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Tests.startUnit = function () {
    var canvas = document.getElementById('gl');
    var gl = getGLContext(canvas);
    var buf = gl.createBuffer();
    var ebuf = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, buf);
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebuf);
    return [gl, buf, ebuf];
}

Tests.testBufferSubData = function(gl, buf, ebuf) {
    var data = [0,0,0,0, 1,0,0,0, 0,1,0,0];
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(data), gl.STATIC_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array([1,2,3,4]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Float32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 32, new Float32Array([1,1,1,1]));
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12*4);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_USAGE), gl.STATIC_DRAW);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(data), gl.STREAM_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Float32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array([1,2,3,4]));
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12*4);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_USAGE), gl.STREAM_DRAW);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(data), gl.DYNAMIC_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Float32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array([1,2,3,4]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Int32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Int16Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Int8Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint8Array([1,1,1,1]));
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12*4);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_USAGE), gl.DYNAMIC_DRAW);

    gl.bufferData(gl.ARRAY_BUFFER, 12, gl.STATIC_DRAW);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_USAGE), gl.STATIC_DRAW);

    gl.bufferData(gl.ARRAY_BUFFER, 12*4, gl.STATIC_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array([1,2,3,4]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Float32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 32, new Float32Array([1,1,1,1]));
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12*4);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_USAGE), gl.STATIC_DRAW);
    gl.bufferData(gl.ARRAY_BUFFER, 12*4, gl.STREAM_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Float32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array([1,2,3,4]));
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12*4);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_USAGE), gl.STREAM_DRAW);
    gl.bufferData(gl.ARRAY_BUFFER, 12*4, gl.DYNAMIC_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Float32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array([1,2,3,4]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Int32Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Int16Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Int8Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint8Array([1,1,1,1]));
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12*4);
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_USAGE), gl.DYNAMIC_DRAW);

    gl.bufferData(gl.ARRAY_BUFFER, new Uint16Array(data), gl.STATIC_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Uint16Array([1,2,3,4]));
    gl.bufferData(gl.ARRAY_BUFFER, new Uint16Array(data), gl.STREAM_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Uint16Array([1,2,3,4]));
    gl.bufferData(gl.ARRAY_BUFFER, new Uint16Array(data), gl.DYNAMIC_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Uint16Array([1,2,3,4]));
    assertEquals(gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE), 12*2);
    throwError(gl, "array bufferSubData");
}
Tests.testBufferSubDataElement = function(gl, buf, ebuf) {
    var data = [0,0,0,0, 1,0,0,0, 0,1,0,0];
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(data), gl.STATIC_DRAW);
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Uint16Array([1,2,3,4]));
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(data), gl.STREAM_DRAW);
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Uint16Array([1,2,3,4]));
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(data), gl.DYNAMIC_DRAW);
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 16, new Uint16Array([1,1,1,1]));
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Uint16Array([1,2,3,4]));
    assertEquals(gl.getBufferParameter(gl.ELEMENT_ARRAY_BUFFER, gl.BUFFER_SIZE), 12*2);
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint8Array(data), gl.DYNAMIC_DRAW);
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 4, new Uint8Array([1,1,1,1]));
    gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Uint8Array([1,2,3,4]));
    assertEquals(gl.getBufferParameter(gl.ELEMENT_ARRAY_BUFFER, gl.BUFFER_SIZE), 12);
    throwError(gl, "element array bufferSubData");
}

Tests.endUnit = function(gl, buf, ebuf) {
    gl.deleteBuffer(buf);
    gl.deleteBuffer(ebuf);
}

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