Add a test for the examples so it's easier to test when they break

tests/test_examples/test_departments.py

@@ -0,0 +1,30 @@
+from examples import departments
+
+
+def test_departments():
+    result = departments.main()
+    assert not result.errors
+
+    deps = result.data["listDepartments"]
+    assert len(deps) == 1
+
+    employees = deps[0]["employees"]
+    assert len(employees) == 3
+
+    def employee_by_name(employees, name):
+        return [e for e in employees if e["name"] == name][0]
+
+    jason = employee_by_name(employees, "Jason")
+    carmen = employee_by_name(employees, "Carmen")
+    derek = employee_by_name(employees, "Derek")
+
+    # Jason is a manager
+    assert jason["teamSize"] == 2
+    assert carmen.get("teamSize") is None
+
+    # some sanity checks on optional fields,
+    # knowing what the test data is
+    assert jason.get("hiredOn") is None
+    assert carmen.get("hiredOn") is not None
+    assert carmen["salary"]["rating"] == "GS-9"
+    assert derek["salary"] is None