From 5c527ab46388f481cb5af1ee4c5b5d807c6da39d Mon Sep 17 00:00:00 2001
From: Masaaki Goshima <goccy54@gmail.com>
Date: Mon, 30 Aug 2021 13:02:43 +0900
Subject: [PATCH] Add test case

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

diff --git a/encode_test.go b/encode_test.go
index 83075c5..358e51f 100644
--- a/encode_test.go
+++ b/encode_test.go
@@ -2108,3 +2108,29 @@ func TestEmbeddedNotFirstField(t *testing.T) {
 		t.Fatalf("failed to encode embedded structure. expected = %q but got %q", expected, got)
 	}
 }
+
+type implementedMethodIface interface {
+	M()
+}
+
+type implementedIfaceType struct {
+	A int
+	B string
+}
+
+func (implementedIfaceType) M() {}
+
+func TestImplementedMethodInterfaceType(t *testing.T) {
+	data := []implementedIfaceType{implementedIfaceType{}}
+	expected, err := stdjson.Marshal(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got, err := json.Marshal(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(expected, got) {
+		t.Fatalf("failed to encode implemented method interface type. expected:[%q] but got:[%q]", expected, got)
+	}
+}