1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/framework/test/browser_toolbox_selected_tool_unavailable.js b/devtools/client/framework/test/browser_toolbox_selected_tool_unavailable.js
new file mode 100644
index 0000000000..c55ad5867c
--- /dev/null
+++ b/devtools/client/framework/test/browser_toolbox_selected_tool_unavailable.js
@@ -0,0 +1,46 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that opening the toolbox doesn't throw when the previously selected
+// tool is not supported.
+
+const testToolDefinition = {
+  id: "testTool",
+  isToolSupported: () => true,
+  visibilityswitch: "devtools.test-tool.enabled",
+  url: "about:blank",
+  label: "someLabel",
+  build: (iframeWindow, toolbox) => {
+    return {
+      target: toolbox.target,
+      toolbox,
+      isReady: true,
+      destroy: () => {},
+      panelDoc: iframeWindow.document,
+    };
+  },
+};
+
+add_task(async function () {
+  gDevTools.registerTool(testToolDefinition);
+  let tab = await addTab("about:blank");
+
+  let toolbox = await gDevTools.showToolboxForTab(tab, {
+    toolId: testToolDefinition.id,
+  });
+  is(toolbox.currentToolId, "testTool", "test-tool was selected");
+  await toolbox.destroy();
+
+  // Make the previously selected tool unavailable.
+  testToolDefinition.isToolSupported = () => false;
+
+  toolbox = await gDevTools.showToolboxForTab(tab);
+  is(toolbox.currentToolId, "webconsole", "web console was selected");
+
+  await toolbox.destroy();
+  gDevTools.unregisterTool(testToolDefinition.id);
+  tab = toolbox = null;
+  gBrowser.removeCurrentTab();
+});