Test that cube incomplete textures can not be used as FBO attachments

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

TEST COMPLETE: 4 PASS, 0 FAIL

PASS getError was expected value: NO_ERROR : Should be no errors after attaching cube map face.
Cubemap has 1 missing face, so framebuffer should not be complete.
PASS gl.checkFramebufferStatus(gl.FRAMEBUFFER) is gl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT

Missing face is added, so framebuffer should become complete.
PASS gl.checkFramebufferStatus(gl.FRAMEBUFFER) is gl.FRAMEBUFFER_COMPLETE
PASS successfullyParsed is true

TEST COMPLETE