80% of them do for different reasons:
- the browser may silently freeze (no error reported in the dev tools nor in Karma)
- the browser may be very slow, causing dozens or hundreds of tests to fail
- an error may be raised due to a failing XHR:
Mobile Safari 9.0.0 (iOS 9.0.0) ERROR
error@/home/travis/build/angular/angular/node_modules/systemjs/dist/system.src.js:1028:25
onreadystatechange@/home/travis/build/angular/angular/node_modules/systemjs/dist/system.src.js:1036:18
run@/home/travis/build/angular/angular/node_modules/zone.js/dist/zone-microtask.js:120:22
zoneBoundFn@/home/travis/build/angular/angular/node_modules/zone.js/dist/zone-microtask.js:93:22
This is reproducible in Sauce Labs, in Browserstack or with a local simulator.
In other cases, all tests are successful.
80% of them do for different reasons:
This is reproducible in Sauce Labs, in Browserstack or with a local simulator.
In other cases, all tests are successful.