Добавил базовый код для выполнения тестов

.vscode/launch.json

@@ -24,10 +24,10 @@
 			"runtimeExecutable": "${execPath}",
 			"args": [
 				"--extensionDevelopmentPath=${workspaceFolder}",
-				"--extensionTestsPath=${workspaceFolder}/out/src/test"
+				"--extensionTestsPath=${workspaceFolder}/out/test"
 			],
 			"outFiles": [
-				"${workspaceFolder}/out/src/test/**/*.js"
+				"${workspaceFolder}/out/test/**/*.js"
 			],
 			"preLaunchTask": "npm: watch"
 		}

package.json

@@ -75,7 +75,10 @@
     },
     "devDependencies": {
         "@types/glob": "^7.1.1",
+        "@types/mocha": "^5.2.5",
         "@types/node": "^10.11.3",
+        "mocha": "^5.2.0",
+        "should": "^13.2.3",
         "tslib": "^1.9.3",
         "tslint": "^5.11.0",
         "typescript": "^3.1.1",

test/index.ts

@@ -0,0 +1,56 @@
+"use strict";
+
+import * as fs from "fs";
+import * as glob from "glob";
+import * as paths from "path";
+
+const Mocha = require("mocha");
+
+// Linux: prevent a weird NPE when mocha on Linux requires the window size from the TTY
+// Since we are not running in a tty environment, we just implementt he method statically
+const tty = require("tty");
+if (!tty.getWindowSize) {
+    tty.getWindowSize = (): number[] => {
+        return [80, 75];
+    };
+}
+
+let mocha = new Mocha({
+    ui: "bdd",
+    useColors: true,
+});
+
+function configure(mochaOpts): void {
+    mocha = new Mocha(mochaOpts);
+}
+exports.configure = configure;
+
+function run(testsRoot, clb): any {
+    // Enable source map support
+
+    // Glob test files
+    glob("**/**.test.js", { cwd: testsRoot }, (error, files): any => {
+        if (error) {
+            return clb(error);
+        }
+        try {
+            // Fill into Mocha
+            files.forEach((f): Mocha => {
+                return mocha.addFile(paths.join(testsRoot, f));
+            });
+            // Run the tests
+            let failureCount = 0;
+
+            mocha.run()
+                .on("fail", (): void => {
+                failureCount++;
+            })
+            .on("end", (): void => {
+                clb(undefined, failureCount);
+            });
+        } catch (error) {
+            return clb(error);
+        }
+    });
+}
+exports.run = run;

tsconfig.json

@@ -2,7 +2,7 @@
 	"compilerOptions": {
 		"module": "commonjs",
 		"target": "es6",
-		"outDir": "out/src",
+		"outDir": "out",
 		"lib": [
             "es6"
         ],