Add unittests for agent.py

[gpsandhu23]

Adds unittests for agent.py in the newly created tests/graphs/test_agent.py file, enhancing the test coverage for the TARS project.

• Setup and Initialization: Implements a setUp method to initialize AgentManager before each test.
• Testing Valid and Invalid Inputs: Adds tests for process_user_task method with both valid and invalid inputs, ensuring it handles inputs as expected.
• Testing Utility Methods: Includes tests for define_prompt and load_all_tools methods, verifying their functionality and output.
• Type and Exception Assertions: Utilizes isInstance, assertTrue, and assertRaises assertions to validate method outputs and exception handling.

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[sweep-ai[bot]]

Sweep: PR Review

tests/graphs/test_agent.py

The pull request adds a new test class TestAgentManager with methods to test various functionalities of the AgentManager class, ensuring proper handling of valid and invalid inputs, and verifying the return types and contents of specific methods.

Sweep Found These Issues

• The test_define_prompt method assumes the existence of a ChatPromptTemplate class or type, which is not imported or defined in the provided code, potentially causing a NameError.
https://github.com/gpsandhu23/TARS/blob/edac031dc6906a10f5fd95feeec488f5f5ca4e39/tests%2Fgraphs%2Ftest_agent.py#L21 [View Diff](https://github.com/gpsandhu23/TARS/pull/53/files#diff-f7235a93d09da9924e3bf968bf7786f007b367d4a0ce67871c352c5f6c8f4baaR21)

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