add tests to ensure workflow crons are unique and do not run at top of the hour

Author: sarahs

tests/unit/actions-workflows.js

@@ -19,6 +19,12 @@ function actionsUsedInWorkflow (workflow) {
     .map(key => get(workflow, key))
 }
 
+const scheduledWorkflows = workflows
+  .map(workflow => workflow.data.on.schedule)
+  .filter(Boolean)
+  .flat()
+  .map(schedule => schedule.cron)
+
 const allUsedActions = chain(workflows)
   .map(actionsUsedInWorkflow)
   .flatten()
@@ -38,4 +44,16 @@ describe('GitHub Actions workflows', () => {
     const disallowedActions = difference(allUsedActions, allowedActions)
     expect(disallowedActions).toEqual([])
   })
+
+  test('no scheduled workflows run on the hour', () => {
+    const hourlySchedules = scheduledWorkflows.filter(schedule => {
+      const hour = schedule.split(' ')[0]
+      return hour === '0' || hour === '00'
+    })
+    expect(hourlySchedules).toEqual([])
+  })
+
+  test('all scheduled workflows run at unique times', () => {
+    expect(scheduledWorkflows.length).toEqual(new Set(scheduledWorkflows).size)
+  })
 })