From eed375b138d8c07fff3827ef5da8058367bfcf81 Mon Sep 17 00:00:00 2001
From: Ken Hibino <ken.hibino7@gmail.com>
Date: Fri, 29 Nov 2019 08:00:43 -0800
Subject: [PATCH] Add test for poller

---
 poller_test.go | 110 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 poller_test.go

diff --git a/poller_test.go b/poller_test.go
new file mode 100644
index 0000000..4fe095f
--- /dev/null
+++ b/poller_test.go
@@ -0,0 +1,110 @@
+package asynq
+
+import (
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestPoller(t *testing.T) {
+	type scheduledTask struct {
+		msg       *taskMessage
+		processAt time.Time
+	}
+	r := setup(t)
+	const pollInterval = time.Second
+	p := newPoller(r, pollInterval, []string{scheduled, retry})
+	t1 := randomTask("gen_thumbnail", "default", nil)
+	t2 := randomTask("send_email", "default", nil)
+	t3 := randomTask("reindex", "default", nil)
+	t4 := randomTask("sync", "default", nil)
+
+	tests := []struct {
+		initScheduled []scheduledTask // scheduled queue initial state
+		initRetry     []scheduledTask // retry queue initial state
+		initQueue     []*taskMessage  // default queue initial state
+		wait          time.Duration   // wait duration before checking for final state
+		wantScheduled []*taskMessage  // schedule queue final state
+		wantRetry     []*taskMessage  // retry queue final state
+		wantQueue     []*taskMessage  // default queue final state
+	}{
+		{
+			initScheduled: []scheduledTask{
+				{t1, time.Now().Add(time.Hour)},
+				{t2, time.Now().Add(-2 * time.Second)},
+			},
+			initRetry: []scheduledTask{
+				{t3, time.Now().Add(-500 * time.Millisecond)},
+			},
+			initQueue:     []*taskMessage{t4},
+			wait:          pollInterval * 2,
+			wantScheduled: []*taskMessage{t1},
+			wantRetry:     []*taskMessage{},
+			wantQueue:     []*taskMessage{t2, t3, t4},
+		},
+		{
+			initScheduled: []scheduledTask{
+				{t1, time.Now()},
+				{t2, time.Now().Add(-2 * time.Second)},
+				{t3, time.Now().Add(-500 * time.Millisecond)},
+			},
+			initRetry:     []scheduledTask{},
+			initQueue:     []*taskMessage{t4},
+			wait:          pollInterval * 2,
+			wantScheduled: []*taskMessage{},
+			wantRetry:     []*taskMessage{},
+			wantQueue:     []*taskMessage{t1, t2, t3, t4},
+		},
+	}
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := r.client.FlushDB().Err(); err != nil {
+			t.Fatal(err)
+		}
+		// initialize scheduled queue
+		for _, st := range tc.initScheduled {
+			err := r.schedule(scheduled, st.processAt, st.msg)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+		// initialize retry queue
+		for _, st := range tc.initRetry {
+			err := r.schedule(retry, st.processAt, st.msg)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+		// initialize default queue
+		for _, msg := range tc.initQueue {
+			err := r.enqueue(msg)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		p.start()
+		time.Sleep(tc.wait)
+		p.terminate()
+
+		gotScheduledRaw := r.client.ZRange(scheduled, 0, -1).Val()
+		gotScheduled := mustUnmarshalSlice(t, gotScheduledRaw)
+		if diff := cmp.Diff(tc.wantScheduled, gotScheduled, sortMsgOpt); diff != "" {
+			t.Errorf("mismatch found in %q after running poller: (-want, +got)\n%s", scheduled, diff)
+		}
+
+		gotRetryRaw := r.client.ZRange(retry, 0, -1).Val()
+		gotRetry := mustUnmarshalSlice(t, gotRetryRaw)
+		if diff := cmp.Diff(tc.wantRetry, gotRetry, sortMsgOpt); diff != "" {
+			t.Errorf("mismatch found in %q after running poller: (-want, +got)\n%s", retry, diff)
+		}
+
+		gotQueueRaw := r.client.LRange(defaultQueue, 0, -1).Val()
+		gotQueue := mustUnmarshalSlice(t, gotQueueRaw)
+		if diff := cmp.Diff(tc.wantQueue, gotQueue, sortMsgOpt); diff != "" {
+			t.Errorf("mismatch found in %q after running poller: (-want, +got)\n%s", defaultQueue, diff)
+		}
+	}
+}