add testcase

core/src/test/java/com/alibaba/fastjson2/features/IgnoreNullPropertyValueTest.java

@@ -0,0 +1,31 @@
+package com.alibaba.fastjson2.features;
+
+import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.JSONFactory;
+import com.alibaba.fastjson2.JSONReader;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+
+import static com.alibaba.fastjson2.JSONReader.Feature.IgnoreNullPropertyValue;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class IgnoreNullPropertyValueTest {
+    @Test
+    public void test() {
+        String str = "{\"val\":null}";
+        assertTrue(JSON.parseObject(str, IgnoreNullPropertyValue).isEmpty());
+
+        {
+            HashMap<Object, Object> map = new HashMap<>();
+            JSONReader.of(str).read(map, IgnoreNullPropertyValue.mask);
+            assertTrue(map.isEmpty());
+        }
+
+        {
+            HashMap<Object, Object> map = new HashMap<>();
+            JSONReader.of(str, JSONFactory.createReadContext(IgnoreNullPropertyValue)).read(map, 0);
+            assertTrue(map.isEmpty());
+        }
+    }
+}