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cogl_texture_new_from_data lets you specify a source format for the users given data, and an internal format which the user wants the GPU to see. This unit test verifies that the users data is premultiplied, un-premultiplied or left alone for a number of (source format, internal format) pairs. cogl_texture_set_region allows specifying a source format, and the internal format is determined from the texture being updated. As above we test a number of format pairs and check Cogl is converting data correctly. The test verifies that if the user allows COGL_FORMAT_ANY for the internal_format then by default Cogl will choose a premultipled format for RGBA textures. Note: Currently this only tests cogl_texture_new_from_data and cogl_texture_set_region, we should also test cogl_texture_new_from_file, cogl_texture_new_from_bitmap and cogl_texture_new_from_foreign.