[ES6 modules] Implement https://html.spec.whatwg.org/#resolve-a-module-specifier

third_party/WebKit/Source/core/dom/ModulatorTest.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/Modulator.h"
+
+#include "platform/testing/TestingPlatformSupport.h"
+#include "public/platform/Platform.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+TEST(ModulatorTest, resolveModuleSpecifier) {
+  // Taken from examples listed in
+  // https://html.spec.whatwg.org/#resolve-a-module-specifier
+
+  // "The following are valid module specifiers according to the above
+  // algorithm:"
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier("https://example.com/apples.js", KURL())
+          .isValid());
+
+  KURL resolved =
+      Modulator::resolveModuleSpecifier("http:example.com\\pears.mjs", KURL());
+  EXPECT_TRUE(resolved.isValid());
+  EXPECT_EQ("http://example.com/pears.mjs", resolved.getString());
+
+  KURL baseURL(KURL(), "https://example.com");
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier("//example.com/", baseURL).isValid());
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier("./strawberries.js.cgi", baseURL)
+          .isValid());
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier("../lychees", baseURL).isValid());
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier("/limes.jsx", baseURL).isValid());
+  EXPECT_TRUE(Modulator::resolveModuleSpecifier(
+                  "data:text/javascript,export default 'grapes';", KURL())
+                  .isValid());
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier(
+          "blob:https://whatwg.org/d0360e2f-caee-469f-9a2f-87d5b0456f6f",
+          KURL())
+          .isValid());
+
+  // "The following are valid module specifiers according to the above
+  // algorithm, but will invariably cause failures when they are fetched:"
+  EXPECT_TRUE(Modulator::resolveModuleSpecifier(
+                  "javascript:export default 'artichokes';", KURL())
+                  .isValid());
+  EXPECT_TRUE(Modulator::resolveModuleSpecifier(
+                  "data:text/plain,export default 'kale';", KURL())
+                  .isValid());
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier("about:legumes", KURL()).isValid());
+  EXPECT_TRUE(
+      Modulator::resolveModuleSpecifier("wss://example.com/celery", KURL())
+          .isValid());
+
+  // "The following are not valid module specifiers according to the above
+  // algorithm:"
+  EXPECT_FALSE(
+      Modulator::resolveModuleSpecifier("https://f:b/c", KURL()).isValid());
+  EXPECT_FALSE(
+      Modulator::resolveModuleSpecifier("pumpkins.js", KURL()).isValid());
+
+  // Unprefixed module specifiers should still fail w/ a valid baseURL.
+  EXPECT_FALSE(
+      Modulator::resolveModuleSpecifier("avocados.js", baseURL).isValid());
+}
+
+}  // namespace blink