diff --git a/src/promptforge/testing/results.py b/src/promptforge/testing/results.py
new file mode 100644
index 0000000..0b477dd
--- /dev/null
+++ b/src/promptforge/testing/results.py
@@ -0,0 +1,33 @@
+from dataclasses import dataclass
+from typing import Dict, List, Optional
+
+
+@dataclass
+class TestResult:
+    success: bool
+    response: str
+    metrics: "TestMetrics"
+    error: Optional[str] = None
+
+
+@dataclass
+class ComparisonResult:
+    prompt_name: str
+    total_runs: int
+    successful_runs: int
+    failed_runs: int
+    avg_latency_ms: float
+    min_latency_ms: float
+    max_latency_ms: float
+    avg_tokens: float
+    avg_cost: float
+    success_rate: float
+    all_metrics: List["TestMetrics"]
+
+
+@dataclass
+class TestReport:
+    test_id: str
+    timestamp: str
+    results: Dict[str, ComparisonResult]
+    summary: Dict[str, float]