From 6995fa9b0ca696c292b1ee5d4daaff6472ec7ffe Mon Sep 17 00:00:00 2001
From: Dong-hee Na <donghee.na92@gmail.com>
Date: Thu, 10 May 2018 11:47:10 +0900
Subject: [PATCH] goimagehash: Add test

---
 hashcompute_test.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/hashcompute_test.go b/hashcompute_test.go
index 9b88c59..5d8e0ef 100644
--- a/hashcompute_test.go
+++ b/hashcompute_test.go
@@ -98,6 +98,32 @@ func TestHashCompute(t *testing.T) {
 	}
 }
 
+func NilHashComputeTest(t *testing.T) {
+	hash, err := AverageHash(nil)
+	if err == nil {
+		t.Errorf("Error should be got.")
+	}
+	if hash != nil {
+		t.Errorf("Nil hash should be got. but got %v", hash)
+	}
+
+	hash, err = DifferenceHash(nil)
+	if err == nil {
+		t.Errorf("Error should be got.")
+	}
+	if hash != nil {
+		t.Errorf("Nil hash should be got. but got %v", hash)
+	}
+
+	hash, err = PerceptionHash(nil)
+	if err == nil {
+		t.Errorf("Error should be got.")
+	}
+	if hash != nil {
+		t.Errorf("Nil hash should be got. but got %v", hash)
+	}
+}
+
 func BenchmarkDistanceIdentical(b *testing.B) {
 	h1 := &ImageHash{hash: 0xe48ae53c05e502f7}
 	h2 := &ImageHash{hash: 0xe48ae53c05e502f7}