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Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
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Tests.startUnit = function () {
  var canvas = document.getElementById('gl');
  var gl = wrapGLContext(getGLContext(canvas));
  return [gl];
}

Tests.setup = function(gl) {
  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);
  var texCubeMap = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_CUBE_MAP, texCubeMap);
  return [gl]
}

Tests.teardown = function(gl,tex,texCubeMap) {
  gl.bindTexture(gl.TEXTURE_2D, null);
  gl.deleteTexture(tex);
  gl.bindTexture(gl.TEXTURE_CUBE_MAP, null);
  gl.deleteTexture(texCubeMap);
}

Tests.testTexSubImage2D = function(gl) {
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2,2,0,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]));
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, 1,1,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, 2,1,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0,0,0,0,0]));
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, 1,2,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0,0,0,0,0]));
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 1,0, 1,1,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,1, 1,1,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 1,1, 1,1,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
  gl.texImage2D(gl.TEXTURE_2D, 1,gl.RGBA, 1,1,0,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
  gl.texSubImage2D(gl.TEXTURE_2D, 1, 0,0, 1,1,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
  var valid_targets = [
    gl.TEXTURE_2D,
    gl.TEXTURE_CUBE_MAP_POSITIVE_X,
    gl.TEXTURE_CUBE_MAP_NEGATIVE_X,
    gl.TEXTURE_CUBE_MAP_POSITIVE_Y,
    gl.TEXTURE_CUBE_MAP_NEGATIVE_Y,
    gl.TEXTURE_CUBE_MAP_POSITIVE_Z,
    gl.TEXTURE_CUBE_MAP_NEGATIVE_Z
  ];
  valid_targets.forEach(function(t) {
    assertOk(function(){
        gl.texImage2D(t, 0, gl.RGBA, 1,1,0,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
        gl.texSubImage2D(t, 0, 0,0, 1,1,gl.RGBA,gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
    });
  });
}

Tests.endUnit = function(gl) {
}

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<canvas id="gl" width="16" height="16"></canvas>
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