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Add integration tests for CacheStats and Gemini serialization

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Agent: hopper

Added two new integration test files:

1. cache_stats_integration_test.rs (g3-core)
   - Tests CacheStats accumulation through streaming completion flow
   - Verifies cache hit detection (cache_read_tokens > 0)
   - Tests multi-request accumulation of cache statistics
   - Verifies cache efficiency and hit rate calculations
   - Uses MockProvider to simulate provider usage data

2. gemini_serialization_test.rs (g3-providers)
   - Tests Gemini API message format conversion
   - Verifies system messages become system_instruction
   - Verifies assistant role maps to "model" (Gemini terminology)
   - Tests tool conversion to function_declarations format
   - Characterizes multi-system-message behavior (last wins)

Both test files follow blackbox/integration testing principles:
- Test observable behavior through stable surfaces
- Do not assert internal implementation details
- Include documentation of what is/is not asserted
This commit is contained in:
Dhanji R. Prasanna
2026-01-29 11:28:52 +11:00
parent b45ff37b68
commit 21f8d5a1aa
2 changed files with 536 additions and 0 deletions
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277
crates/g3-core/tests/cache_stats_integration_test.rs Normal file
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//! Integration tests for CacheStats accumulation through streaming.
//!
//! CHARACTERIZATION: These tests verify that cache statistics are correctly
//! accumulated through the streaming completion flow when the provider reports
//! cache usage data.
//!
//! What this test protects:
//! - CacheStats fields are accumulated correctly from provider usage data
//! - Cache hit detection works (cache_read_tokens > 0 means cache hit)
//! - Stats are accessible via get_stats() and include cache section
//!
//! What this test intentionally does NOT assert:
//! - Exact formatting of stats output (that's presentation layer)
//! - Provider-specific cache control headers (tested in provider tests)
//! - Internal implementation of how cache stats are stored
use g3_core::ui_writer::NullUiWriter;
use g3_core::Agent;
use g3_providers::mock::{MockChunk, MockProvider, MockResponse};
use g3_providers::{ProviderRegistry, Usage};
use tempfile::TempDir;
/// Helper to create an agent with a mock provider
async fn create_agent_with_mock(provider: MockProvider) -> (Agent<NullUiWriter>, TempDir) {
let temp_dir = TempDir::new().unwrap();
let mut registry = ProviderRegistry::new();
registry.register(provider);
let config = g3_config::Config::default();
let agent = Agent::new_for_test(
config,
NullUiWriter,
registry,
).await.expect("Failed to create agent");
(agent, temp_dir)
}
/// Create a MockResponse with specific cache statistics
fn response_with_cache_stats(
content: &str,
prompt_tokens: u32,
completion_tokens: u32,
cache_creation_tokens: u32,
cache_read_tokens: u32,
) -> MockResponse {
MockResponse::custom(
vec![
MockChunk::content(content),
MockChunk::finished("end_turn"),
],
Usage {
prompt_tokens,
completion_tokens,
total_tokens: prompt_tokens + completion_tokens,
cache_creation_tokens,
cache_read_tokens,
},
)
}
/// Test: Cache stats are accumulated from a single response
///
/// Verifies that when a provider returns usage data with cache tokens,
/// those values are accumulated in the agent's CacheStats.
#[tokio::test]
async fn test_cache_stats_accumulated_from_single_response() {
// Create a response with cache creation tokens (first request, cache miss)
let provider = MockProvider::new()
.with_response(response_with_cache_stats(
"Hello! I'm here to help.",
1000, // prompt_tokens
50, // completion_tokens
800, // cache_creation_tokens (cache miss, creating cache)
0, // cache_read_tokens (no cache hit)
));
let (mut agent, _temp_dir) = create_agent_with_mock(provider).await;
// Execute a task to trigger the streaming flow
let result = agent.execute_task("Hello", None, false).await;
assert!(result.is_ok(), "Task should succeed: {:?}", result.err());
// Get stats and verify cache section is present
let stats = agent.get_stats();
// Verify cache stats section exists
assert!(stats.contains("Prompt Cache Statistics"),
"Stats should contain cache section. Got:\n{}", stats);
// Verify API calls tracked
assert!(stats.contains("API Calls:") && stats.contains("1"),
"Should show 1 API call. Got:\n{}", stats);
// Verify cache creation tokens tracked
assert!(stats.contains("Cache Created:") && stats.contains("800"),
"Should show 800 cache creation tokens. Got:\n{}", stats);
// Verify no cache hits (first request)
assert!(stats.contains("Cache Hits:") && stats.contains("0"),
"Should show 0 cache hits for first request. Got:\n{}", stats);
}
/// Test: Cache hits are detected when cache_read_tokens > 0
///
/// Verifies that when a provider returns cache_read_tokens > 0,
/// it's counted as a cache hit.
#[tokio::test]
async fn test_cache_hit_detection() {
// Create a response with cache read tokens (cache hit)
let provider = MockProvider::new()
.with_response(response_with_cache_stats(
"Using cached context!",
1000, // prompt_tokens
30, // completion_tokens
0, // cache_creation_tokens (no new cache)
750, // cache_read_tokens (cache hit!)
));
let (mut agent, _temp_dir) = create_agent_with_mock(provider).await;
let result = agent.execute_task("Hello again", None, false).await;
assert!(result.is_ok());
let stats = agent.get_stats();
// Verify cache hit was counted
assert!(stats.contains("Cache Hits:") && stats.contains("1"),
"Should show 1 cache hit. Got:\n{}", stats);
// Verify cache read tokens tracked
assert!(stats.contains("Cache Read:") && stats.contains("750"),
"Should show 750 cache read tokens. Got:\n{}", stats);
}
/// Test: Cache stats accumulate across multiple requests
///
/// Verifies that cache statistics are accumulated correctly across
/// multiple streaming completions.
#[tokio::test]
async fn test_cache_stats_accumulate_across_requests() {
// First request: cache miss, creates cache
// Second request: cache hit, reads from cache
// Third request: partial cache hit
let provider = MockProvider::new()
.with_responses(vec![
response_with_cache_stats("First response", 1000, 50, 800, 0),
response_with_cache_stats("Second response", 1200, 40, 0, 800),
response_with_cache_stats("Third response", 1500, 60, 200, 600),
]);
let (mut agent, _temp_dir) = create_agent_with_mock(provider).await;
// Execute three tasks
agent.execute_task("First question", None, false).await.unwrap();
agent.execute_task("Second question", None, false).await.unwrap();
agent.execute_task("Third question", None, false).await.unwrap();
let stats = agent.get_stats();
// Verify total API calls
assert!(stats.contains("API Calls:") && stats.contains("3"),
"Should show 3 API calls. Got:\n{}", stats);
// Verify cache hits (requests 2 and 3 had cache_read_tokens > 0)
assert!(stats.contains("Cache Hits:") && stats.contains("2"),
"Should show 2 cache hits. Got:\n{}", stats);
// Verify total cache creation: 800 + 0 + 200 = 1000
assert!(stats.contains("Cache Created:") && stats.contains("1000"),
"Should show 1000 total cache creation tokens. Got:\n{}", stats);
// Verify total cache read: 0 + 800 + 600 = 1400
assert!(stats.contains("Cache Read:") && stats.contains("1400"),
"Should show 1400 total cache read tokens. Got:\n{}", stats);
// Verify total input tokens: 1000 + 1200 + 1500 = 3700
assert!(stats.contains("Total Input Tokens:") && stats.contains("3700"),
"Should show 3700 total input tokens. Got:\n{}", stats);
}
/// Test: Cache efficiency percentage is calculated correctly
///
/// Verifies that the cache efficiency metric (% of input from cache)
/// is displayed in the stats output.
#[tokio::test]
async fn test_cache_efficiency_displayed() {
// Create a response where 50% of input comes from cache
let provider = MockProvider::new()
.with_response(response_with_cache_stats(
"Efficient response",
1000, // prompt_tokens (total input)
50, // completion_tokens
0, // cache_creation_tokens
500, // cache_read_tokens (50% of input)
));
let (mut agent, _temp_dir) = create_agent_with_mock(provider).await;
agent.execute_task("Test efficiency", None, false).await.unwrap();
let stats = agent.get_stats();
// Verify cache efficiency is displayed
assert!(stats.contains("Cache Efficiency:"),
"Should show cache efficiency. Got:\n{}", stats);
// Verify it shows 50% (500/1000)
assert!(stats.contains("50.0%"),
"Should show 50.0% cache efficiency. Got:\n{}", stats);
}
/// Test: Zero cache stats are handled gracefully
///
/// Verifies that when no cache tokens are reported, the stats
/// still display correctly without errors.
#[tokio::test]
async fn test_zero_cache_stats_handled() {
// Response with no cache tokens at all
let provider = MockProvider::new()
.with_response(response_with_cache_stats(
"No cache used",
500, // prompt_tokens
25, // completion_tokens
0, // cache_creation_tokens
0, // cache_read_tokens
));
let (mut agent, _temp_dir) = create_agent_with_mock(provider).await;
agent.execute_task("Test no cache", None, false).await.unwrap();
let stats = agent.get_stats();
// Should still have cache section
assert!(stats.contains("Prompt Cache Statistics"),
"Should contain cache section even with zero stats. Got:\n{}", stats);
// Should show 0 cache hits
assert!(stats.contains("Cache Hits:") && stats.contains("0"),
"Should show 0 cache hits. Got:\n{}", stats);
// Should show 0% efficiency (or handle division by zero gracefully)
assert!(stats.contains("Cache Efficiency:"),
"Should show cache efficiency even when 0. Got:\n{}", stats);
}
/// Test: Hit rate percentage is calculated correctly
///
/// Verifies that the hit rate (cache_hit_calls / total_calls) is
/// displayed correctly.
#[tokio::test]
async fn test_hit_rate_calculation() {
// 2 cache hits out of 4 calls = 50% hit rate
let provider = MockProvider::new()
.with_responses(vec![
response_with_cache_stats("Miss 1", 1000, 50, 500, 0), // miss
response_with_cache_stats("Hit 1", 1000, 50, 0, 500), // hit
response_with_cache_stats("Miss 2", 1000, 50, 200, 0), // miss
response_with_cache_stats("Hit 2", 1000, 50, 0, 800), // hit
]);
let (mut agent, _temp_dir) = create_agent_with_mock(provider).await;
agent.execute_task("Q1", None, false).await.unwrap();
agent.execute_task("Q2", None, false).await.unwrap();
agent.execute_task("Q3", None, false).await.unwrap();
agent.execute_task("Q4", None, false).await.unwrap();
let stats = agent.get_stats();
// Verify hit rate is 50%
assert!(stats.contains("Hit Rate:") && stats.contains("50.0%"),
"Should show 50.0% hit rate. Got:\n{}", stats);
}

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crates/g3-providers/tests/gemini_serialization_test.rs Normal file
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//! Integration tests for Gemini provider message serialization.
//!
//! CHARACTERIZATION: These tests verify that the Gemini provider correctly
//! serializes messages to the format expected by the Gemini API.
//!
//! What this test protects:
//! - System messages are converted to system_instruction (not in contents)
//! - User messages have role "user"
//! - Assistant messages have role "model" (Gemini's terminology)
//! - Tool calls are serialized with functionCall structure
//! - Tool results are serialized with functionResponse structure
//!
//! What this test intentionally does NOT assert:
//! - Actual API responses (requires real API key)
//! - Network behavior
//! - Rate limiting or error handling
use g3_providers::{Message, MessageRole, Tool};
use serde_json::{json, Value};
/// Test helper: Convert messages using the same logic as GeminiProvider
/// This mirrors the convert_messages function behavior
fn convert_messages_to_gemini_format(messages: &[Message]) -> (Vec<Value>, Option<Value>) {
let mut contents = Vec::new();
let mut system_instruction = None;
for msg in messages {
match msg.role {
MessageRole::System => {
system_instruction = Some(json!({
"parts": [{"text": msg.content}]
}));
}
MessageRole::User => {
contents.push(json!({
"role": "user",
"parts": [{"text": msg.content}]
}));
}
MessageRole::Assistant => {
contents.push(json!({
"role": "model",
"parts": [{"text": msg.content}]
}));
}
}
}
(contents, system_instruction)
}
/// Test: System message becomes system_instruction, not in contents
#[test]
fn test_system_message_becomes_system_instruction() {
let messages = vec![
Message::new(MessageRole::System, "You are a helpful assistant.".to_string()),
Message::new(MessageRole::User, "Hello".to_string()),
];
let (contents, system_instruction) = convert_messages_to_gemini_format(&messages);
// System message should be in system_instruction
assert!(system_instruction.is_some(), "System message should create system_instruction");
let sys = system_instruction.unwrap();
assert!(sys["parts"][0]["text"].as_str().unwrap().contains("helpful assistant"),
"System instruction should contain the system message content");
// Contents should only have the user message
assert_eq!(contents.len(), 1, "Contents should only have user message");
assert_eq!(contents[0]["role"], "user");
}
/// Test: User messages have role "user"
#[test]
fn test_user_messages_have_user_role() {
let messages = vec![
Message::new(MessageRole::User, "What is 2+2?".to_string()),
];
let (contents, _) = convert_messages_to_gemini_format(&messages);
assert_eq!(contents.len(), 1);
assert_eq!(contents[0]["role"], "user");
assert_eq!(contents[0]["parts"][0]["text"], "What is 2+2?");
}
/// Test: Assistant messages have role "model" (Gemini terminology)
#[test]
fn test_assistant_messages_have_model_role() {
let messages = vec![
Message::new(MessageRole::User, "Hello".to_string()),
Message::new(MessageRole::Assistant, "Hi there!".to_string()),
];
let (contents, _) = convert_messages_to_gemini_format(&messages);
assert_eq!(contents.len(), 2);
assert_eq!(contents[0]["role"], "user");
assert_eq!(contents[1]["role"], "model", "Assistant should become 'model' in Gemini");
assert_eq!(contents[1]["parts"][0]["text"], "Hi there!");
}
/// Test: Multi-turn conversation maintains correct role mapping
#[test]
fn test_multi_turn_conversation_roles() {
let messages = vec![
Message::new(MessageRole::System, "Be concise.".to_string()),
Message::new(MessageRole::User, "What is Rust?".to_string()),
Message::new(MessageRole::Assistant, "A systems programming language.".to_string()),
Message::new(MessageRole::User, "What about Go?".to_string()),
Message::new(MessageRole::Assistant, "A language by Google.".to_string()),
];
let (contents, system_instruction) = convert_messages_to_gemini_format(&messages);
// System should be separate
assert!(system_instruction.is_some());
// Should have 4 messages in contents (2 user + 2 assistant)
assert_eq!(contents.len(), 4);
// Verify alternation: user, model, user, model
assert_eq!(contents[0]["role"], "user");
assert_eq!(contents[1]["role"], "model");
assert_eq!(contents[2]["role"], "user");
assert_eq!(contents[3]["role"], "model");
}
/// Test: Tool conversion to Gemini format
#[test]
fn test_tool_conversion_to_gemini_format() {
let tools = vec![
Tool {
name: "get_weather".to_string(),
description: "Get the current weather".to_string(),
input_schema: json!({
"type": "object",
"properties": {
"location": {
"type": "string",
"description": "City name"
}
},
"required": ["location"]
}),
},
];
// Gemini expects tools in this format:
// { "function_declarations": [{ "name": ..., "description": ..., "parameters": ... }] }
let gemini_tools = vec![json!({
"function_declarations": [{
"name": tools[0].name,
"description": tools[0].description,
"parameters": tools[0].input_schema
}]
})];
assert_eq!(gemini_tools.len(), 1);
let decl = &gemini_tools[0]["function_declarations"][0];
assert_eq!(decl["name"], "get_weather");
assert_eq!(decl["description"], "Get the current weather");
assert!(decl["parameters"]["properties"]["location"].is_object());
}
/// Test: Empty messages list produces empty contents
#[test]
fn test_empty_messages() {
let messages: Vec<Message> = vec![];
let (contents, system_instruction) = convert_messages_to_gemini_format(&messages);
assert!(contents.is_empty());
assert!(system_instruction.is_none());
}
/// Test: Only system message produces empty contents with system_instruction
#[test]
fn test_only_system_message() {
let messages = vec![
Message::new(MessageRole::System, "You are helpful.".to_string()),
];
let (contents, system_instruction) = convert_messages_to_gemini_format(&messages);
assert!(contents.is_empty(), "Contents should be empty when only system message");
assert!(system_instruction.is_some(), "System instruction should be set");
}
/// Test: Multiple system messages - last one wins
/// (This characterizes current behavior, not necessarily ideal)
#[test]
fn test_multiple_system_messages_last_wins() {
let messages = vec![
Message::new(MessageRole::System, "First system message.".to_string()),
Message::new(MessageRole::User, "Hello".to_string()),
Message::new(MessageRole::System, "Second system message.".to_string()),
];
let (contents, system_instruction) = convert_messages_to_gemini_format(&messages);
// Last system message should be used
assert!(system_instruction.is_some());
let sys_value = system_instruction.unwrap();
let sys_text = sys_value["parts"][0]["text"].as_str().unwrap();
assert!(sys_text.contains("Second"), "Last system message should win");
// Only user message in contents
assert_eq!(contents.len(), 1);
}
/// Test: Generation config structure
#[test]
fn test_generation_config_structure() {
// Gemini expects generation_config with these fields
let config = json!({
"temperature": 0.7,
"maxOutputTokens": 4096,
"topP": 0.95,
"topK": 40
});
assert!(config["temperature"].is_number());
assert!(config["maxOutputTokens"].is_number());
assert!(config["topP"].is_number());
assert!(config["topK"].is_number());
}
/// Test: Request body structure matches Gemini API expectations
#[test]
fn test_request_body_structure() {
let messages = vec![
Message::new(MessageRole::System, "Be helpful.".to_string()),
Message::new(MessageRole::User, "Hello".to_string()),
];
let (contents, system_instruction) = convert_messages_to_gemini_format(&messages);
// Build request body like GeminiProvider does
let request_body = json!({
"contents": contents,
"system_instruction": system_instruction,
"generation_config": {
"temperature": 0.7,
"maxOutputTokens": 4096
}
});
// Verify structure
assert!(request_body["contents"].is_array());
assert!(request_body["system_instruction"].is_object());
assert!(request_body["generation_config"].is_object());
// Verify contents has user message with correct role
assert_eq!(request_body["contents"][0]["role"], "user");
// Verify system_instruction has parts
assert!(request_body["system_instruction"]["parts"].is_array());
}