test: add unit tests

Author: BoxBoxJason

.gitignore

@@ -5,3 +5,8 @@ author.sh
 *.vsix
 .vscode-test/
 .copilot/
+
+# Coverage
+.nyc_output/
+coverage/
+dist-cov/

.vscode-test.js

@@ -0,0 +1,14 @@
+const { defineConfig } = require('@vscode/test-cli');
+
+module.exports = defineConfig([
+  {
+    label: 'unitTests',
+    files: 'dist/test/**/*.test.js',
+    version: 'stable',
+    workspaceFolder: '.',
+    mocha: {
+      ui: 'tdd',
+      timeout: 20000
+    }
+  }
+]);