Bugzilla

Hi Brian,
can you please look at this test failure?

It's easily reproducible on my machine. I am seeing the following error:

```
Unexpected Results
------------------
devtools/client/debugger/test/mochitest/browser_dbg-wasm-sourcemaps.js
  FAIL Uncaught exception - at chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/helpers.js:651 - Error: Unable to find source: fib.c
Stack trace:
findSource@chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/helpers.js:651:11
selectSource@chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/helpers.js:724:28
@chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-wasm-sourcemaps.js:32:9
Async*Tester_execTest/<@chrome://mochikit/content/browser-test.js:1069:34
Tester_execTest@chrome://mochikit/content/browser-test.js:1104:11
nextTest/<@chrome://mochikit/content/browser-test.js:932:14
SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:805:67
```

Hi Brian,
can you please look at this test failure?

It's easily reproducible on my machine. I am seeing the following error:

```
Unexpected Results
------------------
devtools/client/debugger/test/mochitest/browser_dbg-wasm-sourcemaps.js
  FAIL Uncaught exception - at chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/helpers.js:651 - Error: Unable to find source: fib.c
Stack trace:
findSource@chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/helpers.js:651:11
selectSource@chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/helpers.js:724:28
@chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-wasm-sourcemaps.js:32:9
Async*Tester_execTest/<@chrome://mochikit/content/browser-test.js:1069:34
Tester_execTest@chrome://mochikit/content/browser-test.js:1104:11
nextTest/<@chrome://mochikit/content/browser-test.js:932:14
SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:805:67
```

It looks like racing issue. Perhaps the test isn't waiting for the source in the Sources tree?

The following wait seems to help, which indicates that ...


```
--- a/devtools/client/debugger/test/mochitest/browser_dbg-wasm-sourcemaps.js
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-wasm-sourcemaps.js
@@ -24,16 +24,19 @@ add_task(async function() {
   await addBreakpoint(dbg, "fib.c", 10);

   info("reload.");
   reload(dbg);

   // The same debugger statement as above, but using at for
   // workaround to break at original source (see below) and not generated.
   await waitForPaused(dbg);
+
+  // Waiting for the source seems to help.
+  await waitForTime(1000);
   await selectSource(dbg, "fib.c");

   info("resume");
   resume(dbg);
   await waitForPaused(dbg, "fib.c");

   const frames = findAllElements(dbg, "frames");
   const firstFrameTitle = frames[0].querySelector(".title").textContent;
```

Thanks!
Honza