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Copyright (c) 2019 The Khronos Group Inc.
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Tests.startUnit = function () {
  var canvas = document.getElementById('gl');
  var gl = wrapGLContext(getGLContext(canvas));
  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);
  return [gl, tex];
}

Tests.testTexImage2D = function(gl) {
    var b = document.createElement('b');
    var div = document.createElement('div');
    var c = document.getElementById('c');
    assertOk("make texture",
         function() {gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_VALUE, "y + height > texture height",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 1, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_VALUE, "x + width > texture width",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_VALUE, "negative x",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, -1, 0, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_VALUE, "negative y",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, -1, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_VALUE, "negative level",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, -1, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertThrowNoGLError(gl, "bad element b",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGBA, gl.UNSIGNED_BYTE, b); });
    assertThrowNoGLError(gl, "bad element div",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGBA, gl.UNSIGNED_BYTE, div); });
    assertThrowNoGLError(gl, "no element",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGBA, gl.UNSIGNED_BYTE, 0); });
    assertThrowNoGLError(gl, "string as data",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0,0, 0, gl.RGBA, gl.UNSIGNED_BYTE, "foo"); });
    assertGLError(gl, gl.INVALID_ENUM, "bad target",
        function() {gl.texSubImage2D(gl.FLOAT, 0, 0,0, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertOk("good args",
         function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_OPERATION, "format not same as original",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGB, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_OPERATION, "type not same as original",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGBA, gl.UNSIGNED_SHORT_4_4_4_4, c); });
    assertOk("make texture RGB",
         function() {gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE, c); });
    assertOk("format same as original RGB",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGB, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_OPERATION, "format not same as original RGB",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGBA, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_OPERATION, "type not same as original RGB",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGB, gl.UNSIGNED_SHORT_5_6_5, c); });
    assertOk("make texture RGBA 4_4_4_4",
         function() {gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_SHORT_4_4_4_4, c); });
    assertOk("format same as original RGBA 4_4_4_4",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGBA, gl.UNSIGNED_SHORT_4_4_4_4, c); });
    assertGLError(gl, gl.INVALID_OPERATION, "format not same as original RGBA 4_4_4_4",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGB, gl.UNSIGNED_BYTE, c); });
    assertGLError(gl, gl.INVALID_OPERATION, "type not same as original RGBA 4_4_4_4",
        function() {gl.texSubImage2D(gl.TEXTURE_2D, 0, 0,0, gl.RGBA, gl.UNSIGNED_BYTE, c); });
}

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

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<style>canvas{ position:absolute; }</style>
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<canvas id="gl" width="16" height="16"></canvas>
<canvas id="c" width="16" height="16"></canvas>
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