1 files changed, 53 insertions, 0 deletions
diff --git a/devtools/server/tests/xpcshell/test_breakpoint-01.js b/devtools/server/tests/xpcshell/test_breakpoint-01.js
new file mode 100644
index 0000000000..be46d97cfb
--- /dev/null
+++ b/devtools/server/tests/xpcshell/test_breakpoint-01.js
@@ -0,0 +1,53 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Check basic breakpoint functionality.
+ */
+
+add_task(
+  threadFrontTest(async ({ threadFront, debuggee }) => {
+    info("Wait for the debugger statement to be hit");
+    const packet1 = await executeOnNextTickAndWaitForPause(
+      () => evaluateTestCode(debuggee),
+      threadFront
+    );
+    const source = await getSourceById(threadFront, packet1.frame.where.actor);
+    const location = { sourceUrl: source.url, line: debuggee.line0 + 3 };
+
+    threadFront.setBreakpoint(location, {});
+
+    const packet2 = await resumeAndWaitForPause(threadFront);
+
+    info("Paused at the breakpoint");
+    Assert.equal(packet2.frame.where.actor, source.actor);
+    Assert.equal(packet2.frame.where.line, location.line);
+    Assert.equal(packet2.why.type, "breakpoint");
+
+    info("Check that the breakpoint worked.");
+    Assert.equal(debuggee.a, 1);
+    Assert.equal(debuggee.b, undefined);
+
+    await threadFront.resume();
+  })
+);
+
+function evaluateTestCode(debuggee) {
+  /*
+   * Be sure to run debuggee code in its own HTML 'task', so that when we call
+   * the onDebuggerStatement hook, the test's own microtasks don't get suspended
+   * along with the debuggee's.
+   */
+  do_timeout(0, () => {
+    // prettier-ignore
+    Cu.evalInSandbox(
+      "var line0 = Error().lineNumber;\n" +
+      "debugger;\n" + // line0 + 1
+      "var a = 1;\n" + // line0 + 2
+      "var b = 2;\n", // line0 + 3
+      debuggee
+    );
+  });
+}