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) threw exception TypeError: Argument 1 ('program') to WebGLRenderingContext.getActiveAttrib must be an instance of WebGLProgram.
PASS getError was expected value: NO_ERROR :
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) threw exception TypeError: Argument 1 ('program') to WebGLRenderingContext.getActiveUniform must be an instance of WebGLProgram.
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