add tests for json strict unmarshall

utils/jsonStrictUnmarshall_test.go

@@ -0,0 +1,65 @@
+package utils
+
+import (
+	"testing"
+)
+
+type Address struct {
+	Street string `json:"street"`
+	City   string `json:"city"`
+}
+
+type Person struct {
+	Name    string  `json:"name"`
+	Age     int     `json:"age"`
+	Address Address `json:"address"`
+}
+
+func TestStrictUnmarshal(t *testing.T) {
+	validJSON := []byte(`{
+		"name": "John Doe",
+		"age": 30,
+		"address": {
+			"street": "123 Main St",
+			"city": "Anytown"
+		}
+	}`)
+
+	invalidJSON := []byte(`{
+		"name": "John Doe",
+		"age": 30,
+		"address": {
+			"street": "123 Main St",
+			"city": "Anytown"
+		},
+		"unknownField": "value"
+	}`)
+
+	// this json has an unknown field in the inner struct
+	invalidJSON_2 := []byte(`{
+		"name": "John Doe",
+		"age": 30,
+		"address": {
+			"street": "123 Main St",
+			"city": "Anytown",
+			"unknownInnerField": "value"
+		}
+	}`)
+
+	var person Person
+
+	err := StrictUnmarshal(validJSON, &person)
+	if err != nil {
+		t.Errorf("expected no error, got %v", err)
+	}
+
+	err = StrictUnmarshal(invalidJSON, &person)
+	if err == nil {
+		t.Errorf("expected error, got none")
+	}
+
+	err = StrictUnmarshal(invalidJSON_2, &person)
+	if err == nil {
+		t.Errorf("expected error, got none")
+	}
+}