1 files changed, 89 insertions, 0 deletions
diff --git a/src/mongo/gotools/common/json/undefined_test.go b/src/mongo/gotools/common/json/undefined_test.go
new file mode 100644
index 00000000000..367220ff8cd
--- /dev/null
+++ b/src/mongo/gotools/common/json/undefined_test.go
@@ -0,0 +1,89 @@
+package json
+
+import (
+	"fmt"
+	. "github.com/smartystreets/goconvey/convey"
+	"testing"
+)
+
+func TestUndefinedValue(t *testing.T) {
+
+	Convey("When unmarshalling JSON with undefined values", t, func() {
+
+		Convey("works for a single key", func() {
+			var jsonMap map[string]interface{}
+
+			key := "key"
+			value := "undefined"
+			data := fmt.Sprintf(`{"%v":%v}`, key, value)
+
+			err := Unmarshal([]byte(data), &jsonMap)
+			So(err, ShouldBeNil)
+
+			jsonValue, ok := jsonMap[key].(Undefined)
+			So(ok, ShouldBeTrue)
+			So(jsonValue, ShouldResemble, Undefined{})
+		})
+
+		Convey("works for multiple keys", func() {
+			var jsonMap map[string]interface{}
+
+			key1, key2, key3 := "key1", "key2", "key3"
+			value := "undefined"
+			data := fmt.Sprintf(`{"%v":%v,"%v":%v,"%v":%v}`,
+				key1, value, key2, value, key3, value)
+
+			err := Unmarshal([]byte(data), &jsonMap)
+			So(err, ShouldBeNil)
+
+			jsonValue1, ok := jsonMap[key1].(Undefined)
+			So(ok, ShouldBeTrue)
+			So(jsonValue1, ShouldResemble, Undefined{})
+
+			jsonValue2, ok := jsonMap[key2].(Undefined)
+			So(ok, ShouldBeTrue)
+			So(jsonValue2, ShouldResemble, Undefined{})
+
+			jsonValue3, ok := jsonMap[key3].(Undefined)
+			So(ok, ShouldBeTrue)
+			So(jsonValue3, ShouldResemble, Undefined{})
+		})
+
+		Convey("works in an array", func() {
+			var jsonMap map[string]interface{}
+
+			key := "key"
+			value := "undefined"
+			data := fmt.Sprintf(`{"%v":[%v,%v,%v]}`,
+				key, value, value, value)
+
+			err := Unmarshal([]byte(data), &jsonMap)
+			So(err, ShouldBeNil)
+
+			jsonArray, ok := jsonMap[key].([]interface{})
+			So(ok, ShouldBeTrue)
+
+			for _, _jsonValue := range jsonArray {
+				jsonValue, ok := _jsonValue.(Undefined)
+				So(ok, ShouldBeTrue)
+				So(jsonValue, ShouldResemble, Undefined{})
+			}
+		})
+
+		Convey("cannot have a sign ('+' or '-')", func() {
+			var jsonMap map[string]interface{}
+
+			key := "key"
+			value := "undefined"
+			data := fmt.Sprintf(`{"%v":+%v}`, key, value)
+
+			err := Unmarshal([]byte(data), &jsonMap)
+			So(err, ShouldNotBeNil)
+
+			data = fmt.Sprintf(`{"%v":-%v}`, key, value)
+
+			err = Unmarshal([]byte(data), &jsonMap)
+			So(err, ShouldNotBeNil)
+		})
+	})
+}