From 31e0226908ff016d8ba91a190809827975248941 Mon Sep 17 00:00:00 2001
From: Aleksandr Petrukhin <shmeleine@gmail.com>
Date: Tue, 29 May 2018 16:32:28 +0000
Subject: [PATCH] [Tests] add tests for disallow_unknown_fields

---
 .gitignore                | 1 +
 Makefile                  | 1 +
 README.md                 | 2 ++
 tests/basic_test.go       | 8 ++++++++
 tests/disallow_unknown.go | 8 ++++++++
 5 files changed, 20 insertions(+)
 create mode 100644 tests/disallow_unknown.go

diff --git a/.gitignore b/.gitignore
index db8c66e..26156fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 *_easyjson.go
 *.iml
 .idea
+*.swp
diff --git a/Makefile b/Makefile
index 49c80f3..7717c1e 100644
--- a/Makefile
+++ b/Makefile
@@ -37,6 +37,7 @@ generate: root build
 	.root/bin/easyjson .root/src/$(PKG)/tests/named_type.go
 	.root/bin/easyjson .root/src/$(PKG)/tests/custom_map_key_type.go
 	.root/bin/easyjson .root/src/$(PKG)/tests/embedded_type.go
+	.root/bin/easyjson -disallow_unknown_fields .root/src/$(PKG)/tests/disallow_unknown.go
 
 test: generate root
 	go test \
diff --git a/README.md b/README.md
index 9366e3f..b59d3ad 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,8 @@ Usage of easyjson:
         use lowerCamelCase instead of CamelCase by default
   -stubs
     	only generate stubs for marshaler/unmarshaler funcs
+  -disallow_unknown_fields
+        return error if some unknown field in json occured
 ```
 
 Using `-all` will generate marshalers/unmarshalers for all Go structs in the
diff --git a/tests/basic_test.go b/tests/basic_test.go
index 28f0fdf..ab166f3 100644
--- a/tests/basic_test.go
+++ b/tests/basic_test.go
@@ -232,3 +232,11 @@ func TestUnmarshalStructWithEmbeddedPtrStruct(t *testing.T) {
 		t.Errorf("easyjson.Unmarshal() = %#v; want %#v", s, structWithInterfaceValueFilled)
 	}
 }
+
+func TestDisallowUnknown(t *testing.T) {
+	var d DisallowUnknown
+	err := easyjson.Unmarshal([]byte(disallowUnknownString), &d)
+	if err == nil {
+		t.Error("want error, got nil")
+	}
+}
diff --git a/tests/disallow_unknown.go b/tests/disallow_unknown.go
new file mode 100644
index 0000000..5b884c6
--- /dev/null
+++ b/tests/disallow_unknown.go
@@ -0,0 +1,8 @@
+package tests
+
+//easyjson:json
+type DisallowUnknown struct {
+	FieldOne string `json:"field_one"`
+}
+
+var disallowUnknownString = `{"field_one": "one", "field_two": "two"}`