coverage: Improve generation, see below.

runtime/vm/coverage_test.cc

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "vm/coverage.h"
+#include "vm/dart_api_impl.h"
+#include "vm/unit_test.h"
+
+namespace dart {
+
+static void ExecuteScript(const char* script) {
+  Dart_Handle h_lib = TestCase::LoadTestScript(script, NULL);
+  EXPECT_VALID(h_lib);
+  Library& lib = Library::Handle();
+  lib ^= Api::UnwrapHandle(h_lib);
+  EXPECT(!lib.IsNull());
+  Dart_Handle result = Dart_Invoke(h_lib, NewString("main"), 0, NULL);
+  EXPECT_VALID(result);
+}
+
+
+TEST_CASE(Coverage_Empty) {
+  const char* kScript =
+      "main() {\n"
+      "}";
+
+  Isolate* isolate = Isolate::Current();
+  ExecuteScript(kScript);
+
+  JSONStream js;
+  CodeCoverage::PrintJSON(isolate, &js);
+
+  EXPECT_SUBSTRING(
+      "{\"source\":\"test-lib\",\"script\":{"
+      "\"type\":\"@Script\",\"id\":\"scripts\\/test-lib\","
+      "\"name\":\"test-lib\",\"user_name\":\"test-lib\","
+      "\"kind\":\"script\"},\"hits\":[]}", js.ToCString());
+}
+
+
+TEST_CASE(Coverage_MainWithClass) {
+  const char* kScript =
+      "class Foo {\n"
+      "  var x;\n"
+      "  Foo(this.x);\n"
+      "  bar() {\n"
+      "    x = x * x;\n"
+      "    x = x / 13;\n"
+      "  }\n"
+      "}\n"
+      "main() {\n"
+      "  var foo = new Foo(7);\n"
+      "  foo.bar();\n"
+      "}\n";
+
+  Isolate* isolate = Isolate::Current();
+  ExecuteScript(kScript);
+
+  JSONStream js;
+  CodeCoverage::PrintJSON(isolate, &js);
+
+  // Coverage data is printed per class, i.e., there should be two sections
+  // for test-lib in the JSON data.
+
+  // Data for the actual class Foo.
+  EXPECT_SUBSTRING(
+      "{\"source\":\"test-lib\",\"script\":{"
+      "\"type\":\"@Script\",\"id\":\"scripts\\/test-lib\","
+      "\"name\":\"test-lib\",\"user_name\":\"test-lib\","
+      "\"kind\":\"script\"},\"hits\":[3,1,5,4,6,3]}", js.ToCString());
+
+  // Data for the fake class containing main().
+  EXPECT_SUBSTRING(
+      "{\"source\":\"test-lib\",\"script\":{"
+      "\"type\":\"@Script\",\"id\":\"scripts\\/test-lib\","
+      "\"name\":\"test-lib\",\"user_name\":\"test-lib\","
+      "\"kind\":\"script\"},\"hits\":[10,1,11,1]}", js.ToCString());
+}
+
+}  // namespace dart