Testing each element of the public API

# Constructor

- [ ] `audioElement` throwing exceptions
- [ ] options
- [ ] `waveformOverviewReady`

# Segments

- [ ] `addSegment`
- [ ] `getSegments`

# Time

- [x] `getCurrentTime`

# Zoom

- [ ] `zoomIn`
- [ ] `zoomOut`
- [ ] `setZoom`
- [ ] `getZoom`