1 files changed, 62 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-features-tabs.js b/devtools/client/debugger/test/mochitest/browser_dbg-features-tabs.js
new file mode 100644
index 0000000000..7aedb868e6
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-features-tabs.js
@@ -0,0 +1,62 @@
+/* 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/>. */
+
+/**
+ * This test focuses on the Tabs component, where we display all opened sources.
+ */
+
+"use strict";
+
+const testServer = createVersionizedHttpTestServer(
+  "examples/sourcemaps-reload-uncompressed"
+);
+const TEST_URL = testServer.urlFor("index.html");
+
+add_task(async function () {
+  // We open against a blank page and only then navigate to the test page
+  // so that sources aren't GC-ed before opening the debugger.
+  // When we (re)load a page while the debugger is opened, the debugger
+  // will force all sources to be held in memory.
+  const dbg = await initDebuggerWithAbsoluteURL("about:blank");
+
+  await navigateToAbsoluteURL(dbg, TEST_URL, ...INTEGRATION_TEST_PAGE_SOURCES);
+
+  info("Wait for all sources to be displayed in the source tree");
+  let displayedSources;
+  await waitFor(() => {
+    displayedSources = dbg.selectors.getDisplayedSourcesList();
+    return displayedSources.length == INTEGRATION_TEST_PAGE_SOURCES.length;
+  }, "Got the expected number of sources from the selectors");
+
+  // Open each visible source in tabs
+  const uniqueUrls = new Set();
+  for (const source of displayedSources) {
+    info(`Opening '${source.url}'`);
+    await selectSource(dbg, source);
+    uniqueUrls.add(source.url);
+  }
+
+  // Some sources are loaded from the same URL and only one tab will be opened for them
+  is(countTabs(dbg), uniqueUrls.size, "Got a tab for each distinct source URL");
+
+  await reload(dbg, ...INTEGRATION_TEST_PAGE_SOURCES);
+
+  await waitFor(
+    () => countTabs(dbg) == uniqueUrls.size,
+    "Wait for tab count to be fully restored"
+  );
+
+  is(
+    countTabs(dbg),
+    uniqueUrls.size,
+    "Still get the same number of tabs after reload"
+  );
+
+  for (const source of displayedSources) {
+    info(`Closing '${source.url}'`);
+    await closeTab(dbg, source);
+  }
+
+  is(countTabs(dbg), 0, "All tabs are closed");
+});