BBitmap(BRect bounds, color_space colorSpace, bool acceptsViews,
		bool needsContiguous)
case 1:	acceptsViews = false, needsContiguous = false, valid bounds,
		different color spaces =>
		Bits() should be valid, BitsLength(), BytesPerRow() etc. should return
		the correct values.
TODO: ...

void SetBits(const void *data, int32 length, int32 offset,
			 color_space colorSpace)
case 1:	overwrite complete bitmap data, offset = 0, different color spaces,
		no row padding =>
		Bitmap should contain the correct data.
case 2:	overwrite complete bitmap data, offset = 0, different color spaces,
		row padding =>
		Bitmap should contain the correct data.
case 3:	overwrite bitmap data partially, offset = 0, different color spaces,
		no row padding =>
		Bitmap should contain the correct data.
case 4:	overwrite bitmap data partially, offset = 0, different color spaces,
		row padding =>
		Bitmap should contain the correct data.

status_t ImportBits(const BBitmap *bitmap)
case 1:	NULL bitmap =>
		Should return B_BAD_VALUE.
case 2:	bitmap with different Bounds() =>
		Should return B_BAD_VALUE.
case 3:	this and bitmap are properly initialized and have the same bounds,
		different color spaces =>
		Should set the data and return B_OK.