gson: add test for String2ObjectMap serialization

commons-gson/src/test/java/io/gitlab/jfronny/commons/test/GsonTest.java

@@ -1,13 +1,16 @@
 package io.gitlab.jfronny.commons.test;
 
 import io.gitlab.jfronny.commons.ComparableVersion;
+import io.gitlab.jfronny.commons.data.String2ObjectMap;
 import io.gitlab.jfronny.commons.serialize.Serializer;
 import io.gitlab.jfronny.commons.serialize.gson.api.v1.Ignore;
 import io.gitlab.jfronny.commons.serialize.gson.api.v1.GsonHolders;
+import io.gitlab.jfronny.gson.reflect.TypeToken;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
+import java.util.Objects;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -30,6 +33,39 @@ public class GsonTest {
         assertDoesNotThrow(() -> assertEquals(new ComparableVersion("1.0.0"), Serializer.getInstance().deserialize("\"1.0.0\"", ComparableVersion.class)));
     }
 
+    @Test
+    void gsonString2ObjectMap() throws IOException {
+        String2ObjectMap<SimpleRecord> map = new String2ObjectMap<>();
+        map.put("Some String", new SimpleRecord("Aaee", 12));
+        map.put("Some", new SimpleRecord("Aeio", 4));
+        map.put("Some Test", new SimpleRecord("U", 64));
+        final String serialized = "{\"Some\":{\"someValue\":\"Aeio\",\"yes\":4},\"Some String\":{\"someValue\":\"Aaee\",\"yes\":12},\"Some Test\":{\"someValue\":\"U\",\"yes\":64}}";
+        assertEquals(serialized, Serializer.getInstance().serialize(map));
+        assertEquals(map, Serializer.getInstance().deserialize(serialized, new TypeToken<String2ObjectMap<SimpleRecord>>() {}.getType()));
+    }
+
+    public static final class SimpleRecord {
+        public final String someValue;
+        public final int yes;
+
+        public SimpleRecord(String someValue, int yes) {
+            this.someValue = someValue;
+            this.yes = yes;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (!(o instanceof SimpleRecord that)) return false;
+            return yes == that.yes && Objects.equals(someValue, that.someValue);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(someValue, yes);
+        }
+    }
+
     public static class ExampleType {
         String id = "Yes";
         @Ignore