- B verifyAsJson() handles null LocalTimeDates.

Fixes #531

approvaltests-tests/src/test/java/org/approvaltests/JsonApprovalsTest.java

@@ -0,0 +1,26 @@
+package org.approvaltests;
+
+import com.spun.util.Wrapper;
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDateTime;
+
+public class JsonApprovalsTest {
+    @Test
+    void nullDateTest() {
+        LocalDateWrapper localDateWrapper = new LocalDateWrapper();
+        JsonApprovals.verifyAsJson(localDateWrapper, g -> g.serializeNulls());
+    }
+
+    private class LocalDateWrapper {
+        public LocalDateTime getLocalDate() {
+            return localDate;
+        }
+
+        public void setLocalDate(LocalDateTime localDate) {
+            this.localDate = localDate;
+        }
+
+        private LocalDateTime localDate;
+    }
+}

approvaltests-tests/src/test/java/org/approvaltests/JsonApprovalsTest.nullDateTest.approved.json

@@ -0,0 +1,3 @@
+{
+  "localDate": null
+}

approvaltests-util/src/main/java/com/spun/util/JsonUtils.java

@@ -112,7 +112,11 @@ public static class LocalDateTimeAdapter extends TypeAdapter<LocalDateTime>
     @Override
     public void write(JsonWriter jsonWriter, LocalDateTime instant) throws IOException
     {
-      jsonWriter.value(instant.toString());
+      if (instant == null) {
+        jsonWriter.nullValue();
+      } else {
+        jsonWriter.value("" + instant);
+      }
     }
     @Override
     public LocalDateTime read(JsonReader jsonReader) throws IOException