Angular2 and Karma Issue - karma-jasmine

Question

I have a problem with tests - when running multiple tests one of them fails, but when I isolate them and run one at the time, they all pass. Tests are basic placeholders (I'm working on seed project) and typically look like this:
import {inject, injectAsync, TestComponentBuilder, beforeEachProviders} from 'angular2/testing'
import {describe, ddescribe, it, iit, expect} from 'angular2/testing'
import {provide} from 'angular2/core'
import {PeopleComponent} from './people.component'
describe('PeopleComponent', () => {
beforeEachProviders(() => []);
it('should ...', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
return tcb.createAsync(PeopleComponent).then((fixture) => {
fixture.detectChanges();
});
}));
});
When I change describe to ddescribe in any of the tests, they pass. I can't figure out why. Any ideas?
Full Error trace is below:
Chrome 47.0.2526 (Windows 10 0.0.0) DebugDirective should compile in component template FAILED
Failed: The selector "#root0" did not match any elements
Error: The selector "#root0" did not match any elements
at new BaseException (C:/~/node_modules/angular2/bundles/angular2.dev.js:8080:21)
at DomRenderer_.createRootHostView (C:/~/node_modules/angular2/bundles/angular2.dev.js:15248:15)
at AppViewManager_.createRootHostView (C:/~/node_modules/angular2/bundles/angular2.dev.js:11265:52)
at C:/~/node_modules/angular2/bundles/angular2.dev.js:14531:46
at Zone.run (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:138:17)
at Zone.run (C:/~/node_modules/angular2/bundles/testing.dev.js:2544:30)
at zoneBoundFn (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:111:19)
at lib$es6$promise$$internal$$tryCatch (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1511:16)
at lib$es6$promise$$internal$$invokeCallback (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1523:17)
at lib$es6$promise$$internal$$publish (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1494:11)
at C:/~/node_modules/angular2/bundles/angular2-polyfills.js:243:5
at microtask (C:/~/node_modules/angular2/bundles/testing.dev.js:2557:15)
at Zone.run (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:138:17)
at Zone.run (C:/~/node_modules/angular2/bundles/testing.dev.js:2544:30)
at zoneBoundFn (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:111:19)
at lib$es6$promise$asap$$flush (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1305:9)
Failed: Cannot read property 'hostView' of undefined
TypeError: Cannot read property 'hostView' of undefined
at new ComponentFixture_ (C:/~/node_modules/angular2/bundles/testing.dev.js:2047:97)
at C:/~/node_modules/angular2/bundles/testing.dev.js:2145:16
at Zone.run (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:138:17)
at Zone.run (C:/~/node_modules/angular2/bundles/testing.dev.js:2544:30)
at zoneBoundFn (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:111:19)
at lib$es6$promise$$internal$$tryCatch (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1511:16)
at lib$es6$promise$$internal$$invokeCallback (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1523:17)
at lib$es6$promise$$internal$$publish (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1494:11)
at C:/~/node_modules/angular2/bundles/angular2-polyfills.js:243:5
at microtask (C:/~/node_modules/angular2/bundles/testing.dev.js:2557:15)
at Zone.run (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:138:17)
at Zone.run (C:/~/node_modules/angular2/bundles/testing.dev.js:2544:30)
at zoneBoundFn (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:111:19)
at lib$es6$promise$asap$$flush (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1305:9)
Failed: Cannot read property 'detectChanges' of undefined
TypeError: Cannot read property 'detectChanges' of undefined
at C:/~/dist/scripts/core/components/people/people.component.spec.js:17:32
at C:/~/dist/scripts/core/components/people/people.component.spec.js:17:32
at Zone.run (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:138:17)
at Zone.run (C:/~/node_modules/angular2/bundles/testing.dev.js:2544:30)
at zoneBoundFn (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:111:19)
at lib$es6$promise$$internal$$tryCatch (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1511:16)
at lib$es6$promise$$internal$$invokeCallback (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1523:17)
at lib$es6$promise$$internal$$publish (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1494:11)
at C:/~/node_modules/angular2/bundles/angular2-polyfills.js:243:5
at microtask (C:/~/node_modules/angular2/bundles/testing.dev.js:2557:15)
at Zone.run (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:138:17)
at Zone.run (C:/~/node_modules/angular2/bundles/testing.dev.js:2544:30)
at zoneBoundFn (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:111:19)
at lib$es6$promise$asap$$flush (C:/~/node_modules/angular2/bundles/angular2-polyfills.js:1305:9)
Chrome 47.0.2526 (Windows 10 0.0.0): Executed 16 of 16 (1 FAILED) (0.396 secs / 0.167 secs)