Add tests for PositionComposer class

Author: Jakubk15

src/test/java/com/eternalcode/parcellockers/configuration/composer/PositionComposerTest.java

@@ -0,0 +1,69 @@
+package com.eternalcode.parcellockers.configuration.composer;
+
+import com.eternalcode.parcellockers.shared.Position;
+import org.junit.jupiter.api.Test;
+import panda.std.AttemptFailedException;
+import panda.std.Result;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class PositionComposerTest {
+
+    private final PositionComposer positionComposer = new PositionComposer();
+
+    @Test
+    void testSerialize() {
+        // Given
+        Position position = new Position(10, 20, 30, "world");
+        String expected = "Position{x=10, y=20, z=30, world='world'}";
+
+        // When
+        Result<String, Exception> result = this.positionComposer.serialize(position);
+
+        // Then
+        assertTrue(result.isOk());
+        assertEquals(expected, result.get());
+    }
+
+    @Test
+    void testDeserialize() {
+        // Given
+        String positionString = "Position{x=-50, y=64, z=120, world='world_nether'}";
+        Position expected = new Position(-50, 64, 120, "world_nether");
+
+        // When
+        Result<Position, Exception> result = this.positionComposer.deserialize(positionString);
+
+        // Then
+        assertTrue(result.isOk());
+        assertEquals(expected, result.get());
+    }
+
+    @Test
+    void testDeserializeInvalidFormat() {
+        // Given
+        String invalidString = "world,-50,64,120";
+
+        // When
+        Result<Position, Exception> result = this.positionComposer.deserialize(invalidString);
+
+        // Then
+        assertTrue(result.isErr());
+        assertInstanceOf(IllegalArgumentException.class, result.getError());
+    }
+
+    @Test
+    void testSerializeNull() {
+        // When & Then
+        assertThrows(NullPointerException.class, () -> this.positionComposer.serialize(null));
+    }
+
+    @Test
+    void testDeserializeNull() {
+        // When & Then
+        assertThrows(AttemptFailedException.class, () -> this.positionComposer.deserialize(null));
+    }
+}