1 files changed, 75 insertions, 0 deletions
diff --git a/devtools/server/tests/unit/test_sourcemaps-12.js b/devtools/server/tests/unit/test_sourcemaps-12.js
new file mode 100644
index 000000000..cb7f29920
--- /dev/null
+++ b/devtools/server/tests/unit/test_sourcemaps-12.js
@@ -0,0 +1,75 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check that we continue stepping when a single original source's line
+ * corresponds to multiple generated js lines.
+ */
+
+var gDebuggee;
+var gClient;
+var gThreadClient;
+
+const {SourceNode} = require("source-map");
+
+function run_test() {
+  initTestDebuggerServer();
+  gDebuggee = addTestGlobal("test-source-map");
+  gClient = new DebuggerClient(DebuggerServer.connectPipe());
+  gClient.connect().then(function () {
+    attachTestTabAndResume(gClient, "test-source-map", function (aResponse, aTabClient, aThreadClient) {
+      gThreadClient = aThreadClient;
+      define_code();
+    });
+  });
+  do_test_pending();
+}
+
+function define_code() {
+  let { code, map } = (new SourceNode(null, null, null, [
+    new SourceNode(1, 0, "a.js", "function runTest() {\n"),
+    // A bunch of js lines map to the same original source line.
+    new SourceNode(2, 0, "a.js", "  debugger;\n"),
+    new SourceNode(2, 0, "a.js", "  var sum = 0;\n"),
+    new SourceNode(2, 0, "a.js", "  for (var i = 0; i < 5; i++) {\n"),
+    new SourceNode(2, 0, "a.js", "    sum += i;\n"),
+    new SourceNode(2, 0, "a.js", "  }\n"),
+    // And now we have a new line in the original source that we should stop at.
+    new SourceNode(3, 0, "a.js", "  sum;\n"),
+    new SourceNode(3, 0, "a.js", "}\n"),
+  ])).toStringWithSourceMap({
+    file: "abc.js",
+    sourceRoot: "http://example.com/"
+  });
+
+  code += "//# sourceMappingURL=data:text/json," + map.toString();
+
+  Components.utils.evalInSandbox(code, gDebuggee, "1.8",
+                                 "http://example.com/abc.js", 1);
+
+  run_code();
+}
+
+function run_code() {
+  gClient.addOneTimeListener("paused", function (aEvent, aPacket) {
+    do_check_eq(aPacket.why.type, "debuggerStatement");
+    step_in();
+  });
+  gDebuggee.runTest();
+}
+
+function step_in() {
+  gClient.addOneTimeListener("paused", function (aEvent, aPacket) {
+    do_check_eq(aPacket.why.type, "resumeLimit");
+    let { frame: { environment, where: { source, line } } } = aPacket;
+    // Stepping should have moved us to the next source mapped line.
+    do_check_eq(source.url, "http://example.com/a.js");
+    do_check_eq(line, 3);
+    // Which should have skipped over the for loop in the generated js and sum
+    // should be calculated.
+    do_check_eq(environment.bindings.variables.sum.value, 10);
+    finishClient(gClient);
+  });
+  gThreadClient.stepIn();
+}
+