diff --git a/rdb_test.go b/rdb_test.go
index ba0416b..4e27f5e 100644
--- a/rdb_test.go
+++ b/rdb_test.go
@@ -18,6 +18,12 @@ func init() {
 	rand.Seed(time.Now().UnixNano())
 }
 
+var sortStrOpt = cmp.Transformer("SortStr", func(in []string) []string {
+	out := append([]string(nil), in...) // Copy input to avoid mutating it
+	sort.Strings(out)
+	return out
+})
+
 // setup connects to a redis database and flush all keys
 // before returning an instance of rdb.
 func setup(t *testing.T) *rdb {
@@ -118,31 +124,76 @@ func TestDequeue(t *testing.T) {
 
 func TestMoveAll(t *testing.T) {
 	r := setup(t)
-	seed := []*taskMessage{
-		randomTask("send_email", "default", nil),
-		randomTask("export_csv", "csv", nil),
-		randomTask("sync_stuff", "sync", nil),
-	}
-	for _, task := range seed {
-		bytes, err := json.Marshal(task)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if err := client.LPush(inProgress, string(bytes)).Err(); err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	err := r.moveAll(inProgress, defaultQueue)
+	t1 := randomTask("send_email", "default", nil)
+	t2 := randomTask("export_csv", "csv", nil)
+	t3 := randomTask("sync_stuff", "sync", nil)
+	json1, err := json.Marshal(t1)
 	if err != nil {
-		t.Errorf("moveAll(%q, %q) = %v, want nil", inProgress, defaultQueue, err)
+		t.Fatal(err)
+	}
+	json2, err := json.Marshal(t2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	json3, err := json.Marshal(t3)
+	if err != nil {
+		t.Fatal(err)
 	}
 
-	if l := client.LLen(inProgress).Val(); l != 0 {
-		t.Errorf("LLEN %q = %d, want 0", inProgress, l)
+	tests := []struct {
+		beforeSrc []string
+		beforeDst []string
+		afterSrc  []string
+		afterDst  []string
+	}{
+		{
+			beforeSrc: []string{string(json1), string(json2), string(json3)},
+			beforeDst: []string{},
+			afterSrc:  []string{},
+			afterDst:  []string{string(json1), string(json2), string(json3)},
+		},
+		{
+			beforeSrc: []string{},
+			beforeDst: []string{string(json1), string(json2), string(json3)},
+			afterSrc:  []string{},
+			afterDst:  []string{string(json1), string(json2), string(json3)},
+		},
+		{
+			beforeSrc: []string{string(json2), string(json3)},
+			beforeDst: []string{string(json1)},
+			afterSrc:  []string{},
+			afterDst:  []string{string(json1), string(json2), string(json3)},
+		},
 	}
-	if l := client.LLen(defaultQueue).Val(); int(l) != len(seed) {
-		t.Errorf("LLEN %q = %d, want %d", defaultQueue, l, len(seed))
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := client.FlushDB().Err(); err != nil {
+			t.Error(err)
+			continue
+		}
+		// seed src list.
+		for _, msg := range tc.beforeSrc {
+			client.LPush(inProgress, msg)
+		}
+		// seed dst list.
+		for _, msg := range tc.beforeDst {
+			client.LPush(defaultQueue, msg)
+		}
+
+		if err := r.moveAll(inProgress, defaultQueue); err != nil {
+			t.Errorf("(*rdb).moveAll(%q, %q) = %v, want nil", inProgress, defaultQueue, err)
+			continue
+		}
+
+		gotSrc := client.LRange(inProgress, 0, -1).Val()
+		if diff := cmp.Diff(tc.afterSrc, gotSrc, sortStrOpt); diff != "" {
+			t.Errorf("mismatch found in %q (-want, +got)\n%s", inProgress, diff)
+		}
+		gotDst := client.LRange(defaultQueue, 0, -1).Val()
+		if diff := cmp.Diff(tc.afterDst, gotDst, sortStrOpt); diff != "" {
+			t.Errorf("mismatch found in %q (-want, +got)\n%s", defaultQueue, diff)
+		}
 	}
 }
 
@@ -189,12 +240,6 @@ func TestForward(t *testing.T) {
 		},
 	}
 
-	sortStrOpt := cmp.Transformer("SortStr", func(in []string) []string {
-		out := append([]string(nil), in...) // Copy input to avoid mutating it
-		sort.Strings(out)
-		return out
-	})
-
 	for _, tc := range tests {
 		// clean up db before each test case.
 		if err := client.FlushDB().Err(); err != nil {