test: improve domain coverage

__tests__/entities/policies.test.ts

@@ -0,0 +1,19 @@
+import {isValidTTL} from '@entities/policies'
+
+describe('isValidTTL', () => {
+  it('returns true for valid TTL policies', () => {
+    expect(isValidTTL({days: 1})).toEqual(true)
+    expect(isValidTTL({hours: 1})).toEqual(true)
+    expect(isValidTTL({minutes: 1})).toEqual(true)
+  })
+
+  it('treats 0 time units as valid', () => {
+    expect(isValidTTL({days: 0})).toEqual(true)
+    expect(isValidTTL({hours: 0})).toEqual(true)
+    expect(isValidTTL({minutes: 0})).toEqual(true)
+  })
+
+  it('returns false for invalid TTL policies', () => {
+    expect(isValidTTL({})).toEqual(false)
+  })
+})

__tests__/usecases/checks/stack-age-check.test.ts

@@ -35,6 +35,16 @@ describe('StackAgeCheck', () => {
     })
   })
 
+  it('passes when the stack is exactly the age of the ttl policy', async () => {
+    const threeHoursAgo = sub(now, {hours: 3, minutes: 30})
+    const result = await check(stack(threeHoursAgo))
+    expect(result).toEqual({
+      isLegacy: false,
+      description:
+        'checked stack age [2021-01-01T08:30:00.000Z] against ttl [3 hours 30 minutes]'
+    })
+  })
+
   it('fails when the stack is older than the ttl policy', async () => {
     const fourHoursAgo = sub(now, {hours: 4})
     const result = await check(stack(fourHoursAgo))

__tests__/usecases/parse-policies.test.ts

@@ -5,7 +5,7 @@ describe('parsePolicies', () => {
   it('parses valid yaml', () => {
     const yaml = `
       policies:
-        clean-staging:
+        clean-dev:
           match:
             tags:
               environment: 'dev*'
@@ -20,7 +20,7 @@ describe('parsePolicies', () => {
     const policy = parsePolicies(yaml)
     expect(policy).toEqual([
       {
-        name: 'clean-staging',
+        name: 'clean-dev',
         match: {
           tags: [{pattern: 'dev*', tag: 'environment'}]
         },