Switch to @types/vscode and vscode-test

The old `vscode` package is outdated and it is recommened to switch to
these two new packages. This also solves a problem of a missing `.d.ts`
for `vscode` in Nixos.

editors/code/src/test/index.ts

@@ -1,22 +0,0 @@
-//
-// PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING
-//
-// This file is providing the test runner to use when running extension tests.
-// By default the test runner in use is Mocha based.
-//
-// You can provide your own test runner if you want to override it by exporting
-// a function run(testRoot: string, clb: (error:Error) => void) that the extension
-// host can call to run the tests. The test runner is expected to use console.log
-// to report the results back to the caller. When the tests are finished, return
-// a possible error to the callback or null if none.
-
-import * as testRunner from 'vscode/lib/testrunner';
-
-// You can directly control Mocha options by uncommenting the following lines
-// See https://github.com/mochajs/mocha/wiki/Using-mocha-programmatically#set-options for more info
-testRunner.configure({
-    ui: 'bdd', // the TDD UI is being used in extension.test.ts (suite, test, etc.)
-    useColors: true // colored output from test results
-});
-
-module.exports = testRunner;

editors/code/src/test/runTest.ts

@@ -0,0 +1,22 @@
+import * as path from 'path';
+
+import { runTests } from 'vscode-test';
+
+async function main() {
+    try {
+        // The folder containing the Extension Manifest package.json
+        // Passed to `--extensionDevelopmentPath`
+        const extensionDevelopmentPath = path.resolve(__dirname, '../../');
+
+        // The path to the extension test runner script
+        // Passed to --extensionTestsPath
+        const extensionTestsPath = path.resolve(__dirname, './utils/index');
+
+        // Download VS Code, unzip it and run the integration test
+        await runTests({ extensionDevelopmentPath, extensionTestsPath });
+    } catch (err) {
+        process.exit(1);
+    }
+}
+
+main();

editors/code/src/test/utils/index.ts

@@ -0,0 +1,49 @@
+//
+// PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING
+//
+// This file is providing the test runner to use when running extension tests.
+// By default the test runner in use is Mocha based.
+//
+// You can provide your own test runner if you want to override it by exporting
+// a function run(testRoot: string, clb: (error:Error) => void) that the extension
+// host can call to run the tests. The test runner is expected to use console.log
+// to report the results back to the caller. When the tests are finished, return
+// a possible error to the callback or null if none.
+
+import * as glob from 'glob';
+import * as Mocha from 'mocha';
+import * as path from 'path';
+
+export function run(): Promise<void> {
+    // Create the mocha test
+    const mocha = new Mocha({
+        ui: 'bdd'
+    });
+    mocha.useColors(true);
+
+    const testsRoot = __dirname;
+
+    return new Promise((c, e) => {
+        glob('**/**.test.js', { cwd: testsRoot }, (err, files) => {
+            if (err) {
+                return e(err);
+            }
+
+            // Add files to the test suite
+            files.forEach(f => mocha.addFile(path.resolve(testsRoot, f)));
+
+            try {
+                // Run the mocha test
+                mocha.run(failures => {
+                    if (failures > 0) {
+                        e(new Error(`${failures} tests failed.`));
+                    } else {
+                        c();
+                    }
+                });
+            } catch (err) {
+                e(err);
+            }
+        });
+    });
+}

editors/code/src/utils/diagnostics/rust.ts

@@ -64,7 +64,7 @@ function mapLevelToSeverity(s: string): vscode.DiagnosticSeverity {
  * Converts a Rust span to a VsCode location
  */
 function mapSpanToLocation(span: RustDiagnosticSpan): vscode.Location {
-    const fileName = path.join(vscode.workspace.rootPath!, span.file_name);
+    const fileName = path.join(vscode.workspace.rootPath || '', span.file_name);
     const fileUri = vscode.Uri.file(fileName);
 
     const range = new vscode.Range(