diff --git a/wordfrequency/wordfrequency_test.go b/wordfrequency/wordfrequency_test.go
new file mode 100644
index 0000000..6a948bc
--- /dev/null
+++ b/wordfrequency/wordfrequency_test.go
@@ -0,0 +1,31 @@
+package wordfrequency
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestGetWordFrequency(t *testing.T) {
+	input := bytes.NewBufferString(
+		"hello WORLD Hello world World hello cats HELLO cats dogs")
+
+	/* NOTE: DeepEqual nuance: Can't compare [4]Word with
+	 * []Word, because Array != Slice.
+	 * See https://play.golang.org/p/aDPIwjDq5bJ
+	 * Also, order of expect slice is important. Keep as is.
+	 */
+	expect := []Word{Word{"hello", 4}, Word{"world", 3},
+		Word{"cats", 2}, Word{"dogs", 1}}
+
+	actual, err := GetWordFrequency(input, SORT_DESC, 3)
+
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	if !reflect.DeepEqual(expect, actual.Words) {
+		t.Errorf("Expected %v; got %v\n", expect, actual.Words)
+	}
+}