Add unit tests for DartUrlResolverImpl.

third_party/src/test/java/com/jetbrains/lang/dart/util/DartUrlResolverTest.java

@@ -0,0 +1,52 @@
+package com.jetbrains.lang.dart.util;
+
+import com.intellij.openapi.roots.ModuleRootManager;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.jetbrains.lang.dart.DartCodeInsightFixtureTestCase;
+import org.jetbrains.annotations.NotNull;
+
+public class DartUrlResolverTest extends DartCodeInsightFixtureTestCase {
+
+  public void testDartUrl() {
+    final String dartCoreUrl = "dart:core";
+    final DartUrlResolver resolver = DartUrlResolver.getInstance(getProject(),
+        ModuleRootManager.getInstance(getModule()).getContentRoots()[0]);
+    final VirtualFile file = resolver.findFileByDartUrl(dartCoreUrl);
+    assertNotNull("dart:core not found", file);
+    assertEquals(dartCoreUrl, resolver.getDartUrlForFile(file));
+  }
+
+  public void testFileUrl() throws java.io.IOException {
+    // DartUrlResolverImpl uses LocalFileSystem, so we must use a real file on disk.
+    final java.io.File tempFile = java.io.File.createTempFile("test_file", ".dart");
+    tempFile.deleteOnExit();
+    final VirtualFile file = com.intellij.openapi.vfs.LocalFileSystem.getInstance()
+        .refreshAndFindFileByIoFile(tempFile);
+    assertNotNull(file);
+
+    final String fileUrl = tempFile.toURI().toString();
+    final DartUrlResolver resolver = DartUrlResolver.getInstance(getProject(), file);
+
+    assertEquals(file, resolver.findFileByDartUrl(fileUrl));
+
+    // Also verify getDartUrlForFile returns the file: url
+    assertEquals(fileUrl, resolver.getDartUrlForFile(file));
+  }
+
+  public void testPackageUrl() {
+    myFixture.addFileToProject("pubspec.yaml", "name: my_app\ndependencies:\n");
+    final VirtualFile file = myFixture.addFileToProject("lib/my_file.dart", "").getVirtualFile();
+    final String packageUrl = "package:my_app/my_file.dart";
+
+    final DartUrlResolver resolver = DartUrlResolver.getInstance(getProject(), file);
+
+    // We need to ensure the resolver sees the pubspec.
+    // DartUrlResolverImpl initializes with the finding the pubspec.
+
+    final VirtualFile resolvedFile = resolver.findFileByDartUrl(packageUrl);
+    assertNotNull("Should resolve package:my_app/my_file.dart", resolvedFile);
+    assertEquals(file, resolvedFile);
+
+    assertEquals(packageUrl, resolver.getDartUrlForFile(file));
+  }
+}