wip: refactoring context to share base.

tests/execution/contexts/test_execution_contexts_graph.py

@@ -0,0 +1,59 @@
+from bonobo import Graph
+from bonobo.execution.contexts import GraphExecutionContext
+
+
+def raise_an_error(*args, **kwargs):
+    raise Exception('Careful, man, there\'s a beverage here!')
+
+
+def raise_an_unrecoverrable_error(*args, **kwargs):
+    raise Exception('You are entering a world of pain!')
+
+
+def test_lifecycle_of_empty_graph():
+    graph = Graph()
+    with GraphExecutionContext(graph) as context:
+        assert context.started
+        assert context.alive
+        assert not context.stopped
+    assert context.started
+    assert not context.alive
+    assert context.stopped
+    assert not context.xstatus
+
+
+def test_lifecycle_of_nonempty_graph():
+    graph = Graph([1, 2, 3], print)
+    with GraphExecutionContext(graph) as context:
+        assert context.started
+        assert context.alive
+        assert not context.stopped
+    assert context.started
+    assert not context.alive
+    assert context.stopped
+    assert not context.xstatus
+
+
+def test_lifecycle_of_graph_with_recoverable_error():
+    graph = Graph([1, 2, 3], raise_an_error, print)
+    with GraphExecutionContext(graph) as context:
+        assert context.started
+        assert context.alive
+        assert not context.stopped
+    assert context.started
+    assert not context.alive
+    assert context.stopped
+    assert not context.xstatus
+
+
+def test_lifecycle_of_graph_with_unrecoverable_error():
+    graph = Graph([1, 2, 3], raise_an_unrecoverrable_error, print)
+    with GraphExecutionContext(graph) as context:
+        assert context.started
+        assert context.alive
+        assert not context.stopped
+        context.loop()
+    assert context.started
+    assert not context.alive
+    assert context.stopped
+    assert not context.xstatus