Test for the implementation provider

Author: akshita31

test/integrationTests/implementationProvider.test.ts

@@ -0,0 +1,37 @@
+/*--------------------------------------------------------------------------------------------- 
+*  Copyright (c) Microsoft Corporation. All rights reserved. 
+*  Licensed under the MIT License. See License.txt in the project root for license information. 
+*--------------------------------------------------------------------------------------------*/
+
+import * as vscode from "vscode";
+import CSharpImplementationProvider from "../../src/features/implementationProvider";
+import CSharpExtensionExports from "../../src/CSharpExtensionExports";
+import * as path from "path";
+import testAssetWorkspace from "./testAssets/testAssetWorkspace";
+import { expect } from "chai";
+
+suite(`${CSharpImplementationProvider.name}: ${testAssetWorkspace.description}`, () => {
+    let fileUri: vscode.Uri;
+    
+    suiteSetup(async () => {
+        let csharpExtension = vscode.extensions.getExtension<CSharpExtensionExports>("ms-vscode.csharp");
+        if (!csharpExtension.isActive) {
+            await csharpExtension.activate();
+        }
+
+        await csharpExtension.exports.initializationFinished();
+        let fileName = 'implementation.cs';
+        let dir = path.dirname(testAssetWorkspace.projects[0].projectDirectoryPath);
+        fileUri = vscode.Uri.file(path.join(dir, fileName));
+        await vscode.commands.executeCommand("vscode.open", fileUri);
+    });
+
+    suiteTeardown(async () => {
+        await testAssetWorkspace.cleanupWorkspace();
+    });
+
+    test("Returns the implementation", async() => {
+        let implementationList = <vscode.Location[]>(await vscode.commands.executeCommand("vscode.executeImplementationProvider", fileUri, new vscode.Position(4, 22)));
+        expect(implementationList.length).to.be.equal(2);
+    });
+});

test/integrationTests/testAssets/singleCsproj/implementation.cs

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+using System;
+
+namespace minimal
+{
+    public class BaseClass {}
+    public class SomeClass : BaseClass {}
+}

test/integrationTests/testAssets/slnWithCsproj/src/app/implementation.cs

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+using System;
+
+namespace minimal
+{
+    public class BaseClass {}
+    public class SomeClass : BaseClass {}
+}