Cover beta health continuity and readiness boundaries (Refs #149)

tests/unit/beta-evaluation.test.ts

@@ -152,6 +152,44 @@ describe('beta requirement evaluation', () => {
         expect(m.values.r0).toBe(0);
     });
 
+    it.each([
+        { minutes: 2, gap: 60_005 },
+        { minutes: 2.5, gap: 60_048 },
+        { minutes: 2.5, gap: 90_000 }
+    ])(
+        'preserves a satisfied healthy-minute requirement after a $gap ms gap',
+        ({ minutes, gap }) => {
+            const plan = planWith('healthy-minutes', 'failure-budget');
+            const m = emptyMetrics();
+            const previous = minutes * 60_000;
+            for (let at = 0; at <= previous; at += 30_000) applySample(plan, m, at, true);
+            expect(m.values.r0).toBe(minutes);
+            expect(evaluateRequirements(plan, m, 0).every((r) => r.passed)).toBe(true);
+
+            applySample(plan, m, previous + gap, true);
+
+            expect(m.values.r0).toBeCloseTo(minutes + gap / 60_000);
+            expect(m.wasHealthy).toBe(true);
+            expect(m.outages).toBe(0);
+            expect(evaluateRequirements(plan, m, 0).every((r) => r.passed)).toBe(true);
+        }
+    );
+
+    it('resets a satisfied healthy-minute requirement on an unhealthy sample within the freshness window', () => {
+        const plan = planWith('healthy-minutes', 'failure-budget');
+        const m = emptyMetrics();
+        applySample(plan, m, 0, true);
+        applySample(plan, m, 60_000, true);
+        expect(evaluateRequirements(plan, m, 0)[0].passed).toBe(true);
+
+        applySample(plan, m, 90_000, false);
+
+        expect(m.values.r0).toBe(0);
+        expect(m.wasHealthy).toBe(false);
+        expect(m.outages).toBe(1);
+        expect(evaluateRequirements(plan, m, 0)[0].passed).toBe(false);
+    });
+
     it('excludes monitoring gaps from healthy time and requires explicit manual sign-off', () => {
         const plan = planWith('healthy-minutes', 'failure-budget', 'manual');
         const m = emptyMetrics();