Resolver Resolution Test Utils (#9)

rialto/jobs/decorators/test_utils.py

@@ -17,7 +17,9 @@
 import importlib
 import typing
 from contextlib import contextmanager
-from unittest.mock import patch
+from unittest.mock import patch, create_autospec, MagicMock
+from rialto.jobs.decorators.resolver import Resolver, ResolverException
+from rialto.jobs.decorators.job_base import JobBase
 
 
 def _passthrough_decorator(*args, **kwargs) -> typing.Callable:
@@ -58,3 +60,45 @@ def disable_job_decorators(module) -> None:
         yield
 
     importlib.reload(module)
+
+
+def resolver_resolves(spark, job: JobBase) -> bool:
+    """
+    Checker method for your dependency resoultion.
+
+    If your job's dependencies are all defined and resolvable, returns true.
+    Otherwise, throws an exception.
+
+    :param spark: SparkSession object.
+    :param job: Job to try and resolve.
+
+    :return: bool, True if job can be resolved
+    """
+
+    class SmartStorage:
+        def __init__(self):
+            self._storage = Resolver._storage.copy()
+            self._call_stack = []
+
+        def __setitem__(self, key, value):
+            self._storage[key] = value
+
+        def keys(self):
+            return self._storage.keys()
+
+        def __getitem__(self, func_name):
+            if func_name in self._call_stack:
+                raise ResolverException(f"Circular Dependence on {func_name}!")
+
+            self._call_stack.append(func_name)
+
+            real_method = self._storage[func_name]
+            fake_method = create_autospec(real_method)
+            fake_method.side_effect = lambda *args, **kwargs: self._call_stack.remove(func_name)
+
+            return fake_method
+
+    with patch("rialto.jobs.decorators.resolver.Resolver._storage", SmartStorage()):
+        job().run(reader=MagicMock(), run_date=MagicMock(), spark=spark)
+
+    return True

tests/jobs/test_job/dependency_tests_job.py

@@ -0,0 +1,51 @@
+from rialto.jobs.decorators import job, datasource
+
+
+@datasource
+def a():
+    return 1
+
+
+@datasource
+def b(a):
+    return a + 1
+
+
+@datasource
+def c(a, b):
+    return a + b
+
+
+@job
+def ok_dependency_job(c):
+    return c + 1
+
+
+@datasource
+def d(a, circle_1):
+    return circle_1 + a
+
+
+@datasource
+def circle_1(circle_2):
+    return circle_2 + 1
+
+
+@datasource
+def circle_2(circle_1):
+    return circle_1 + 1
+
+
+@job
+def circular_dependency_job(d):
+    return d + 1
+
+
+@job
+def missing_dependency_job(a, x):
+    return x + a
+
+
+@job
+def default_dependency_job(run_date, spark, config, dependencies, table_reader, feature_loader):
+    return 1

tests/jobs/test_test_utils.py

@@ -11,12 +11,13 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-
+import pytest
 
 import rialto.jobs.decorators as decorators
 import tests.jobs.test_job.test_job as test_job
+import tests.jobs.test_job.dependency_tests_job as dependency_tests_job
 from rialto.jobs.decorators.resolver import Resolver
-from rialto.jobs.decorators.test_utils import disable_job_decorators
+from rialto.jobs.decorators.test_utils import disable_job_decorators, resolver_resolves
 
 
 def test_raw_dataset_patch(mocker):
@@ -46,3 +47,27 @@ def test_custom_name_job_function_patch(mocker):
         assert test_job.custom_name_job_function() == "custom_job_name_return"
 
         spy_dec.assert_not_called()
+
+
+def test_resolver_resolves_ok_job(spark):
+    assert resolver_resolves(spark, dependency_tests_job.ok_dependency_job)
+
+
+def test_resolver_resolves_default_dependency(spark):
+    assert resolver_resolves(spark, dependency_tests_job.default_dependency_job)
+
+
+def test_resolver_resolves_fails_circular_dependency(spark):
+    with pytest.raises(Exception) as exc_info:
+        assert resolver_resolves(spark, dependency_tests_job.circular_dependency_job)
+
+    assert exc_info is not None
+    assert str(exc_info.value) == "Circular Dependence on circle_1!"
+
+
+def test_resolver_resolves_fails_missing_dependency(spark):
+    with pytest.raises(Exception) as exc_info:
+        assert resolver_resolves(spark, dependency_tests_job.missing_dependency_job)
+
+    assert exc_info is not None
+    assert str(exc_info.value) == "x declaration not found!"