 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: "implied base mip 4x2 is invalid" },
      { level: 1, width: 2, height: 2,
        expectation: gl.NO_ERROR, message: "implied base mip 4x4 is valid" },
      { level: 2, width: 1, 