1 files changed, 141 insertions, 0 deletions
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"
+    );
+  }
+});