public void testIOWithEqualXValues() throws IOException {
double[] expectedXValues = new double[]{0, 1, 2, 3, 4, 5};
double[] expectedY1Values = new double[]{0, 1, 4, 9, 16, 25};
double[] expectedY2Values = new double[]{0, 1, 2, 3, 5, 8};
double[] expectedY3Values = new double[]{0.5, 0.4, 0.3, 0.2, 0.1, 0.0};
DiagramGraph[] expectedGraphs = new DefaultDiagramGraph[]{
new DefaultDiagramGraph("x", expectedXValues, "y1", expectedY1Values),
new DefaultDiagramGraph("x", expectedXValues, "y2", expectedY2Values),
new DefaultDiagramGraph("x", expectedXValues, "y3", expectedY3Values)
};
testIO(expectedGraphs);
}