1 files changed, 113 insertions, 0 deletions
diff --git a/devtools/shared/tests/xpcshell/test_fetch-file.js b/devtools/shared/tests/xpcshell/test_fetch-file.js
new file mode 100644
index 0000000000..47d3f52681
--- /dev/null
+++ b/devtools/shared/tests/xpcshell/test_fetch-file.js
@@ -0,0 +1,113 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Tests for DevToolsUtils.fetch on file:// URI's.
+
+const { FileUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/FileUtils.sys.mjs"
+);
+
+const TEST_CONTENT = "aéd";
+
+// The TEST_CONTENT encoded as UTF-8.
+const UTF8_TEST_BUFFER = new Uint8Array([0x61, 0xc3, 0xa9, 0x64]);
+
+// The TEST_CONTENT encoded as ISO 8859-1.
+const ISO_8859_1_BUFFER = new Uint8Array([0x61, 0xe9, 0x64]);
+
+/**
+ * Tests that URLs with arrows pointing to an actual source are handled properly
+ * (bug 808960). For example 'resource://gre/modules/XPIProvider.sys.mjs ->
+ * file://l10n.js' should load 'file://l10n.js'.
+ */
+add_task(async function test_arrow_urls() {
+  const { path } = createTemporaryFile(".js");
+  const url = "resource://gre/modules/XPIProvider.sys.mjs -> file://" + path;
+
+  await IOUtils.writeUTF8(path, TEST_CONTENT);
+  const { content } = await DevToolsUtils.fetch(url);
+
+  deepEqual(content, TEST_CONTENT, "The file contents were correctly read.");
+});
+
+/**
+ * Tests that empty files are read correctly.
+ */
+add_task(async function test_empty() {
+  const { path } = createTemporaryFile();
+  const { content } = await DevToolsUtils.fetch("file://" + path);
+  deepEqual(content, "", "The empty file was read correctly.");
+});
+
+/**
+ * Tests that UTF-8 encoded files are correctly read.
+ */
+add_task(async function test_encoding_utf8() {
+  const { path } = createTemporaryFile();
+  await IOUtils.write(path, UTF8_TEST_BUFFER);
+
+  const { content } = await DevToolsUtils.fetch(path);
+  deepEqual(
+    content,
+    TEST_CONTENT,
+    "The UTF-8 encoded file was correctly read."
+  );
+});
+
+/**
+ * Tests that ISO 8859-1 (Latin-1) encoded files are correctly read.
+ */
+add_task(async function test_encoding_iso_8859_1() {
+  const { path } = createTemporaryFile();
+  await IOUtils.write(path, ISO_8859_1_BUFFER);
+
+  const { content } = await DevToolsUtils.fetch(path);
+  deepEqual(
+    content,
+    TEST_CONTENT,
+    "The ISO 8859-1 encoded file was correctly read."
+  );
+});
+
+/**
+ * Test that non-existent files are handled correctly.
+ */
+add_task(async function test_missing() {
+  await DevToolsUtils.fetch("file:///file/not/found.right").then(
+    result => {
+      info(result);
+      ok(false, "Fetch resolved unexpectedly when the file was not found.");
+    },
+    () => {
+      ok(true, "Fetch rejected as expected because the file was not found.");
+    }
+  );
+});
+
+/**
+ * Test that URLs without file:// scheme work.
+ */
+add_task(async function test_schemeless_files() {
+  const { path } = createTemporaryFile();
+
+  await IOUtils.writeUTF8(path, TEST_CONTENT);
+
+  const { content } = await DevToolsUtils.fetch(path);
+  deepEqual(content, TEST_CONTENT, "The content was correct.");
+});
+
+/**
+ * Creates a temporary file that is removed after the test completes.
+ */
+function createTemporaryFile(extension) {
+  const name = "test_fetch-file-" + Math.random() + (extension || "");
+  const file = new FileUtils.File(PathUtils.join(PathUtils.tempDir, name));
+  file.create(Ci.nsIFile.NORMAL_FILE_TYPE, parseInt("0755", 8));
+
+  registerCleanupFunction(() => {
+    file.remove(false);
+  });
+
+  return file;
+}