Added test cases for backend module for serialisation

shielddb-gson-backend/pom.xml

@@ -20,5 +20,15 @@
 			<artifactId>gson</artifactId>
 			<version>2.8.5</version>
 		</dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.hamcrest</groupId>
+			<artifactId>hamcrest</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 </project>

shielddb-gson-backend/src/test/java/nf.fr.k49.sheilddb.gson/ShieldDBGsonTest.java

@@ -0,0 +1,102 @@
+package nf.fr.k49.sheilddb.gson;
+
+
+import com.google.gson.*;
+import nf.fr.k49.shielddb.gson.ShieldDBGson;
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Type;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+
+public class ShieldDBGsonTest {
+
+    static ShieldDBGson<User> shieldDBGson;
+
+    @Test
+    public void testDefaultStorageInstantiation(){
+        assertDoesNotThrow(()->new ShieldDBGson<User>()
+                ,"must be able to be instantiated with default constructor");
+    }
+
+    @Test
+    public void testStorageInstantiationWithGson(){
+        Gson gson = new GsonBuilder()
+                .registerTypeAdapter(User.class,new UserDeserializer())
+                .create();
+        shieldDBGson = new ShieldDBGson<User>(gson);
+        assertDoesNotThrow(()->shieldDBGson
+                ,"must be able to be instantiated with default constructor");
+
+        assertEquals("[{\"name\":\"shieldDB\"}]",shieldDBGson.toJson
+                (Arrays.asList(new User("shieldDB"))));
+
+    }
+
+    @Test
+    public void testStorageInstantiationWithGsonAndType(){
+        Gson gson = new GsonBuilder()
+                .registerTypeAdapter(User.class,new UserDeserializer())
+                .create();
+        ShieldDBGson shieldDBGson = new ShieldDBGson<User>(gson,User.class);
+        assertDoesNotThrow(()-> shieldDBGson
+                ,"must be able to be with gson + type constructor");
+
+        assertEquals("[{\"name\":\"shieldDB\"}]",shieldDBGson.toJson
+                (Arrays.asList(new User("shieldDB"))));
+    }
+
+
+    @Test
+    public void testToList(){
+        Gson gson = new GsonBuilder()
+                .registerTypeAdapter(User.class,new UserDeserializer())
+                .create();
+        ShieldDBGson shieldDBGson = new ShieldDBGson<User>(gson);
+
+        List<User> user = shieldDBGson.toList("[{\"name\":\"shieldDB\"}]");
+
+        assertEquals(1,user.size());
+
+    }
+
+
+
+
+}
+
+class UserDeserializer implements JsonDeserializer<User>{
+
+    @Override
+    public User deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
+        JsonObject jsonObject = jsonElement.getAsJsonObject();
+        String name = jsonObject.get("name").getAsString();
+        return new User(name);
+    }
+}
+
+class User{
+
+    String name;
+
+    User(){}
+
+    User(String name){
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        User user = (User) o;
+        return Objects.equals(name, user.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
+}