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High-quality tests for api_utils/sse.py (minimal mocking).
Focus: Test real SSE generation logic with minimal mocks.
Note: Functions use time.time() but we verify structure/format, not exact timestamps.
"""
import json
def test_generate_sse_chunk_basic():
"""
Test scenario: Generate basic SSE data chunk
Strategy: Pure function test, verify output format and structure
"""
from api_utils.sse import generate_sse_chunk
result = generate_sse_chunk(delta="Hello", req_id="req123", model="gemini-1.5-pro")
# Verify SSE format
assert isinstance(result, str)
assert result.startswith("data: ")
assert result.endswith("\n\n")
# Extract and parse JSON
json_part = result[6:-2] # Remove "data: " prefix and "\n\n" suffix
chunk_data = json.loads(json_part)
# Verify structure
assert chunk_data["id"] == "chatcmpl-req123"
assert chunk_data["object"] == "chat.completion.chunk"
assert chunk_data["model"] == "gemini-1.5-pro"
assert "created" in chunk_data
assert isinstance(chunk_data["created"], int)
# Verify choices
assert len(chunk_data["choices"]) == 1
choice = chunk_data["choices"][0]
assert choice["index"] == 0
assert choice["delta"]["content"] == "Hello"
assert choice["finish_reason"] is None
def test_generate_sse_chunk_empty_delta():
"""
Test scenario: Generate SSE chunk with empty delta
Verify: Can handle empty string
"""
from api_utils.sse import generate_sse_chunk
result = generate_sse_chunk(delta="", req_id="req456", model="gemini-2.0-flash-exp")
json_part = result[6:-2]
chunk_data = json.loads(json_part)
assert chunk_data["choices"][0]["delta"]["content"] == ""
assert chunk_data["model"] == "gemini-2.0-flash-exp"
def test_generate_sse_chunk_unicode():
"""
Test scenario: Generate SSE chunk containing Unicode characters
Verify: Correctly handle Unicode characters
"""
from api_utils.sse import generate_sse_chunk
result = generate_sse_chunk(
delta="hello world", req_id="req789", model="test-model"
)
json_part = result[6:-2]
chunk_data = json.loads(json_part)
assert chunk_data["choices"][0]["delta"]["content"] == "hello world"
def test_generate_sse_chunk_special_characters():
"""
Test scenario: Generate SSE chunk containing special characters
Verify: Correctly escape quotes, newlines, etc.
"""
from api_utils.sse import generate_sse_chunk
delta_with_quotes = 'She said "hello" and left.'
result = generate_sse_chunk(delta=delta_with_quotes, req_id="req101", model="test")
json_part = result[6:-2]
chunk_data = json.loads(json_part)
assert chunk_data["choices"][0]["delta"]["content"] == delta_with_quotes
def test_generate_sse_stop_chunk_default_reason():
"""
Test scenario: Generate SSE chunk with default stop reason
Verify: finish_reason is "stop", includes [DONE] marker
"""
from api_utils.sse import generate_sse_stop_chunk
result = generate_sse_stop_chunk(req_id="req202", model="gemini-1.5-pro")
# Verify includes two data: chunks
assert result.count("data:") == 2
assert "data: [DONE]" in result
assert result.endswith("\n\n")
# Extract first JSON chunk (stop chunk)
lines = result.split("\n")
first_data_line = None
for line in lines:
if line.startswith("data:") and not line.startswith("data: [DONE]"):
first_data_line = line[6:]
break
assert first_data_line is not None
chunk_data = json.loads(first_data_line)
# Verify structure
assert chunk_data["id"] == "chatcmpl-req202"
assert chunk_data["object"] == "chat.completion.chunk"
assert chunk_data["model"] == "gemini-1.5-pro"
assert chunk_data["choices"][0]["delta"] == {}
assert chunk_data["choices"][0]["finish_reason"] == "stop"
assert "usage" not in chunk_data # Should not include usage when not provided
def test_generate_sse_stop_chunk_custom_reason():
"""
Test scenario: Generate SSE chunk with custom stop reason
Verify: finish_reason is custom value
"""
from api_utils.sse import generate_sse_stop_chunk
result = generate_sse_stop_chunk(
req_id="req303", model="gemini-2.0-flash-exp", reason="length"
)
lines = result.split("\n")
for line in lines:
if line.startswith("data:") and not line.startswith("data: [DONE]"):
chunk_data = json.loads(line[6:])
assert chunk_data["choices"][0]["finish_reason"] == "length"
break
def test_generate_sse_stop_chunk_with_usage():
"""
Test scenario: Generate stop chunk containing usage statistics
Verify: usage field correctly included
"""
from api_utils.sse import generate_sse_stop_chunk
usage_stats = {"prompt_tokens": 100, "completion_tokens": 50, "total_tokens": 150}
result = generate_sse_stop_chunk(
req_id="req404", model="test-model", reason="stop", usage=usage_stats
)
lines = result.split("\n")
for line in lines:
if line.startswith("data:") and not line.startswith("data: [DONE]"):
chunk_data = json.loads(line[6:])
assert "usage" in chunk_data
assert chunk_data["usage"] == usage_stats
assert chunk_data["usage"]["prompt_tokens"] == 100
assert chunk_data["usage"]["completion_tokens"] == 50
assert chunk_data["usage"]["total_tokens"] == 150
break
def test_generate_sse_stop_chunk_with_empty_usage():
"""
Test scenario: Generate stop chunk with empty usage dict
Verify: Empty dict treated as falsy, not included (correct behavior)
"""
from api_utils.sse import generate_sse_stop_chunk
result = generate_sse_stop_chunk(
req_id="req505", model="test-model", reason="stop", usage={}
)
lines = result.split("\n")
for line in lines:
if line.startswith("data:") and not line.startswith("data: [DONE]"):
chunk_data = json.loads(line[6:])
# Empty dict is falsy, should not include usage field
assert "usage" not in chunk_data
break
def test_generate_sse_error_chunk_default_type():
"""
Test scenario: Generate SSE chunk with default error type
Verify: error_type is "server_error"
"""
from api_utils.sse import generate_sse_error_chunk
result = generate_sse_error_chunk(
message="Internal error occurred", req_id="req606"
)
assert isinstance(result, str)
assert result.startswith("data: ")
assert result.endswith("\n\n")
json_part = result[6:-2]
error_chunk = json.loads(json_part)
# Verify error structure
assert "error" in error_chunk
error = error_chunk["error"]
assert error["message"] == "Internal error occurred"
assert error["type"] == "server_error"
assert error["param"] is None
assert error["code"] == "req606"
def test_generate_sse_error_chunk_custom_type():
"""
Test scenario: Generate SSE chunk with custom error type
Verify: error_type parameter used correctly
"""
from api_utils.sse import generate_sse_error_chunk
result = generate_sse_error_chunk(
message="Invalid API key", req_id="req707", error_type="authentication_error"
)
json_part = result[6:-2]
error_chunk = json.loads(json_part)
assert error_chunk["error"]["type"] == "authentication_error"
assert error_chunk["error"]["message"] == "Invalid API key"
def test_generate_sse_error_chunk_unicode_message():
"""
Test scenario: Error message contains Unicode characters
Verify: Correctly handle Unicode characters
"""
from api_utils.sse import generate_sse_error_chunk
result = generate_sse_error_chunk(message="Processing failed", req_id="req808")
json_part = result[6:-2]
error_chunk = json.loads(json_part)
assert error_chunk["error"]["message"] == "Processing failed"
def test_sse_format_consistency():
"""
Test scenario: Verify output format consistency across all SSE functions
Verify: All start with "data: " and end with "\n\n"
"""
from api_utils.sse import (
generate_sse_chunk,
generate_sse_error_chunk,
generate_sse_stop_chunk,
)
chunk = generate_sse_chunk(delta="test", req_id="req", model="model")
stop = generate_sse_stop_chunk(req_id="req", model="model")
error = generate_sse_error_chunk(message="error", req_id="req")
# Verify format consistency
assert chunk.startswith("data: ")
assert error.startswith("data: ")
# stop chunk contains two data: chunks, but also starts with data:
assert stop.startswith("data: ")
assert chunk.endswith("\n\n")
assert error.endswith("\n\n")
assert stop.endswith("\n\n")
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