public void T_GetFirstNode()
{
// Arrange
Cell cell = new Cell();
Cell cell2 = new Cell();
cell.Value = '1';
cell2.Value = '1';
GraphNode graphNodeBgn = new GraphNode(cell);
GraphNode graphNodeEnd = new GraphNode(cell2);
GraphArc graphArc = new GraphArc(graphNodeBgn, graphNodeEnd);
// Act
GraphNode getFirstNode = graphArc.GetFirstNode();
// Assert
Assert.AreEqual(getFirstNode, graphNodeBgn);
}