ecking default param for getSamplerParameter");

    testCases = [
      { pname: gl.TEXTURE_WRAP_S,  defaultParam: gl.REPEAT },
      { pname: gl.TEXTURE_WRAP_T,  defaultParam: gl.REPEAT },
      { pname: gl.TEXTURE_WRAP_R,  defaultParam: gl.REPEAT },
      { pname: gl.TEXTURE_MIN_FILTER,  defaultParam: gl.NEAREST_MIPMAP_LINEAR },
      { pname: gl.TEXTURE_MAG_FILTER,  defaultParam: gl.LINEAR },
      { pname: gl.TEXTURE_COMPARE_MODE,  defaultParam: gl.NONE },
      { pname: gl.TEXTURE_COMPARE_FUNC,  defau