public void ToString_error()
{
Graph1 g = new Graph1();
g.AddNode("Kyiv");
g.AddNode("Lviv");
Assert.AreEqual("Kyiv Lviv ", g.ToString());
}
public void AddNode_error()
{
Graph1 g = new Graph1();
g.AddNode("Kyiv");
g.AddNode("Lviv");
g.AddNode("Donetsk");
Assert.AreEqual(3, g.nodes.Length);
}
public void AddNode_exception_error()
{
Graph1 g = new Graph1();
Assert.Throws(typeof(ArgumentException), () => g.AddNode(""));
}