public void Node_SetNodeAttribute_SetsNodeAttribute()
{
// given:
var node = new Node("Node");
var nullattr = new Null("nullattr");
// require:
Assert.AreEqual(0, node.GetSrcObjectCount());
Assert.AreEqual(0, node.GetDstObjectCount());
Assert.AreEqual(0, node.GetSrcPropertyCount());
Assert.AreEqual(0, node.GetDstPropertyCount());
Assert.AreEqual(0, node.GetNodeAttributeCount());
Assert.AreEqual(null, node.GetNodeAttribute());
Assert.AreEqual(-1, node.GetDefaultNodeAttributeIndex());
Assert.AreEqual(0, nullattr.GetSrcObjectCount());
Assert.AreEqual(0, nullattr.GetDstObjectCount());
Assert.AreEqual(0, nullattr.GetSrcPropertyCount());
Assert.AreEqual(0, nullattr.GetDstPropertyCount());
Assert.AreEqual(0, nullattr.GetNodeCount());
// when:
node.SetNodeAttribute(nullattr);
// then:
Assert.AreEqual(1, node.GetSrcObjectCount());
Assert.AreEqual(nullattr, node.GetSrcObject(0));
Assert.AreEqual(0, node.GetDstObjectCount());
Assert.AreEqual(0, node.GetSrcPropertyCount());
Assert.AreEqual(0, node.GetDstPropertyCount());
Assert.AreEqual(1, node.GetNodeAttributeCount());
Assert.AreEqual(nullattr, node.GetNodeAttribute());
Assert.AreEqual(0, node.GetDefaultNodeAttributeIndex());
Assert.AreEqual(nullattr, node.GetNodeAttributeByIndex(0));
Assert.AreEqual(0, nullattr.GetSrcObjectCount());
Assert.AreEqual(1, nullattr.GetDstObjectCount());
Assert.AreEqual(node, nullattr.GetDstObject(0));
Assert.AreEqual(0, nullattr.GetSrcPropertyCount());
Assert.AreEqual(0, nullattr.GetDstPropertyCount());
Assert.AreEqual(1, nullattr.GetNodeCount());
Assert.AreEqual(node, nullattr.GetNode());
Assert.AreEqual(node, nullattr.GetNode(0));
}