CleverThis Engineering
197 lines
8.0 KiB
Gherkin
197 lines
8.0 KiB
Gherkin
Feature: LangGraph Core Functionality
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As a developer
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I want to use LangGraph for complex graph-based agent workflows
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So that I can build reactive agent systems with proper state management
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Background:
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Given I have imported the necessary modules
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And I have a clean graph test environment
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Scenario: Initialize basic LangGraph with minimal configuration
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Given I have a GraphConfig with name "test_graph"
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When I create a LangGraph instance
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Then the graph should be initialized successfully
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And the graph should have "start" and "end" nodes
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And the state manager should be initialized
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Scenario: Initialize LangGraph with custom state class
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Given I have a custom state class
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And I have a GraphConfig with custom state class
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When I create a LangGraph instance with the custom state
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Then the state manager should use the custom state class
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Scenario: Initialize LangGraph with checkpointing enabled
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Given I have a temporary checkpoint directory
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And I have a GraphConfig with checkpointing enabled
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When I create a LangGraph instance
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Then the state manager should have checkpointing enabled
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Scenario: Initialize LangGraph with provided scheduler
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Given I have an AsyncIO scheduler for graph
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And I have a GraphConfig with name "scheduled_graph"
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When I create a LangGraph instance with the scheduler
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Then the graph should use the provided scheduler
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Scenario: Initialize LangGraph with existing stream router
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Given I have a ReactiveStreamRouter instance
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And I have a GraphConfig with name "routed_graph"
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When I create a LangGraph instance with the router
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Then the graph should use the provided router
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Scenario: Validate graph with invalid entry point
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Given I have a GraphConfig with invalid entry point "nonexistent"
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When I try to create a LangGraph instance
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Then it should raise a ValueError with message "Entry point 'nonexistent' not found"
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Scenario: Validate graph with invalid edge source
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Given I have a GraphConfig with name "invalid_edge_graph"
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And I add an edge from "nonexistent" to "end"
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When I try to create a LangGraph instance
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Then it should raise a ValueError with message "Edge source 'nonexistent' not found"
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Scenario: Validate graph with invalid edge target
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Given I have a GraphConfig with name "invalid_target_graph"
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And I add an edge from "start" to "nonexistent"
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When I try to create a LangGraph instance
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Then it should raise a ValueError with message "Edge target 'nonexistent' not found"
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Scenario: Detect cycles in graph
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Given I have a GraphConfig with cyclic edges
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When I create a LangGraph instance
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Then the graph should detect cycles
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Scenario: Find parallel execution groups
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Given I have a GraphConfig with parallel execution enabled
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And I have nodes that can execute in parallel
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When I create a LangGraph instance
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Then the graph should identify parallel groups
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Scenario: Find reachable nodes from entry point
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Given I have a GraphConfig with disconnected nodes
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When I create a LangGraph instance
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Then the graph should warn about unreachable nodes
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Scenario: Execute graph with message input
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Given I have a GraphConfig with agent nodes
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And I have created a LangGraph instance
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When I execute the graph with message input
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Then the state should be updated with messages
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Scenario: Execute graph while already running
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Given I have a GraphConfig with name "busy_graph"
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And I have created a LangGraph instance
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And the graph is already running
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When I try to execute the graph again
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Then it should raise a RuntimeError with message "Graph is already running"
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Scenario: Add node to existing graph
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Given I have a GraphConfig with basic nodes
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And I have created a LangGraph instance
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When I add a new node "processor"
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Then the node should be added successfully
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And the graph should be re-analyzed
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Scenario: Add duplicate node to graph
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Given I have a GraphConfig with a node "processor"
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And I have created a LangGraph instance
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When I try to add a duplicate node "processor"
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Then it should raise a ValueError with message "Node 'processor' already exists"
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Scenario: Add edge to existing graph
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Given I have a GraphConfig with nodes "start", "middle", "end"
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And I have created a LangGraph instance
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When I add an edge from "middle" to "end"
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Then the edge should be added successfully
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And the graph should be re-analyzed
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Scenario: Add edge with invalid source
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Given I have a GraphConfig with basic nodes
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And I have created a LangGraph instance
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When I try to add an edge from "invalid" to "end"
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Then it should raise a ValueError with message "Source node 'invalid' not found"
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Scenario: Add edge with invalid target
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Given I have a GraphConfig with basic nodes
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And I have created a LangGraph instance
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When I try to add an edge from "start" to "invalid"
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Then it should raise a ValueError with message "Target node 'invalid' not found"
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Scenario: Get current graph state
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Given I have a GraphConfig with state management
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And I have created a LangGraph instance
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When I get the current state
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Then I should receive the current GraphState
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Scenario: Get execution history
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Given I have a GraphConfig with tracking enabled
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And I have created a LangGraph instance
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And I have executed some nodes
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When I get the execution history
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Then I should receive a copy of the execution history
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Scenario: Visualize graph in mermaid format
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Given I have a GraphConfig with various node types
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And I have created a LangGraph instance
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When I visualize the graph in "mermaid" format
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Then I should receive valid mermaid diagram syntax
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Scenario: Visualize graph in unsupported format
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Given I have a GraphConfig with basic nodes
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And I have created a LangGraph instance
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When I visualize the graph in "invalid" format
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Then I should receive "Format invalid not supported"
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Scenario: Register node executor function
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Given I have a GraphConfig with a node "worker"
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And I have created a LangGraph instance
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When the node executor is registered
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Then the executor function should be stored in the router
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Scenario: Execute node with state updates
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Given I have a GraphConfig with an agent node
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And I have created a LangGraph instance
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When I execute a node that returns updates
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Then the state should be updated accordingly
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And the execution history should be recorded
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Scenario: Analyze graph with topological levels
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Given I have a GraphConfig with hierarchical structure
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When I create a LangGraph instance
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Then the topological levels should be computed correctly
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Scenario: Check node execution prerequisites
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Given I have a GraphConfig with dependencies
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And I have created a LangGraph instance
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When I check if a node can execute
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Then it should verify all predecessors are executed
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Scenario: Get next nodes with conditional edges
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Given I have a GraphConfig with conditional routing
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And I have created a LangGraph instance
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When I get next nodes for execution
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Then it should evaluate edge conditions
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Scenario: Create control streams for graph
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Given I have a GraphConfig with stream control
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And I have created a LangGraph instance
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When I check control and state streams
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Then control and state streams should be created
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Scenario: Execute nodes in parallel mode
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Given I have a GraphConfig with parallel execution
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And I have created a LangGraph instance
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When I execute multiple nodes in parallel
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Then they should run concurrently
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Scenario: Execute graph from specific node
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Given I have a GraphConfig with multiple paths
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And I have created a LangGraph instance
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When I execute from a specific node
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Then execution should follow the correct path
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Scenario: Handle node shape mapping for visualization
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Given I have a GraphConfig with all node types
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And I have created a LangGraph instance
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When I get node shapes for visualization
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Then each node type should have the correct shape
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