ERATION, message: "level is 0, width is not a multiple of 4" },
      { level: 0, width: 4, height: 4,
        expectation: gl.NO_ERROR, message: "is valid" },
      { level: 1, width: 1, height: 1,
        expectation: gl.INVALID_OPERATION, message: "implied base mip 2x2 is invalid" },
      { level: 1, width: 1, height: 2,
        expectation: gl.INVALID_OPERATION, message: "implied base mip 2x4 is invalid" },
      { level: 1, width: 2, height: 1,
        expectation: gl.INVALID_OPERATION, message: "impl