Simplify custom Jest test runner

The custom Jest test runner was originally written to install the
required extensions for the CLI integration tests. This is no longer
necessary as of #3232, so
we can remove all code that deals with downloading VS Code and
installing extensions. The download of VS Code will now be handled by
the base `VSCodeTestRunner`.

extensions/ql-vscode/scripts/find-deadcode.ts

@@ -9,7 +9,7 @@ function ignoreFile(file: string): boolean {
     containsPath(".storybook", file) ||
     containsPath(join("src", "stories"), file) ||
     pathsEqual(
-      join("test", "vscode-tests", "jest-runner-installed-extensions.ts"),
+      join("test", "vscode-tests", "jest-runner-vscode-codeql-cli.ts"),
       file,
     ) ||
     basename(file) === "jest.config.ts" ||

extensions/ql-vscode/test/vscode-tests/activated-extension/jest.config.ts

@@ -4,7 +4,7 @@ import baseConfig from "../jest.config.base";
 
 const config: Config = {
   ...baseConfig,
-  runner: "<rootDir>/../jest-runner-installed-extensions.ts",
+  runner: "<rootDir>/../jest-runner-vscode-codeql-cli.ts",
   setupFilesAfterEnv: ["<rootDir>/jest.setup.ts"],
 };
 

extensions/ql-vscode/test/vscode-tests/cli-integration/jest.config.ts

@@ -4,7 +4,7 @@ import baseConfig from "../jest.config.base";
 
 const config: Config = {
   ...baseConfig,
-  runner: "<rootDir>/../jest-runner-installed-extensions.ts",
+  runner: "<rootDir>/../jest-runner-vscode-codeql-cli.ts",
   setupFilesAfterEnv: ["<rootDir>/jest.setup.ts"],
   // CLI integration tests call into the CLI and execute queries, so these are expected to take a lot longer
   // than the default 5 seconds.

extensions/ql-vscode/test/vscode-tests/jest-runner-vscode-codeql-cli.ts

@@ -0,0 +1,20 @@
+import type * as JestRunner from "jest-runner";
+import VSCodeTestRunner from "jest-runner-vscode";
+import { ensureCli } from "./ensureCli";
+
+export default class JestRunnerVscodeCodeqlCli extends VSCodeTestRunner {
+  async runTests(
+    tests: JestRunner.Test[],
+    watcher: JestRunner.TestWatcher,
+    onStart: JestRunner.OnTestStart,
+    onResult: JestRunner.OnTestSuccess,
+    onFailure: JestRunner.OnTestFailure,
+  ): Promise<void> {
+    // The CLI integration tests require the CLI to be available. We do not want to install the CLI
+    // when VS Code is already running because this will not give any feedback to the test runner. Instead,
+    // we'll download the CLI now and pass the path to the CLI to VS Code.
+    await ensureCli(true);
+
+    return super.runTests(tests, watcher, onStart, onResult, onFailure);
+  }
+}