test: add test case

src/libraries/System.Text.Json/tests/Common/PropertyVisibilityTests.cs

@@ -2035,6 +2035,31 @@ public async Task JsonIgnoreCondition_LastOneWins()
             Assert.Null(obj.MyString);
         }
 
+        [Fact]
+        public void JsonIgnoreCondition_WhenWriting()
+        {
+            var json = JsonSerializer.Serialize(new JsonIgnoreCondition_WhenReadingWritingTestModel{ Age = 10, Name="Mike" });
+            Assert.Equal("""{"Age":10}""", json);
+        }
+
+        [Fact]
+        public void JsonIgnoreCondition_WhenReading()
+        {
+            var json = """{"Age":10, "Name":"Mike"}""";
+            var model = JsonSerializer.Deserialize<JsonIgnoreCondition_WhenReadingWritingTestModel>(json);
+            Assert.Equal("Mike", model.Name);
+            Assert.Equal(0, model.Age);
+        }
+
+        public class JsonIgnoreCondition_WhenReadingWritingTestModel
+        {  
+            [JsonIgnore(Condition = JsonIgnoreCondition.WhenReading)]
+            public int Age { get; set; }
+            [JsonIgnore(Condition = JsonIgnoreCondition.WhenWriting)]
+            public string Name { get; set; }
+        }
+
+
         [Fact]
         public async Task ClassWithComplexObjectsUsingIgnoreWhenWritingDefaultAttribute()
         {