Add unit tests for NodeTemplate validation and dependency resolution

- Introduced tests to validate error handling for empty node names, identifiers, and non-unique next node identifiers in the NodeTemplate model.
- Added tests to ensure correct retrieval of dependent strings from node inputs, including validation for non-string inputs.

Author: NiveditJain

state-manager/tests/unit/with_database/test_graph_template copy.py

@@ -0,0 +1,98 @@
+import pytest
+from app.models.node_template_model import NodeTemplate, Unites
+
+def test_invalid_node_template(app_started):
+    """Test invalid node template"""
+    with pytest.raises(ValueError) as exc_info:
+        NodeTemplate(
+            node_name="",
+            namespace="test_namespace",
+            identifier="node1",
+            inputs={},
+            next_nodes=None,
+            unites=None
+        )
+    assert "Node name cannot be empty" in str(exc_info.value)
+
+    with pytest.raises(ValueError) as exc_info:
+        NodeTemplate(
+            node_name="test_node",
+            namespace="test_namespace",
+            identifier="",
+            inputs={},
+            next_nodes=None,
+            unites=None
+        )
+    assert "Node identifier cannot be empty" in str(exc_info.value)
+
+    with pytest.raises(ValueError) as exc_info:
+        NodeTemplate(
+            node_name="test_node",
+            namespace="test_namespace",
+            identifier="node1",
+            inputs={},
+            next_nodes=["", "node2"],
+            unites=None
+        )
+    assert "Next node identifier cannot be empty" in str(exc_info.value)
+
+    with pytest.raises(ValueError) as exc_info:
+        NodeTemplate(
+            node_name="test_node",
+            namespace="test_namespace",
+            identifier="node1",
+            inputs={},
+            next_nodes=["node1", "node1"],
+            unites=None
+        )
+    assert "Next node identifier node1 is not unique" in str(exc_info.value)
+
+    with pytest.raises(ValueError) as exc_info:
+        NodeTemplate(
+            node_name="test_node",
+            namespace="test_namespace",
+            identifier="node1",
+            inputs={},
+            next_nodes=["node2"],
+            unites=Unites(identifier="")
+        )
+    assert "Unites identifier cannot be empty" in str(exc_info.value)
+
+def test_get_dependent_strings(app_started):
+    """Test get dependent strings"""
+    node_template = NodeTemplate(
+        node_name="test_node",
+        namespace="test_namespace",
+        identifier="node1",
+        inputs={"input1": "${{node2.outputs.output1}}"},
+        next_nodes=None,
+        unites=None
+    )
+    dependent_strings = node_template.get_dependent_strings()
+    assert len(dependent_strings) == 1
+    assert dependent_strings[0].get_identifier_field() == [("node2", "output1")]
+
+    node_template = NodeTemplate(
+        node_name="test_node",
+        namespace="test_namespace",
+        identifier="node1",
+        inputs={"input1": "${{node2.outputs.output1}}", "input2": "${{node3.outputs.output2}}"},
+        next_nodes=None,
+        unites=None
+    )
+    dependent_strings = node_template.get_dependent_strings()
+    assert len(dependent_strings) == 2
+    assert ("node2", "output1") in dependent_strings[0].get_identifier_field()
+    assert ("node3", "output2") in dependent_strings[1].get_identifier_field()
+
+    with pytest.raises(ValueError) as exc_info:
+        node_template = NodeTemplate(
+            node_name="test_node",
+            namespace="test_namespace",
+            identifier="node1",
+            inputs={"input1": 1},
+            next_nodes=None,
+            unites=None
+        )
+        dependent_strings = node_template.get_dependent_strings()
+    assert "Input 1 is not a string" in str(exc_info.value)