1 files changed, 52 insertions, 0 deletions
diff --git a/devtools/client/framework/test/browser_source_map-late-script.js b/devtools/client/framework/test/browser_source_map-late-script.js
new file mode 100644
index 0000000000..f11d530db1
--- /dev/null
+++ b/devtools/client/framework/test/browser_source_map-late-script.js
@@ -0,0 +1,52 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that you can subscribe to notifications on a source before it has loaded.
+
+"use strict";
+
+const PAGE_URL = `${URL_ROOT_SSL}doc_empty-tab-01.html`;
+const JS_URL = URL_ROOT_SSL + "code_bundle_late_script.js";
+
+const ORIGINAL_URL = "webpack:///code_late_script.js";
+
+const GENERATED_LINE = 107;
+const ORIGINAL_LINE = 11;
+
+add_task(async function () {
+  // Start with the empty page, then navigate, so that we can properly
+  // listen for new sources arriving.
+  const toolbox = await openNewTabAndToolbox(PAGE_URL, "webconsole");
+  const service = toolbox.sourceMapURLService;
+
+  const scriptMapped = new Promise(resolve => {
+    let count = 0;
+    service.subscribeByURL(
+      JS_URL,
+      GENERATED_LINE,
+      undefined,
+      originalLocation => {
+        if (count === 0) {
+          resolve(originalLocation);
+        }
+        count += 1;
+
+        return () => {};
+      }
+    );
+  });
+
+  // Inject JS script
+  const sourceSeen = waitForSourceLoad(toolbox, JS_URL);
+  await createScript(JS_URL);
+  await sourceSeen;
+
+  // Ensure that the URL service fired an event about the location loading.
+  const { url, line } = await scriptMapped;
+  is(url, ORIGINAL_URL, "check mapped URL");
+  is(line, ORIGINAL_LINE, "check mapped line number");
+
+  await toolbox.destroy();
+  gBrowser.removeCurrentTab();
+  finish();
+});