Enable linting on test/ folder

package.json

@@ -47,10 +47,10 @@
     "esbuild-demo-server-watch": "node bin/esbuild.mjs --demo-server --watch",
     "test": "npm run test-unit",
     "posttest": "npm run lint",
-    "lint": "eslint --max-warnings 0 src/ addons/ demo/",
+    "lint": "eslint --max-warnings 0 src/ addons/ demo/ test/",
     "lint-changes": "node ./bin/lint_changes.js",
     "lint-changes-fix": "node ./bin/lint_changes.js --fix",
-    "lint-fix": "eslint --fix src/ addons/ demo/",
+    "lint-fix": "eslint --fix src/ addons/ demo/ test/",
     "lint-api": "eslint --config eslint.config.typings.mjs --max-warnings 0 typings/",
     "test-unit": "node ./bin/test_unit.js",
     "test-unit-slow-tests": "npm run test-unit | grep \"ms)\"",

test/playwright/SharedRendererTests.ts

@@ -1012,7 +1012,7 @@ export function injectSharedRendererTests(ctx: ISharedRendererTestContext): void
       await ctx.value.proxy.writeln('\x1b[31;42;7m\u{E0B4} red fg green bg inverse\x1b[0m');
       await ctx.value.proxy.writeln('\x1b[32;41;7m\u{E0B4} green fg red bg inverse\x1b[0m');
       await ctx.value.proxy.selectAll();
-      await pollFor(ctx.value.page, () => getCellColor(ctx.value, 1, 1), [255,255,255,255]);
+      await pollFor(ctx.value.page, () => getCellColor(ctx.value, 1, 1), [255, 255, 255, 255]);
       await pollFor(ctx.value.page, () => getCellColor(ctx.value, 1, 2), [230, 128, 128, 255]);
       await pollFor(ctx.value.page, () => getCellColor(ctx.value, 1, 3), [128, 230, 128, 255]);
       await pollFor(ctx.value.page, () => getCellColor(ctx.value, 1, 4), [128, 230, 128, 255]);
@@ -1397,9 +1397,7 @@ export function injectSharedRendererTestsStandalone(ctx: ISharedRendererTestCont
  * @param row The 1-based row index to get the color for.
  */
 async function getCellColor(ctx: ITestContext, col: number, row: number, position: CellColorPosition = CellColorPosition.CENTER): Promise<[red: number, green: number, blue: number, alpha: number]> {
-  if (!frameDetails) {
-    frameDetails = await getFrameDetails(ctx);
-  }
+  frameDetails ??= await getFrameDetails(ctx);
   switch (position) {
     case CellColorPosition.CENTER:
       return getCellColorInner(frameDetails, col, row);

test/playwright/TestUtils.ts

@@ -46,19 +46,17 @@ class EventEmitter<T, U = void> {
   private _disposed: boolean = false;
 
   public get event(): IEvent<T, U> {
-    if (!this._event) {
-      this._event = (listener: (arg1: T, arg2: U) => any) => {
-        this._listeners.add(listener);
-        const disposable = {
-          dispose: () => {
-            if (!this._disposed) {
-              this._listeners.delete(listener);
-            }
+    this._event ??= (listener: (arg1: T, arg2: U) => any) => {
+      this._listeners.add(listener);
+      const disposable = {
+        dispose: () => {
+          if (!this._disposed) {
+            this._listeners.delete(listener);
           }
-        };
-        return disposable;
+        }
       };
-    }
+      return disposable;
+    };
     return this._event;
   }
 
@@ -525,9 +523,7 @@ interface IPollForOptions<T> {
 }
 
 export async function pollFor<T>(page: playwright.Page, evalOrFn: string | (() => MaybeAsync<T>), val: T, preFn?: () => Promise<void>, options?: IPollForOptions<T>): Promise<void> {
-  if (!options) {
-    options = {};
-  }
+  options ??= {};
   options.stack ??= new Error().stack;
   if (preFn) {
     await preFn();
@@ -551,9 +547,7 @@ export async function pollFor<T>(page: playwright.Page, evalOrFn: string | (() =
   }
 
   if (!equalityCheck) {
-    if (options.maxDuration === undefined) {
-      options.maxDuration = 2000;
-    }
+    options.maxDuration ??= 2000;
     if (options.maxDuration <= 0) {
       deepStrictEqual(result, val, ([
         `pollFor max duration exceeded.`,