chore: refactor and add components integration tests (#3607)

* improve inegration tests

* add fixes

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/tests/integration/flows/test_basic_prompting.py

@@ -0,0 +1,22 @@
+import pytest
+
+from langflow.components.inputs import ChatInput
+from langflow.components.outputs import ChatOutput
+from langflow.components.prompts import PromptComponent
+from langflow.graph import Graph
+from langflow.schema.message import Message
+from tests.integration.utils import run_flow
+
+
+@pytest.mark.asyncio
+async def test_simple_no_llm():
+    graph = Graph()
+    input = graph.add_component(ChatInput())
+    output = graph.add_component(ChatOutput())
+    component = PromptComponent(template="This is the message: {var1}", var1="")
+    prompt = graph.add_component(component)
+    graph.add_component_edge(input, ("message", "var1"), prompt)
+    graph.add_component_edge(prompt, ("prompt", "input_value"), output)
+    outputs = await run_flow(graph, run_input="hello!")
+    assert isinstance(outputs["message"], Message)
+    assert outputs["message"].text == "This is the message: hello!"