1 files changed, 71 insertions, 0 deletions
diff --git a/common/types/evictingqueue_test.go b/common/types/evictingqueue_test.go
new file mode 100644
index 000000000..a33f1a344
--- /dev/null
+++ b/common/types/evictingqueue_test.go
@@ -0,0 +1,71 @@
+// Copyright 2017-present The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package types
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestEvictingStringQueue(t *testing.T) {
+	assert := require.New(t)
+
+	queue := NewEvictingStringQueue(3)
+
+	assert.Equal("", queue.Peek())
+	queue.Add("a")
+	queue.Add("b")
+	queue.Add("a")
+	assert.Equal("b", queue.Peek())
+	queue.Add("b")
+	assert.Equal("b", queue.Peek())
+
+	queue.Add("a")
+	queue.Add("b")
+
+	assert.Equal([]string{"b", "a"}, queue.PeekAll())
+	assert.Equal("b", queue.Peek())
+	queue.Add("c")
+	queue.Add("d")
+	// Overflowed, a should now be removed.
+	assert.Equal([]string{"d", "c", "b"}, queue.PeekAll())
+	assert.Len(queue.PeekAllSet(), 3)
+	assert.True(queue.PeekAllSet()["c"])
+}
+
+func TestEvictingStringQueueConcurrent(t *testing.T) {
+	var wg sync.WaitGroup
+	val := "someval"
+
+	queue := NewEvictingStringQueue(3)
+
+	for j := 0; j < 100; j++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			queue.Add(val)
+			v := queue.Peek()
+			if v != val {
+				t.Error("wrong val")
+			}
+			vals := queue.PeekAll()
+			if len(vals) != 1 || vals[0] != val {
+				t.Error("wrong val")
+			}
+		}()
+	}
+	wg.Wait()
+}