Function assert_session_provider 

pub fn assert_session_provider(
    json: &Value,
    session_index: usize,
    expected_provider: &str,
) -> Result<()>

Assert that a specific session comes from the expected provider.

Example

let json = json!({
    "content": {
        "sessions": [
            {"source": "claude_code"},
            {"source": "gemini"}
        ]
    }
});

assertions::assert_session_provider(&json, 0, "claude_code").unwrap();
assertions::assert_session_provider(&json, 1, "gemini").unwrap();