[ES6 modules] Introduce ScriptModuleResolverImpl

third_party/WebKit/Source/core/dom/ScriptModuleResolverImplTest.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/dom/ScriptModuleResolverImpl.h"
+
+#include "bindings/core/v8/V8BindingForTesting.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/dom/Modulator.h"
+#include "core/dom/ModuleScript.h"
+#include "core/testing/DummyModulator.h"
+#include "platform/heap/Handle.h"
+#include "platform/testing/TestingPlatformSupport.h"
+#include "public/platform/Platform.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "v8/include/v8.h"
+
+namespace blink {
+
+class ScriptModuleResolverImplTestModulator final : public DummyModulator {
+ public:
+  ScriptModuleResolverImplTestModulator() {}
+  virtual ~ScriptModuleResolverImplTestModulator() {}
+
+  DECLARE_TRACE();
+
+  int getFetchedModuleScriptCalled() const {
+    return m_getFetchedModuleScriptCalled;
+  }
+  void setModuleScript(ModuleScript* moduleScript) {
+    m_moduleScript = moduleScript;
+  }
+  const KURL& fetchedUrl() const { return m_fetchedUrl; }
+
+ private:
+  // Implements Modulator:
+  ModuleScript* getFetchedModuleScript(const KURL&) override;
+
+  int m_getFetchedModuleScriptCalled = 0;
+  KURL m_fetchedUrl;
+  Member<ModuleScript> m_moduleScript;
+};
+
+DEFINE_TRACE(ScriptModuleResolverImplTestModulator) {
+  visitor->trace(m_moduleScript);
+  DummyModulator::trace(visitor);
+}
+
+ModuleScript* ScriptModuleResolverImplTestModulator::getFetchedModuleScript(
+    const KURL& url) {
+  m_getFetchedModuleScriptCalled++;
+  m_fetchedUrl = url;
+  return m_moduleScript.get();
+}
+
+class ScriptModuleResolverImplTest : public testing::Test {
+ public:
+  void SetUp() override;
+
+  ScriptModuleResolverImplTestModulator* modulator() {
+    return m_modulator.get();
+  }
+
+ protected:
+  ScopedTestingPlatformSupport<TestingPlatformSupportWithMockScheduler>
+      m_platform;
+  Persistent<ScriptModuleResolverImplTestModulator> m_modulator;
+};
+
+void ScriptModuleResolverImplTest::SetUp() {
+  m_platform->advanceClockSeconds(1.);  // For non-zero DocumentParserTimings
+  m_modulator = new ScriptModuleResolverImplTestModulator();
+}
+
+ModuleScript* createReferrerModuleScript(V8TestingScope& scope) {

[yhirano, 2017/04/06 05:30:21]

Please define this function in an unnamed namespace.

[kouhei (in TOK), 2017/04/06 05:34:18]

Done.

+  ScriptModule referrerRecord = ScriptModule::compile(
+      scope.isolate(), "import './target.js'; export const a = 42;",
+      "referrer.js");
+  KURL referrerUrl(KURL(), "https://example.com/referrer.js");

[kinuko, 2017/04/05 14:05:00]

KURL referrerUrl(ParsedURLString, "https://example.com/referrer.js");

?  (here and below)

[kouhei (in TOK), 2017/04/06 05:34:18]

Done.

+  ModuleScript* referrerModuleScript =
+      ModuleScript::create(referrerRecord, referrerUrl, "", ParserInserted,
+                           WebURLRequest::FetchCredentialsModeOmit);
+  // TODO(kouhei): moduleScript->setInstantiateSuccess(); once
+  // https://codereview.chromium.org/2782403002/ landed.
+  return referrerModuleScript;
+}
+
+ModuleScript* createTargetModuleScript(V8TestingScope& scope) {

[yhirano, 2017/04/06 05:30:21]

ditto

[kouhei (in TOK), 2017/04/06 05:34:18]

Done.

+  ScriptModule record = ScriptModule::compile(
+      scope.isolate(), "export const pi = 3.14;", "target.js");
+  KURL url(KURL(), "https://example.com/target.js");
+  ModuleScript* moduleScript = ModuleScript::create(
+      record, url, "", ParserInserted, WebURLRequest::FetchCredentialsModeOmit);
+  // TODO(kouhei): moduleScript->setInstantiateSuccess(); once
+  // https://codereview.chromium.org/2782403002/ landed.
+  return moduleScript;
+}
+
+TEST_F(ScriptModuleResolverImplTest, registerResolveSuccess) {
+  ScriptModuleResolverImpl* resolver =
+      ScriptModuleResolverImpl::create(modulator());
+  V8TestingScope scope;
+
+  ModuleScript* referrerModuleScript = createReferrerModuleScript(scope);
+  resolver->registerModuleScript(referrerModuleScript);
+
+  ModuleScript* targetModuleScript = createTargetModuleScript(scope);
+  modulator()->setModuleScript(targetModuleScript);
+
+  ScriptModule resolved = resolver->resolve(
+      "./target.js", referrerModuleScript->record(), scope.getExceptionState());
+  EXPECT_FALSE(scope.getExceptionState().hadException());
+  EXPECT_EQ(resolved, targetModuleScript->record());
+  EXPECT_EQ(m_modulator->getFetchedModuleScriptCalled(), 1);
+  EXPECT_EQ(m_modulator->fetchedUrl(), targetModuleScript->baseURL())
+      << "Unexpectedly fetched URL: " << m_modulator->fetchedUrl().getString();
+}
+
+TEST_F(ScriptModuleResolverImplTest, resolveInvalidModuleSpecifier) {
+  ScriptModuleResolverImpl* resolver =
+      ScriptModuleResolverImpl::create(modulator());
+  V8TestingScope scope;
+
+  ModuleScript* referrerModuleScript = createReferrerModuleScript(scope);
+  resolver->registerModuleScript(referrerModuleScript);
+
+  ModuleScript* targetModuleScript = createTargetModuleScript(scope);
+  modulator()->setModuleScript(targetModuleScript);
+
+  ScriptModule resolved = resolver->resolve(
+      "invalid", referrerModuleScript->record(), scope.getExceptionState());
+  EXPECT_TRUE(scope.getExceptionState().hadException());
+  EXPECT_EQ(scope.getExceptionState().code(), V8TypeError);
+  EXPECT_TRUE(resolved.isNull());
+  EXPECT_EQ(m_modulator->getFetchedModuleScriptCalled(), 0);

[kinuko, 2017/04/05 14:05:00]

nit: EXPECT_EQ expects expected value as 1st param, i.e. (expected, actual)

[kouhei (in TOK), 2017/04/06 05:34:18]

Done.

+}
+
+TEST_F(ScriptModuleResolverImplTest, resolveLoadFailedModule) {
+  ScriptModuleResolverImpl* resolver =
+      ScriptModuleResolverImpl::create(modulator());
+  V8TestingScope scope;
+
+  ModuleScript* referrerModuleScript = createReferrerModuleScript(scope);
+  resolver->registerModuleScript(referrerModuleScript);
+
+  ModuleScript* targetModuleScript = createTargetModuleScript(scope);
+  // Set Modulator::getFetchedModuleScript to return nullptr, which represents
+  // that the target module failed to load.
+  modulator()->setModuleScript(nullptr);
+
+  ScriptModule resolved = resolver->resolve(
+      "./target.js", referrerModuleScript->record(), scope.getExceptionState());
+  EXPECT_TRUE(scope.getExceptionState().hadException());
+  EXPECT_EQ(scope.getExceptionState().code(), V8TypeError);
+  EXPECT_TRUE(resolved.isNull());
+  EXPECT_EQ(m_modulator->getFetchedModuleScriptCalled(), 1);
+  EXPECT_EQ(m_modulator->fetchedUrl(), targetModuleScript->baseURL())
+      << "Unexpectedly fetched URL: " << m_modulator->fetchedUrl().getString();
+}
+
+}  // namespace blink