diff --git a/packages/c0py-core/tests/fidelity.test.ts b/packages/c0py-core/tests/fidelity.test.ts
new file mode 100644
index 0000000..a35db22
--- /dev/null
+++ b/packages/c0py-core/tests/fidelity.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import { evaluateFidelity } from "../src/verification/fidelity";
+
+describe("fidelity release gate", () => {
+  it("passes a complete clone vector", () => {
+    expect(
+      evaluateFidelity({
+        assets: 1,
+        responsiveCoverage: 1,
+        routeCoverage: 1,
+        interactionCoverage: 1,
+        workflowCoverage: 1,
+        networkContractParity: 1,
+        accessibilityPass: true,
+        runtimeErrorCount: 0,
+        productionBuildPass: true,
+      }),
+    ).toEqual({ passed: true, failures: [] });
+  });
+
+  it("fails rather than averaging away missing behavior", () => {
+    const result = evaluateFidelity({
+      geometry: 0.999,
+      assets: 1,
+      responsiveCoverage: 1,
+      routeCoverage: 1,
+      interactionCoverage: 0.8,
+      workflowCoverage: 1,
+      networkContractParity: 1,
+      accessibilityPass: true,
+      runtimeErrorCount: 0,
+      productionBuildPass: true,
+    });
+
+    expect(result.passed).toBe(false);
+    expect(result.failures.join(" ")).toMatch(/interactionCoverage/);
+  });
+});