test: add test for app usecase

__tests__/app/usecases/cleanup-legacy-test.test.ts

@@ -0,0 +1,79 @@
+import {Inputs} from '@app/inputs'
+import {cleanupLegacyStacks} from '@app/usecases/cleanup-legacy-stacks'
+import {Logger} from '@entities/lib'
+import {LocalWorkspace} from '@pulumi/pulumi/automation'
+import {subHours} from 'date-fns'
+import {mock} from 'jest-mock-extended'
+import {assertInfos} from '../../fixtures/assertions'
+
+const testWorkspace = mock<LocalWorkspace>()
+const testLogger = mock<Logger>()
+
+jest.mock('@pulumi/pulumi/automation', () => {
+  return {
+    LocalWorkspace: {
+      async create() {
+        return testWorkspace
+      }
+    }
+  }
+})
+
+jest.mock('@actions/core', () => {
+  return {
+    info(message: string) {
+      testLogger.info(message)
+    }
+  }
+})
+
+describe('cleanupLegacyStacks', () => {
+  const now = new Date('2021-01-01 12:00:00')
+  const lastUpdate = subHours(now, 3).toISOString()
+
+  beforeEach(() => {
+    jest.useFakeTimers()
+    jest.setSystemTime(now)
+    testWorkspace.listStacks.mockResolvedValue([
+      {
+        name: 'dev-1',
+        current: false,
+        updateInProgress: false,
+        lastUpdate,
+        resourceCount: 1
+      }
+    ])
+  })
+
+  it('cleans up legacy stacks defined by the inputs', async () => {
+    const config = `
+      policies:
+        clean-dev:
+          match:
+            name: 'dev*'
+          ttl:
+            hours: 2
+    `
+    const inputs: Inputs = {
+      preview: true,
+      verbose: true,
+      config,
+      workDir: '.'
+    }
+
+    await cleanupLegacyStacks(inputs)
+
+    assertInfos(testLogger, [
+      'checking stack dev-1',
+      '  checking policy clean-dev',
+      '    [fail] checked [updateInProgress=false]',
+      '    [fail] checked stack age [2021-01-01T09:00:00.000Z] against ttl [2 hours]',
+      '    [fail] checked name [dev-1] against pattern [dev*]',
+      '  [result] legacy stack - marking for cleanup',
+      '[PREVIEW] Found 1 legacy dev stack(s) out of 1 total',
+      '[PREVIEW] Destroyed legacy stack: dev-1',
+      '[PREVIEW] Removed legacy stack: dev-1',
+      '[PREVIEW] Removed 1 legacy stacks, 0 remaining'
+    ])
+  })
+})