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); }