1 files changed, 84 insertions, 0 deletions
diff --git a/src/onaptests/steps/base.py b/src/onaptests/steps/base.py
new file mode 100644
index 0000000..b32e6d3
--- /dev/null
+++ b/src/onaptests/steps/base.py
@@ -0,0 +1,84 @@
+from abc import ABC, abstractmethod
+from typing import List
+
+
+class BaseStep(ABC):
+    """Base step class."""
+
+    def __init__(self, cleanup: bool = False) -> None:
+        """Step initialization.
+
+        Args:
+            cleanup(bool, optional): Determines if cleanup action should be called.
+
+        """
+        self._steps: List["BaseStep"] = []
+        self._cleanup: bool = cleanup
+        self._parent: "BaseStep" = None
+
+    def add_step(self, step: "BaseStep") -> None:
+        """Add substep.
+
+        Add substep and mark step as a substep parent.
+
+        Args:
+            step (BaseStep): Step object
+        """
+        self._steps.append(step)
+        step._parent: "BaseStep" = self
+
+    @property
+    def parent(self) -> "BaseStep":
+        """Step parent.
+
+        If parent is not set the step is a root one.
+        """
+        return self._parent
+
+    @property
+    def is_root(self) -> bool:
+        """Is a root step.
+
+        Step is a root if has no parent
+
+        Returns:
+            bool: True if step is a root step, False otherwise
+
+        """
+        return self._parent is None
+
+    def execute(self) -> None:
+        """Step's action.
+
+        Run all substeps action before it's own action.
+        Override this method and remember to call `super().action()` before.
+
+        """
+        for step in self._steps:
+            step.execute()
+
+    def cleanup(self) -> None:
+        """Step's cleanup.
+
+        Not all steps has to have cleanup method
+
+        """
+        if self._cleanup:
+            for step in self._steps:
+                step.cleanup()
+
+
+class YamlTemplateBaseStep(BaseStep, ABC):
+    """Base YAML template step."""
+
+    @property
+    @abstractmethod
+    def yaml_template(self) -> dict:
+        """YAML template abstract property.
+
+        Every YAML template step need to implement that property.
+
+        Returns:
+            dict: YAML template
+
+        """