Adopt C4 terminology: Rename Dependency -> Relationship

diagrams/c4/__init__.py

@@ -121,7 +121,7 @@ def SystemBoundary(name, **kwargs):
     return Cluster(name, graph_attr=graph_attributes)
 
 
-def Dependency(label="", **kwargs):
+def Relationship(label="", **kwargs):
     edge_attribtues = {"style": "dashed", "color": "gray60"}
     if label:
         edge_attribtues.update({"label": _format_edge_label(label)})

tests/test_c4.py

@@ -5,7 +5,7 @@ import unittest
 
 from diagrams import Diagram
 from diagrams import setcluster, setdiagram
-from diagrams.c4 import Person, Container, Database, System, SystemBoundary, Dependency
+from diagrams.c4 import Person, Container, Database, System, SystemBoundary, Relationship
 
 
 class C4Test(unittest.TestCase):
@@ -26,8 +26,6 @@ class C4Test(unittest.TestCase):
             container = Container("container", "Java application", "The application.")
             database = Database("database", "Oracle database", "Stores information.")
 
-            person >> container >> database
-
     def test_external_nodes(self):
         with Diagram(name=self.name, show=False):
             external_person = Person("person", external=True)
@@ -38,22 +36,27 @@ class C4Test(unittest.TestCase):
             system = System("system", "The internal system.")
             system_without_description = System("unknown")
 
-            system >> system_without_description >> external_system
-
     def test_edges(self):
         with Diagram(name=self.name, show=False):
-            c1 = Container("container1", "type", "description")
-            c2 = Container("container2", "type", "description")
+            c1 = Container("container1")
+            c2 = Container("container2")
+
+            c1 >> c2
+
+    def test_edges_with_labels(self):
+        with Diagram(name=self.name, show=False):
+            c1 = Container("container1")
+            c2 = Container("container2")
 
-            c1 >> Dependency("depends on") >> c2
-            c1 << Dependency("is dependend on") << c2
+            c1 >> Relationship("depends on") >> c2
+            c1 << Relationship("is depended on by") << c2
 
     def test_edge_without_constraint(self):
         with Diagram(name=self.name, show=False):
             s1 = System("system 1")
             s2 = System("system 2")
 
-            s1 >> Dependency(constraint="False") >> s2
+            s1 >> Relationship(constraint="False") >> s2
 
     def test_cluster(self):
         with Diagram(name=self.name, show=False):