Extend test_double_serializer to check NaN and Infinity handling.

tests/test_double_serializer.c

@@ -8,6 +8,9 @@
 #include "json_object.h"
 #include "json_object_private.h"
 
+/* Avoid compiler warnings about diving by constant zero */
+double zero_dot_zero = 0.0;
+
 int main()
 {
 	struct json_object *obj = json_object_new_double(0.5);
@@ -80,4 +83,15 @@ int main()
 	printf("obj(-12.0).to_string(default format)=%s\n", json_object_to_json_string(obj));
 	json_object_put(obj);
 
+	/* Test NaN handling */
+	obj = json_object_new_double(zero_dot_zero / zero_dot_zero);
+	printf("obj(0.0/0.0)=%s\n", json_object_to_json_string(obj));
+
+	/* Test Infinity and -Infinity handling */
+	obj = json_object_new_double(1.0/zero_dot_zero);
+	printf("obj(1.0/0.0)=%s\n", json_object_to_json_string(obj));
+
+	obj = json_object_new_double(-1.0/zero_dot_zero);
+	printf("obj(-1.0/0.0)=%s\n", json_object_to_json_string(obj));
+
 }

tests/test_double_serializer.expected

@@ -17,3 +17,6 @@ obj(12.0).to_string(%.0f)=12
 obj(12.0).to_string(%.0g)=1e+01
 obj(12.0).to_string(%.1g)=12.0
 obj(-12.0).to_string(default format)=-12.0
+obj(0.0/0.0)=NaN
+obj(1.0/0.0)=Infinity
+obj(-1.0/0.0)=-Infinity