1 files changed, 128 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-overrides.js b/devtools/client/debugger/test/mochitest/browser_dbg-overrides.js
new file mode 100644
index 0000000000..136a11c497
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-overrides.js
@@ -0,0 +1,128 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+/**
+ * Testing the script overrides feature
+ */
+
+"use strict";
+
+const httpServer = createTestHTTPServer();
+const BASE_URL = `http://localhost:${httpServer.identity.primaryPort}/`;
+
+httpServer.registerContentType("html", "text/html");
+httpServer.registerContentType("js", "application/javascript");
+
+const testSourceContent = `function foo() {
+  console.log("original test script");
+}`;
+
+const testOverrideSourceContent = `function foo() {
+  console.log("overriden test script");
+}
+foo();
+`;
+
+httpServer.registerPathHandler("/index.html", (request, response) => {
+  response.setStatusLine(request.httpVersion, 200, "OK");
+  response.write(`<!DOCTYPE html>
+  <html>
+    <head>
+    <script type="text/javascript" src="/test.js"></script>
+    </head>
+    <body>
+    </body>
+  </html>
+  `);
+});
+
+httpServer.registerPathHandler("/test.js", (request, response) => {
+  response.setHeader("Content-Type", "application/javascript");
+  response.write(testSourceContent);
+});
+
+add_task(async function () {
+  const dbg = await initDebuggerWithAbsoluteURL(
+    BASE_URL + "index.html",
+    "test.js"
+  );
+
+  await waitForSourcesInSourceTree(dbg, ["test.js"], {
+    noExpand: false,
+  });
+
+  info("Load and assert the content of the test.js script");
+  await selectSourceFromSourceTree(
+    dbg,
+    "test.js",
+    3,
+    "Select the `test.js` script for the tree"
+  );
+  is(
+    getCM(dbg).getValue(),
+    testSourceContent,
+    "The test.js is the original source content"
+  );
+
+  info("Add a breakpoint");
+  await addBreakpoint(dbg, "test.js", 2);
+
+  info("Select test.js tree node, and add override");
+  const MockFilePicker = SpecialPowers.MockFilePicker;
+  MockFilePicker.init(window);
+  const nsiFile = FileUtils.getFile("TmpD", [`test.js`]);
+  MockFilePicker.setFiles([nsiFile]);
+  const path = nsiFile.path;
+
+  await triggerSourceTreeContextMenu(
+    dbg,
+    findSourceNodeWithText(dbg, "test.js"),
+    "#node-menu-overrides"
+  );
+
+  info("Wait for `test.js` to be saved to disk and re-write it");
+  await BrowserTestUtils.waitForCondition(() => IOUtils.exists(path));
+  await BrowserTestUtils.waitForCondition(async () => {
+    const { size } = await IOUtils.stat(path);
+    return size > 0;
+  });
+
+  await IOUtils.write(
+    path,
+    new TextEncoder().encode(testOverrideSourceContent)
+  );
+
+  info("Reload and assert `test.js` pause and it overriden source content");
+  const onReloaded = reload(dbg, "test.js");
+  await waitForPaused(dbg);
+
+  assertPausedAtSourceAndLine(dbg, findSource(dbg, "test.js").id, 2);
+  is(
+    getCM(dbg).getValue(),
+    testOverrideSourceContent,
+    "The test.js is the overridden source content"
+  );
+
+  await resume(dbg);
+  await onReloaded;
+
+  info("Remove override and test");
+  const removed = waitForDispatch(dbg.store, "REMOVE_OVERRIDE");
+  await triggerSourceTreeContextMenu(
+    dbg,
+    findSourceNodeWithText(dbg, "test.js"),
+    "#node-menu-overrides"
+  );
+  await removed;
+
+  info("Reload and assert `test.js`'s original source content");
+  await reload(dbg, "test.js");
+  await waitForSelectedSource(dbg, "test.js");
+
+  is(
+    getCM(dbg).getValue(),
+    testSourceContent,
+    "The test.js is the original source content"
+  );
+});