michael@0: function getGl() {
michael@0:   var c = document.createElement("canvas");
michael@0:   var gl = c.getContext("experimental-webgl");
michael@0:   assert_true(!!gl, "Should be able to get a context.");
michael@0:   return gl;
michael@0: }
michael@0: 
michael@0: function shouldGenerateGLError(cx, glError, fn) {
michael@0:   test(function() {
michael@0:     fn();
michael@0:     assert_equals(cx.getError(), glError);
michael@0:   }, "Calling " + fn + " should generate a " + glError + " error.");
michael@0: }