1 files changed, 69 insertions, 0 deletions
diff --git a/devtools/server/tests/xpcshell/test_stepping-17.js b/devtools/server/tests/xpcshell/test_stepping-17.js
new file mode 100644
index 0000000000..816946fa4c
--- /dev/null
+++ b/devtools/server/tests/xpcshell/test_stepping-17.js
@@ -0,0 +1,69 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * Check that you can step from one script or event to another
+ */
+
+add_task(
+  threadFrontTest(async ({ commands, threadFront, debuggee }) => {
+    Cu.evalInSandbox(
+      `function blackboxed(callback) { return () => callback(); }`,
+      debuggee,
+      "1.8",
+      "http://example.com/blackboxed.js",
+      1
+    );
+
+    const { sources } = await getSources(threadFront);
+    const blackboxedSourceFront = threadFront.source(
+      sources.find(source => source.url == "http://example.com/blackboxed.js")
+    );
+    blackBox(blackboxedSourceFront);
+
+    const testStepping = async function (wrapperName, stepHandler, message) {
+      commands.scriptCommand.execute(`(function () {
+          const p = Promise.resolve();
+          p.then(${wrapperName}(() => { debugger; }))
+          .then(${wrapperName}(() => { }));
+        })();`);
+
+      await waitForEvent(threadFront, "paused");
+      const step = await stepHandler(threadFront);
+      Assert.equal(step.frame.where.line, 4, message);
+      await resume(threadFront);
+    };
+
+    const stepTwice = async function () {
+      await stepOver(threadFront);
+      return stepOver(threadFront);
+    };
+
+    await testStepping("", stepTwice, "Step over on the outermost frame");
+    await testStepping("blackboxed", stepTwice, "Step over with blackboxing");
+    await testStepping("", stepOut, "Step out on the outermost frame");
+    await testStepping("blackboxed", stepOut, "Step out with blackboxing");
+
+    commands.scriptCommand.execute(`(async function () {
+        const p = Promise.resolve();
+        const p2 = p.then(() => {
+          debugger;
+          return "async stepping!";
+        });
+        debugger;
+        await p;
+        const result = await p2;
+        return result;
+      })();
+      `);
+
+    await waitForEvent(threadFront, "paused");
+    await stepOver(threadFront);
+    await stepOver(threadFront);
+    const step = await stepOut(threadFront);
+    await resume(threadFront);
+    Assert.equal(step.frame.where.line, 9, "Step out of promise into async fn");
+  })
+);