1 files changed, 65 insertions, 0 deletions
diff --git a/devtools/platform/tests/xpcshell/test_nsjsinspector.js b/devtools/platform/tests/xpcshell/test_nsjsinspector.js
new file mode 100644
index 0000000000..74d18b7689
--- /dev/null
+++ b/devtools/platform/tests/xpcshell/test_nsjsinspector.js
@@ -0,0 +1,65 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test the basic functionality of the nsIJSInspector component.
+var gCount = 0;
+const MAX = 10;
+
+var inspector = Cc["@mozilla.org/jsinspector;1"].getService(Ci.nsIJSInspector);
+
+// Emulate 10 simultaneously-debugged windows from 3 separate client connections.
+var requestor = count => ({
+  url: "http://foo/bar/" + count,
+  connection: "conn" + (count % 3),
+});
+
+function run_test() {
+  test_nesting();
+}
+
+function test_nesting() {
+  Assert.equal(inspector.eventLoopNestLevel, 0);
+
+  Services.tm.dispatchToMainThread({ run: enterEventLoop });
+
+  Assert.equal(inspector.enterNestedEventLoop(requestor(gCount)), 0);
+  Assert.equal(inspector.eventLoopNestLevel, 0);
+  Assert.equal(inspector.lastNestRequestor, null);
+}
+
+function enterEventLoop() {
+  if (gCount++ < MAX) {
+    Services.tm.dispatchToMainThread({ run: enterEventLoop });
+
+    Object.create(requestor(gCount));
+
+    Assert.equal(inspector.eventLoopNestLevel, gCount);
+    Assert.equal(inspector.lastNestRequestor.url, requestor(gCount - 1).url);
+    Assert.equal(
+      inspector.lastNestRequestor.connection,
+      requestor(gCount - 1).connection
+    );
+    Assert.equal(inspector.enterNestedEventLoop(requestor(gCount)), gCount);
+  } else {
+    Assert.equal(gCount, MAX + 1);
+    Services.tm.dispatchToMainThread({ run: exitEventLoop });
+  }
+}
+
+function exitEventLoop() {
+  if (inspector.lastNestRequestor != null) {
+    Assert.equal(inspector.lastNestRequestor.url, requestor(gCount - 1).url);
+    Assert.equal(
+      inspector.lastNestRequestor.connection,
+      requestor(gCount - 1).connection
+    );
+    if (gCount-- > 1) {
+      Services.tm.dispatchToMainThread({ run: exitEventLoop });
+    }
+
+    Assert.equal(inspector.exitNestedEventLoop(), gCount);
+    Assert.equal(inspector.eventLoopNestLevel, gCount);
+  }
+}