src/test/java/InventoryTest.java

@@ -33,4 +33,5 @@ public class InventoryTest {
                 )
         ));
     }
+
 }

src/test/java/MinerTest.java

@@ -7,7 +7,9 @@ import org.junit.jupiter.api.Test;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
 
 public class MinerTest {
     private Player defaultPlayer() {return new Player("John"); }
@@ -41,7 +43,8 @@ public class MinerTest {
     }
     @Test
     void dig_in_coast_use_coast_loot() {
-        RandomProvider random = bound -> 9;
+        RandomProvider random = mock(RandomProvider.class);
+        when(random.nextInt(anyInt())).thenReturn(9);
         var job = new Miner(defaultPlayer());
         Biome.COAST.getLootTable().setRandomProvider(random);
         job.dig(Biome.COAST);
@@ -51,7 +54,8 @@ public class MinerTest {
 
     @Test
     void dig_in_mountain_use_mountain_loot() {
-        RandomProvider random = bound -> 15;
+        RandomProvider random = mock(RandomProvider.class);
+        when(random.nextInt(anyInt())).thenReturn(15);
         var job = new Miner(defaultPlayer());
         Biome.MOUNTAIN.getLootTable().setRandomProvider(random);
         job.dig(Biome.MOUNTAIN);