New test case for shoot(): Check if field was already shot

src/main/java/de/tims/fleetstorm/matchfield/Coordinate.java

@@ -44,13 +44,15 @@ public class Coordinate {
 		System.out.println("X = " + this.x + ", Y = " + this.y + ", State = " + this.state);
 	}
 
-	public void shoot() {
+	public boolean shoot() {
 		if (this.state == Coordinate.SHIP) {
 			this.state = Coordinate.HIT;
-			return;
+			return true;
 		}
 
 		this.state = Coordinate.SHOT;
+
+		return true;
 	}
 
 }

src/test/java/de/tims/fleetstorm/matchfield/CoordinateTest.java

@@ -1,6 +1,7 @@
 package de.tims.fleetstorm.matchfield;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertTrue;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.util.stream.Stream;
@@ -64,4 +65,15 @@ class CoordinateTest {
 				Arguments.of("Field State is SHOT", new Coordinate(0, 1), Coordinate.SHOT));
 	}
 
+	@Test
+	void testIfShootCheckWhenFieldIsAlreadyShot() {
+		Matchfield matchfield = new Matchfield(10);
+		matchfield.createMatchfield();
+
+		// set dummy ship
+		matchfield.setShip(new Coordinate(3, 3), 4, 1);
+
+		assertTrue(matchfield.getField(0, 0).shoot());
+	}
+
 }