Tests generation of synthetic and real GL errors

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

PASS getError was expected value: NO_ERROR : 
Testing getActiveAttrib
PASS context.getActiveAttrib(null, 2) is null
PASS getError was expected value: INVALID_VALUE : 
PASS getError was expected value: NO_ERROR : 
PASS context.getActiveAttrib(program, 2) is null
PASS getError was expected value: INVALID_VALUE : 
PASS getError was expected value: NO_ERROR : 
Testing getActiveUniform
PASS context.getActiveUniform(null, 0) is null
PASS getError was expected value: INVALID_VALUE : 
PASS getError was expected value: NO_ERROR : 
PASS context.getActiveUniform(program, 50) is null
PASS getError was expected value: INVALID_VALUE : 
PASS getError was expected value: NO_ERROR : 
Testing attempts to manipulate the default framebuffer
PASS context.bindFramebuffer(context.FRAMEBUFFER, null) is undefined.
PASS getError was expected value: NO_ERROR : 
PASS context.framebufferRenderbuffer(context.FRAMEBUFFER, context.DEPTH_ATTACHMENT, context.RENDERBUFFER, null) is undefined.
PASS getError was expected value: INVALID_OPERATION : 
PASS getError was expected value: NO_ERROR : 
PASS context.framebufferTexture2D(context.FRAMEBUFFER, context.COLOR_ATTACHMENT0, context.TEXTURE_2D, null, 0) is undefined.
PASS getError was expected value: INVALID_OPERATION : 
PASS getError was expected value: NO_ERROR : 
PASS successfullyParsed is true

TEST COMPLETE