mappings, which means that if
+    // we map a generated location to an original location,
+    // and then map it back, we should get the original generated value.
+    // e.g. G[8, 0] -> O[5, 4] -> G[8, 0]
+    await fetchFixtureSourceMap("if.out");
+
+    const genLoc1 = {
+      sourceId: "if.out.js",
+      column: 0,
+      line: 8,
+    };
+
+    const ifSource = {
+      url: "if.js",
+      id: "if.out.js/originalSource-5ad3141023dae912c5f8833c7e03beeb",
+    };
+
+    const oLoc = await gSourceMapLoader.getOriginalLocation(genLoc1);
+    const genLoc2 = await gSourceMapLoader.getGeneratedLocation(oLoc, ifSource);
+
+    Assert.deepEqual(genLoc2, genLoc1, "location mapping is symmetric");
+  }
+
+  {
+    // we expect that an undefined column will be handled like a
+    // location w/ column 0. e.g. G[8, u] -> O[5, 4] -> G[8, 0]
+    await fetchFixtureSourceMap("if.out");
+
+    const genLoc1 = {
+      sourceId: "if.out.js",
+      column: undefined,
+      line: 8,
+    };
+
+    const ifSource = {
+      url: "if.js",
+      id: "if.out.js/originalSource-5ad3141023dae912c5f8833c7e03beeb",
+    };
+
+    const oLoc = await gSourceMapLoader.getOriginalLocation(genLoc1);
+    const genLoc2 = await gSourceMapLoader.getGeneratedLocation(oLoc, ifSource);
+
+    Assert.deepEqual(
+      genLoc2,
+      {
+        sourceId: "if.out.js",
+        column: 0,
+        line: 8,
+      },
+      "undefined column is handled like 0 column"
+    );
+  }
+});
diff --git a/devtools/client/shared/source-map-loader/test/browser/browser_source-map.js b/devtools/client/shared/source-map-loader/test/browser/browser_source-map.js
new file mode 100644
index 0000000000..34d4fedf27
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/browser_source-map.js
@@ -0,0 +1,163 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Cover the high level API of these modules:
+// getOriginalURLs getGeneratedRangesForOriginal functions
+
+async function assertFixtureOriginalURLs(
+  fixtureName,
+  expectedUrls,
+  testMessage
+) {
+  const originalSources = await fetchFixtureSourceMap(fixtureName);
+  const urls = originalSources.map(s => s.url);
+  Assert.deepEqual(urls, expectedUrls, testMessage);
+}
+
+add_task(async function testGetOriginalURLs() {
+  await assertFixtureOriginalURLs(
+    "absolute",
+    ["https://example.com/cheese/heart.js"],
+    "Test absolute URL"
+  );
+
+  await assertFixtureOriginalURLs(
+    "bundle",
+    [
+      "webpack:///webpack/bootstrap%204ef8c7ec7c1df790781e",
+      "webpack:///entry.js",
+      "webpack:///times2.js",
+      "webpack:///output.js",
+      "webpack:///opts.js",
+    ],
+    "Test source with a url"
+  );
+
+  await assertFixtureOriginalURLs(
+    "empty",
+    [`${URL_ROOT_SSL}fixtures/heart.js`],
+    "Test empty sourceRoot resolution"
+  );
+
+  await assertFixtureOriginalURLs(
+    "noroot",
+    [`${URL_ROOT_SSL}fixtures/heart.js`],
+    "Test Non-existing sourceRoot resolution"
+  );
+
+  await assertFixtureOriginalURLs(
+    "noroot2",
+    [`${URL_ROOT_SSL}fixtures/heart.js`],
+    "Test Non-existing sourceRoot resolution with relative URLs"
+  );
+});
+
+add_task(async function testGetGeneratedRangesForOriginal() {
+  const originals = await fetchFixtureSourceMap("intermingled-sources");
+
+  const ranges = await gSourceMapLoader.getGeneratedRangesForOriginal(
+    originals[0].id
+  );
+
+  Assert.deepEqual(
+    ranges,
+    [
+      {
+        start: {
+          line: 4,
+          column: 69,
+        },
+        end: {
+          line: 9,
+          column: Infinity,
+        },
+      },
+      {
+        start: {
+          line: 11,
+          column: 0,
+        },
+        end: {
+          line: 17,
+          column: 3,
+        },
+      },
+      {
+        start: {
+          line: 19,
+          column: 18,
+        },
+        end: {
+          line: 19,
+          column: 22,
+        },
+      },
+      {
+        start: {
+          line: 26,
+          column: 0,
+        },
+        end: {
+          line: 26,
+          column: Infinity,
+        },
+      },
+      {
+        start: {
+          line: 28,
+          column: 0,
+        },
+        end: {
+          line: 28,
+          column: Infinity,
+        },
+      },
+    ],
+    "Test the overall generated ranges on the source"
+  );
+
+  {
+    // Note that we have to clear the source map in order to get the merged ranges,
+    // otherwise we are still fetching the previous unmerged ones!
+    const secondOriginals = await fetchFixtureSourceMap("intermingled-sources");
+    const mergedRanges = await gSourceMapLoader.getGeneratedRangesForOriginal(
+      secondOriginals[0].id,
+      true
+    );
+
+    Assert.deepEqual(
+      mergedRanges,
+      [
+        {
+          start: {
+            line: 4,
+            column: 69,
+          },
+          end: {
+            line: 28,
+            column: Infinity,
+          },
+        },
+      ],
+      "Test the merged generated ranges on the source"
+    );
+  }
+});
+
+add_task(async function testBaseURLErrorHandling() {
+  const source = {
+    id: "missingmap.js",
+    sourceMapURL: "missingmap.js.map",
+    // Notice the duplicated ":" which cause the error here
+    sourceMapBaseURL: "http:://example.com/",
+  };
+
+  try {
+    await gSourceMapLoader.getOriginalURLs(source);
+    ok(false, "Should throw");
+  } catch (e) {
+    is(e.message, "URL constructor: http:://example.com/ is not a valid URL.");
+  }
+});
diff --git a/devtools/client/shared/source-map-loader/test/browser/browser_wasm-source-map.js b/devtools/client/shared/source-map-loader/test/browser/browser_wasm-source-map.js
new file mode 100644
index 0000000000..0f69d7b038
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/browser_wasm-source-map.js
@@ -0,0 +1,126 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test source mappings WASM sources.
+// This test is quite general and test various functions.
+
+const {
+  WasmRemap,
+} = require("resource://devtools/client/shared/source-map-loader/utils/wasmRemap.js");
+const {
+  SourceMapConsumer,
+} = require("resource://devtools/client/shared/vendor/source-map/source-map.js");
+
+SourceMapConsumer.initialize({
+  "lib/mappings.wasm":
+    "resource://devtools/client/shared/vendor/source-map/lib/mappings.wasm",
+});
+
+add_task(async function smokeTest() {
+  const testMap1 = {
+    version: 3,
+    file: "min.js",
+    names: [],
+    sources: ["one.js", "two.js"],
+    sourceRoot: "/the/root",
+    mappings: "CAAC,IAAM,SACU,GAAC",
+  };
+  const testMap1Entries = [
+    { offset: 1, line: 1, column: 1 },
+    { offset: 5, line: 1, column: 7 },
+    { offset: 14, line: 2, column: 17 },
+    { offset: 17, line: 2, column: 18 },
+  ];
+
+  const map1 = await new SourceMapConsumer(testMap1);
+
+  const remap1 = new WasmRemap(map1);
+
+  is(remap1.file, "min.js");
+  is(remap1.hasContentsOfAllSources(), false);
+  is(remap1.sources.length, 2);
+  is(remap1.sources[0], "/the/root/one.js");
+  is(remap1.sources[1], "/the/root/two.js");
+
+  const expectedEntries = testMap1Entries.slice(0);
+  remap1.eachMapping(function (entry) {
+    const expected = expectedEntries.shift();
+    is(entry.generatedLine, expected.offset);
+    is(entry.generatedColumn, 0);
+    is(entry.originalLine, expected.line);
+    is(entry.originalColumn, expected.column);
+    is(entry.name, null);
+  });
+
+  const pos1 = remap1.originalPositionFor({ line: 5, column: 0 });
+  is(pos1.line, 1);
+  is(pos1.column, 7);
+  is(pos1.source, "/the/root/one.js");
+
+  const pos2 = remap1.generatedPositionFor({
+    source: "/the/root/one.js",
+    line: 2,
+    column: 18,
+  });
+  is(pos2.line, 17);
+  is(pos2.column, 0);
+  is(pos2.lastColumn, undefined);
+
+  remap1.computeColumnSpans();
+  const pos3 = remap1.allGeneratedPositionsFor({
+    source: "/the/root/one.js",
+    line: 2,
+    column: 17,
+  });
+  is(pos3.length, 1);
+  is(pos3[0].line, 14);
+  is(pos3[0].column, 0);
+  is(pos3[0].lastColumn, 0);
+
+  map1.destroy();
+});
+
+add_task(async function contentPresents() {
+  const testMap2 = {
+    version: 3,
+    file: "none.js",
+    names: [],
+    sources: ["zero.js"],
+    mappings: "",
+    sourcesContent: ["//test"],
+  };
+
+  const map2 = await new SourceMapConsumer(testMap2);
+  const remap2 = new WasmRemap(map2);
+  is(remap2.file, "none.js");
+  ok(remap2.hasContentsOfAllSources());
+  is(remap2.sourceContentFor("zero.js"), "//test");
+
+  map2.destroy();
+});
+
+add_task(async function readAndTransposeWasmMap() {
+  const source = {
+    id: "wasm.js",
+    sourceMapBaseURL: "wasm:http://example.com/whatever/:min.js",
+    sourceMapURL: `${URL_ROOT}fixtures/wasm.js.map`,
+    isWasm: true,
+  };
+
+  const urls = await gSourceMapLoader.getOriginalURLs(source);
+  Assert.deepEqual(urls, [
+    {
+      id: "wasm.js/originalSource-63954a1c231200652c0d99c6a69cd178",
+      url: `${URL_ROOT}fixtures/one.js`,
+    },
+  ]);
+
+  const { line, column } = await gSourceMapLoader.getOriginalLocation({
+    sourceId: source.id,
+    line: 5,
+  });
+  is(line, 1);
+  is(column, 7);
+});
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/absolute.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/absolute.js
new file mode 100644
index 0000000000..adcc337eca
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/absolute.js
@@ -0,0 +1,2 @@
+/* Doesn't really matter what is in here.  */
+// # sourceMappingURL=absolute.js.map
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/absolute.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/absolute.js.map
new file mode 100644
index 0000000000..0597515870
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/absolute.js.map
@@ -0,0 +1,10 @@
+{
+  "version": 3,
+  "sources": [
+    "heart.js"
+  ],
+  "names": [],
+  "mappings": ";AAAA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA,uBAAe;AACf;AACA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;;AAGA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;;;;;;;ACtCA;AACA,QAAO,SAAS;AAChB;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA;AACA;AACA;;;;;;;ACfA;AACA;AACA;;;;;;;ACFA;AACA;AACA;;AAEA,mBAAkB;;;;;;;ACJlB;AACA;AACA",
+  "file": "absolute.js",
+  "sourceRoot": "https://example.com/cheese/"
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/bundle.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/bundle.js
new file mode 100644
index 0000000000..9ee477b856
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/bundle.js
@@ -0,0 +1,94 @@
+/** ****/ (function(modules) { // webpackBootstrap
+/** ****/ 	// The module cache
+/** ****/ 	  var installedModules = {};
+/** ****/
+/** ****/ 	// The require function
+/** ****/ 	  function __webpack_require__(moduleId) {
+/** ****/
+/** ****/ 		// Check if module is in cache
+/** ****/ 		  if (installedModules[moduleId])
+/** ****/ 			{return installedModules[moduleId].exports;}
+/** ****/
+/** ****/ 		// Create a new module (and put it into the cache)
+/** ****/ 		  var module = installedModules[moduleId] = {
+/** ****/ 			  exports: {},
+/** ****/ 			  id: moduleId,
+/** ****/ 			  loaded: false
+/** ****/ 		};
+/** ****/
+/** ****/ 		// Execute the module function
+/** ****/ 		  modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
+/** ****/
+/** ****/ 		// Flag the module as loaded
+/** ****/ 		  module.loaded = true;
+/** ****/
+/** ****/ 		// Return the exports of the module
+/** ****/ 		  return module.exports;
+/** ****/ 	}
+/** ****/
+/** ****/
+/** ****/ 	// expose the modules object (__webpack_modules__)
+/** ****/ 	  __webpack_require__.m = modules;
+/** ****/
+/** ****/ 	// expose the module cache
+/** ****/ 	  __webpack_require__.c = installedModules;
+/** ****/
+/** ****/ 	// __webpack_public_path__
+/** ****/ 	  __webpack_require__.p = "";
+/** ****/
+/** ****/ 	// Load entry module and return exports
+/** ****/ 	  return __webpack_require__(0);
+/** ****/ })([
+/* 0 */
+/** */   function(module, exports, __webpack_require__) {
+
+  const times2 = __webpack_require__(1);
+  const { output } = __webpack_require__(2);
+  const opts = __webpack_require__(3);
+
+  output(times2(1));
+  output(times2(2));
+
+  if (opts.extra) {
+	  output(times2(3));
+}
+
+  window.keepMeAlive = function() {
+	  // This function exists to make sure this script is never garbage
+	  // collected. It is also callable from tests.
+	  return times2(4);
+};
+
+/** *
+/ },
+/* 1 */
+/** */   function(module, exports) {
+
+  module.exports = function(x) {
+	  return x * 2;
+};
+
+/** *
+/ },
+/* 2 */
+/** */   function(module, exports) {
+
+  function output(str) {
+	  console.log(str);
+}
+
+  module.exports = { output };
+
+/** *
+/ },
+/* 3 */
+/** */   function(module, exports) {
+
+  module.exports = {
+	  extra: true
+};
+
+/** *
+/ }
+/** ****/ ]);
+// # sourceMappingURL=bundle.js.map
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/bundle.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/bundle.js.map
new file mode 100644
index 0000000000..f53036cb8e
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/bundle.js.map
@@ -0,0 +1,21 @@
+{
+  "version": 3,
+  "sources": [
+    "webpack:///webpack/bootstrap 4ef8c7ec7c1df790781e",
+    "webpack:///./entry.js",
+    "webpack:///./times2.js",
+    "webpack:///./output.js",
+    "webpack:///./opts.js"
+  ],
+  "names": [],
+  "mappings": ";AAAA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA,uBAAe;AACf;AACA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;;AAGA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;;;;;;;ACtCA;AACA,QAAO,SAAS;AAChB;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA;AACA;AACA;;;;;;;ACfA;AACA;AACA;;;;;;;ACFA;AACA;AACA;;AAEA,mBAAkB;;;;;;;ACJlB;AACA;AACA",
+  "file": "bundle.js",
+  "sourcesContent": [
+    " \t// The module cache\n \tvar installedModules = {};\n\n \t// The require function\n \tfunction __webpack_require__(moduleId) {\n\n \t\t// Check if module is in cache\n \t\tif(installedModules[moduleId])\n \t\t\treturn installedModules[moduleId].exports;\n\n \t\t// Create a new module (and put it into the cache)\n \t\tvar module = installedModules[moduleId] = {\n \t\t\texports: {},\n \t\t\tid: moduleId,\n \t\t\tloaded: false\n \t\t};\n\n \t\t// Execute the module function\n \t\tmodules[moduleId].call(module.exports, module, module.exports, __webpack_require__);\n\n \t\t// Flag the module as loaded\n \t\tmodule.loaded = true;\n\n \t\t// Return the exports of the module\n \t\treturn module.exports;\n \t}\n\n\n \t// expose the modules object (__webpack_modules__)\n \t__webpack_require__.m = modules;\n\n \t// expose the module cache\n \t__webpack_require__.c = installedModules;\n\n \t// __webpack_public_path__\n \t__webpack_require__.p = \"\";\n\n \t// Load entry module and return exports\n \treturn __webpack_require__(0);\n\n\n\n// WEBPACK FOOTER //\n// webpack/bootstrap 4ef8c7ec7c1df790781e",
+    "const times2 = require(\"./times2\");\nconst { output } = require(\"./output\");\nconst opts = require(\"./opts\");\n\noutput(times2(1));\noutput(times2(2));\n\nif(opts.extra) {\n  output(times2(3));\n}\n\nwindow.keepMeAlive = function() {\n  // This function exists to make sure this script is never garbage\n  // collected. It is also callable from tests.\n  return times2(4);\n}\n\n\n\n//////////////////\n// WEBPACK FOOTER\n// ./entry.js\n// module id = 0\n// module chunks = 0",
+    "module.exports = function(x) {\n  return x * 2;\n}\n\n\n\n//////////////////\n// WEBPACK FOOTER\n// ./times2.js\n// module id = 1\n// module chunks = 0",
+    "function output(str) {\n  console.log(str);\n}\n\nmodule.exports = { output };\n\n\n\n//////////////////\n// WEBPACK FOOTER\n// ./output.js\n// module id = 2\n// module chunks = 0",
+    "module.exports = {\n  extra: true\n};\n\n\n\n//////////////////\n// WEBPACK FOOTER\n// ./opts.js\n// module id = 3\n// module chunks = 0"
+  ],
+  "sourceRoot": ""
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/empty.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/empty.js
new file mode 100644
index 0000000000..72c472a745
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/empty.js
@@ -0,0 +1,2 @@
+/* Doesn't really matter what is in here.  */
+// # sourceMappingURL=empty.js.map
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/empty.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/empty.js.map
new file mode 100644
index 0000000000..9ebfec598d
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/empty.js.map
@@ -0,0 +1,10 @@
+{
+  "version": 3,
+  "sources": [
+    "heart.js"
+  ],
+  "names": [],
+  "mappings": ";AAAA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA,uBAAe;AACf;AACA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;;AAGA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;;;;;;;ACtCA;AACA,QAAO,SAAS;AAChB;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA;AACA;AACA;;;;;;;ACfA;AACA;AACA;;;;;;;ACFA;AACA;AACA;;AAEA,mBAAkB;;;;;;;ACJlB;AACA;AACA",
+  "file": "empty.js",
+  "sourceRoot": ""
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/if.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/if.js
new file mode 100644
index 0000000000..4ee69b19ef
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/if.js
@@ -0,0 +1,12 @@
+function componentWillReceiveProps(nextProps) {
+  console.log("start");
+  const { selectedSource } = nextProps;
+
+  if (
+    nextProps.startPanelSize !== this.props.startPanelSize ||
+    nextProps.endPanelSize !== this.props.endPanelSize
+  ) {
+    this.state.editor.codeMirror.setSize();
+  }
+  console.log("done");
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/if.out.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/if.out.js
new file mode 100644
index 0000000000..9bb0752a92
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/if.out.js
@@ -0,0 +1,16 @@
+"use strict";
+
+function componentWillReceiveProps(nextProps) {
+  console.log("start");
+  var selectedSource = nextProps.selectedSource;
+
+  if (
+    nextProps.startPanelSize !== this.props.startPanelSize ||
+    nextProps.endPanelSize !== this.props.endPanelSize
+  ) {
+    this.state.editor.codeMirror.setSize();
+  }
+  console.log("done");
+}
+
+//# sourceMappingURL=if.out.js.map
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/if.out.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/if.out.js.map
new file mode 100644
index 0000000000..27feb5278f
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/if.out.js.map
@@ -0,0 +1,7 @@
+{
+    "version":3,
+    "sources":["if.js"],
+    "names":[],
+    "mappings":";;AAAA,SAAS,yBAAT,CAAmC,SAAnC,EAA8C;AAC7C,UAAQ,GAAR,CAAY,OAAZ;AAD6C,MAElC,cAFkC,GAEf,SAFe,CAElC,cAFkC;;;AAI1C,MACE,UAAU,cAAV,KAA6B,KAAK,KAAL,CAAW,cAAxC,IACA,UAAU,YAAV,KAA2B,KAAK,KAAL,CAAW,YAFxC,EAGE;AACA,SAAK,KAAL,CAAW,MAAX,CAAkB,UAAlB,CAA6B,OAA7B;AACD;AACJ,UAAQ,GAAR,CAAY,MAAZ;AACA","file":"if.out.js",
+    "sourcesContent":["function componentWillReceiveProps(nextProps) {\n\tconsole.log('start');\n    const { selectedSource } = nextProps;\n\n    if (\n      nextProps.startPanelSize !== this.props.startPanelSize ||\n      nextProps.endPanelSize !== this.props.endPanelSize\n    ) {\n      this.state.editor.codeMirror.setSize();\n    }\n\tconsole.log('done');\n}\n"]
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/intermingled-sources.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/intermingled-sources.js
new file mode 100644
index 0000000000..c3d9a150bd
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/intermingled-sources.js
@@ -0,0 +1,62 @@
+"use strict";
+
+var decl = (function() {
+  var _ref = _asyncToGenerator(
+    /*#__PURE__*/ regeneratorRuntime.mark(function _callee() {
+      return regeneratorRuntime.wrap(
+        function _callee$(_context) {
+          while (1) {
+            switch ((_context.prev = _context.next)) {
+              case 0:
+                console.log("2");
+
+              case 1:
+              case "end":
+                return _context.stop();
+            }
+          }
+        },
+        _callee,
+        this
+      );
+    })
+  );
+
+  return function decl() {
+    return _ref.apply(this, arguments);
+  };
+})();
+
+function _asyncToGenerator(fn) {
+  return function() {
+    var gen = fn.apply(this, arguments);
+    return new Promise(function(resolve, reject) {
+      function step(key, arg) {
+        try {
+          var info = gen[key](arg);
+          var value = info.value;
+        } catch (error) {
+          reject(error);
+          return;
+        }
+        if (info.done) {
+          resolve(value);
+        } else {
+          return Promise.resolve(value).then(
+            function(value) {
+              step("next", value);
+            },
+            function(err) {
+              step("throw", err);
+            }
+          );
+        }
+      }
+      return step("next");
+    });
+  };
+}
+
+console.log("1");
+
+console.log("3");
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/intermingled-sources.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/intermingled-sources.js.map
new file mode 100644
index 0000000000..2876b9900b
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/intermingled-sources.js.map
@@ -0,0 +1,8 @@
+{
+  "version":3,
+  "file":"output.js",
+  "mappings":";;;qEAEA;AAAA;AAAA;AAAA;AAAA;AACE,oBAAQ,GAAR,CAAY,GAAZ;;AADF;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,G;;kBAAe,I;;;;;;;AAFf,QAAQ,GAAR,CAAY,GAAZ;;AAMA,QAAQ,GAAR,CAAY,GAAZ",
+  "sources":["input.js"],
+  "sourcesContent":["console.log(\"1\")\n\nasync function decl(){\n  console.log(\"2\");\n}\n\nconsole.log(\"3\");"],
+  "names":[]
+}
\ No newline at end of file
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/missingmap.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/missingmap.js
new file mode 100644
index 0000000000..5a162652a7
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/missingmap.js
@@ -0,0 +1,2 @@
+// Source where the map is missing.
+// # sourceMappingURL=missingmap.js.map
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot.js
new file mode 100644
index 0000000000..33d15cf494
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot.js
@@ -0,0 +1,2 @@
+/* Doesn't really matter what is in here.  */
+// # sourceMappingURL=noroot.js.map
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot.js.map
new file mode 100644
index 0000000000..dfeee2d765
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot.js.map
@@ -0,0 +1,9 @@
+{
+  "version": 3,
+  "sources": [
+    "heart.js"
+  ],
+  "names": [],
+  "mappings": ";AAAA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA,uBAAe;AACf;AACA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;;AAGA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;;;;;;;ACtCA;AACA,QAAO,SAAS;AAChB;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA;AACA;AACA;;;;;;;ACfA;AACA;AACA;;;;;;;ACFA;AACA;AACA;;AAEA,mBAAkB;;;;;;;ACJlB;AACA;AACA",
+  "file": "noroot.js"
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot2.js b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot2.js
new file mode 100644
index 0000000000..35aa77b92c
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot2.js
@@ -0,0 +1,2 @@
+/* Doesn't really matter what is in here.  */
+// # sourceMappingURL=noroot2.js.map
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot2.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot2.js.map
new file mode 100644
index 0000000000..1d22100178
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/noroot2.js.map
@@ -0,0 +1,10 @@
+{
+  "version": 3,
+  "sources": [
+    "heart.js"
+  ],
+  "names": [],
+  "mappings": ";AAAA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA,uBAAe;AACf;AACA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;AACA;;;AAGA;AACA;;AAEA;AACA;;AAEA;AACA;;AAEA;AACA;;;;;;;ACtCA;AACA,QAAO,SAAS;AAChB;;AAEA;AACA;;AAEA;AACA;AACA;;AAEA;AACA;AACA;AACA;AACA;;;;;;;ACfA;AACA;AACA;;;;;;;ACFA;AACA;AACA;;AAEA,mBAAkB;;;;;;;ACJlB;AACA;AACA",
+  "file": "noroot.js",
+  "sourceContents": ["this is the full text"]
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/fixtures/wasm.js.map b/devtools/client/shared/source-map-loader/test/browser/fixtures/wasm.js.map
new file mode 100644
index 0000000000..828f6a9aa4
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/fixtures/wasm.js.map
@@ -0,0 +1,7 @@
+{
+  "version": 3,
+  "file": "wasm.js",
+  "names": [],
+  "sources": ["one.js"],
+  "mappings": "CAAC,IAAM"
+}
diff --git a/devtools/client/shared/source-map-loader/test/browser/head.js b/devtools/client/shared/source-map-loader/test/browser/head.js
new file mode 100644
index 0000000000..0f54e5a5f5
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/test/browser/head.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/shared/test/shared-head.js",
+  this
+);
+
+const {
+  SourceMapLoader,
+} = require("resource://devtools/client/shared/source-map-loader/index.js");
+
+const gSourceMapLoader = new SourceMapLoader();
+
+function fetchFixtureSourceMap(name) {
+  gSourceMapLoader.clearSourceMaps();
+
+  const source = {
+    id: `${name}.js`,
+    sourceMapURL: `${name}.js.map`,
+    sourceMapBaseURL: `${URL_ROOT_SSL}fixtures/${name}.js`,
+  };
+
+  return gSourceMapLoader.getOriginalURLs(source);
+}