Add MergePatch benchmark

Author: evanphx

v5/bench_test.go

@@ -0,0 +1,18 @@
+package jsonpatch
+
+import "testing"
+
+func BenchmarkMergePatch(b *testing.B) {
+	original := []byte(`{"name": "John", "age": 24, "height": 3.21}`)
+	target := []byte(`{"name": "Jane", "age": 24}`)
+	alternative := []byte(`{"name": "Tina", "age": 28, "height": 3.75}`)
+
+	patch, err := CreateMergePatch(original, target)
+	if err != nil {
+		panic(err)
+	}
+
+	for n := 0; n < b.N; n++ {
+		MergePatch(alternative, patch)
+	}
+}