cleanup generator code, use helper pkg to load and generate test cases with

test_generators/epoch_processing/main.py

@@ -1,3 +1,5 @@
+from typing import Callable, Iterable
+
 from eth2spec.test.epoch_processing import (
     test_process_crosslinks,
     test_process_registry_updates
@@ -5,7 +7,6 @@ from eth2spec.test.epoch_processing import (
 
 from gen_base import gen_runner, gen_suite, gen_typing
 from gen_from_tests.gen import generate_from_tests
-from typing import Callable, Iterable
 from preset_loader import loader
 from eth2spec.phase0 import spec
 

test_generators/operations/main.py

@@ -1,3 +1,5 @@
+from typing import Callable, Iterable
+
 from eth2spec.test.block_processing import (
     test_process_attestation,
     test_process_attester_slashing,
@@ -8,9 +10,29 @@ from eth2spec.test.block_processing import (
     test_process_voluntary_exit
 )
 
-from gen_base import gen_runner
+from gen_base import gen_runner, gen_suite, gen_typing
+from gen_from_tests.gen import generate_from_tests
+from preset_loader import loader
+from eth2spec.phase0 import spec
+
+
+def create_suite(operation_name: str, config_name: str, get_cases: Callable[[], Iterable[gen_typing.TestCase]]) \
+        -> Callable[[str], gen_typing.TestSuiteOutput]:
+    def suite_definition(configs_path: str) -> gen_typing.TestSuiteOutput:
+        presets = loader.load_presets(configs_path, config_name)
+        spec.apply_constants_preset(presets)
+
+        return ("%s_%s" % (operation_name, config_name), operation_name, gen_suite.render_suite(
+            title="%s operation" % operation_name,
+            summary="Test suite for %s type operation processing" % operation_name,
+            forks_timeline="testing",
+            forks=["phase0"],
+            config=config_name,
+            runner="operations",
+            handler=operation_name,
+            test_cases=get_cases()))
+    return suite_definition
 
-from suite_creator import generate_from_tests, create_suite
 
 if __name__ == "__main__":
     gen_runner.run_generator("operations", [