generalize helper for loading module from source (#2862)

api/tests/integration_tests/utils/child_class.py

@@ -0,0 +1,7 @@
+from tests.integration_tests.utils.parent_class import ParentClass
+
+
+class ChildClass(ParentClass):
+    def __init__(self, name: str):
+        super().__init__(name)
+        self.name = name

api/tests/integration_tests/utils/lazy_load_class.py

@@ -0,0 +1,7 @@
+from tests.integration_tests.utils.parent_class import ParentClass
+
+
+class LazyLoadChildClass(ParentClass):
+    def __init__(self, name: str):
+        super().__init__(name)
+        self.name = name

api/tests/integration_tests/utils/parent_class.py

@@ -0,0 +1,6 @@
+class ParentClass:
+    def __init__(self, name):
+        self.name = name
+
+    def get_name(self):
+        return self.name

api/tests/integration_tests/utils/test_module_import_helper.py

@@ -0,0 +1,32 @@
+import os
+
+from core.utils.module_import_helper import load_single_subclass_from_source, import_module_from_source
+from tests.integration_tests.utils.parent_class import ParentClass
+
+
+def test_loading_subclass_from_source():
+    current_path = os.getcwd()
+    module = load_single_subclass_from_source(
+        module_name='ChildClass',
+        script_path=os.path.join(current_path, 'child_class.py'),
+        parent_type=ParentClass)
+    assert module and module.__name__ == 'ChildClass'
+
+
+def test_load_import_module_from_source():
+    current_path = os.getcwd()
+    module = import_module_from_source(
+        module_name='ChildClass',
+        py_file_path=os.path.join(current_path, 'child_class.py'))
+    assert module and module.__name__ == 'ChildClass'
+
+
+def test_lazy_loading_subclass_from_source():
+    current_path = os.getcwd()
+    clz = load_single_subclass_from_source(
+        module_name='LazyLoadChildClass',
+        script_path=os.path.join(current_path, 'lazy_load_class.py'),
+        parent_type=ParentClass,
+        use_lazy_loader=True)
+    instance = clz('dify')
+    assert instance.get_name() == 'dify'