fix(chromium): handle various exception values in pageerror (#2293)

src/chromium/crProtocolHelper.ts

@@ -23,7 +23,7 @@ import * as util from 'util';
 
 export function getExceptionMessage(exceptionDetails: Protocol.Runtime.ExceptionDetails): string {
   if (exceptionDetails.exception)
-    return exceptionDetails.exception.description || exceptionDetails.exception.value;
+    return exceptionDetails.exception.description || String(exceptionDetails.exception.value);
   let message = exceptionDetails.text;
   if (exceptionDetails.stackTrace) {
     for (const callframe of exceptionDetails.stackTrace.callFrames) {

test/page.spec.js

@@ -560,6 +560,37 @@ describe('Page.Events.PageError', function() {
     ]);
     expect(error.stack).toContain('myscript.js');
   });
+  it('should handle odd values', async ({page}) => {
+    const cases = [
+      [null, 'null'],
+      [undefined, 'undefined'],
+      [0, '0'],
+      ['', ''],
+    ];
+    for (const [value, message] of cases) {
+      const [error] = await Promise.all([
+        page.waitForEvent('pageerror'),
+        page.evaluate(value => setTimeout(() => { throw value; }, 0), value),
+      ]);
+      expect(error.message).toBe(FFOX ? 'uncaught exception: ' + message : message);
+    }
+  });
+  it.fail(FFOX)('should handle object', async ({page}) => {
+    // Firefox just does not report this error.
+    const [error] = await Promise.all([
+      page.waitForEvent('pageerror'),
+      page.evaluate(() => setTimeout(() => { throw {}; }, 0)),
+    ]);
+    expect(error.message).toBe(CHROMIUM ? 'Object' : '[object Object]');
+  });
+  it.fail(FFOX)('should handle window', async ({page}) => {
+    // Firefox just does not report this error.
+    const [error] = await Promise.all([
+      page.waitForEvent('pageerror'),
+      page.evaluate(() => setTimeout(() => { throw window; }, 0)),
+    ]);
+    expect(error.message).toBe(CHROMIUM ? 'Window' : '[object Window]');
+  });
 });
 
 describe('Page.setContent', function() {