feat(cron): add IsRunning (#40)

cron.go

@@ -297,6 +297,11 @@ func (c *Cron) Stop() context.Context {
 	return ctx
 }
 
+// IsRunning returns true if the cron scheduler is started.
+func (c *Cron) IsRunning() bool {
+	return c.running
+}
+
 // entrySnapshot returns a copy of the current cron entry list.
 func (c *Cron) entrySnapshot() []Entry {
 	entries := make([]Entry, len(c.entries))

cron_test.go

@@ -766,6 +766,18 @@ func TestStopAndWait(t *testing.T) {
 	})
 }
 
+func TestCron_IsRunning(t *testing.T) {
+	c := New()
+
+	assert.False(t, c.IsRunning())
+
+	c.Start()
+	assert.True(t, c.IsRunning())
+
+	c.Stop()
+	assert.False(t, c.IsRunning())
+}
+
 func TestMultiThreadedStartAndStop(*testing.T) {
 	cron := New()
 	go cron.Run()