unittest: ShopCommandTest.java

src/main/java/org/bitbiome/commands/ShopCommand.java

@@ -35,7 +35,7 @@ public class ShopCommand implements CommandAPI{
         }
     }
 
-    private boolean validInput(String input){
+    public static boolean validInput(String input){
         return (input.equals("1") || input.equals("2") || input.equals("3"));
     }
 

src/test/java/org/bitbiome/commands/ShopCommandTest.java

@@ -0,0 +1,16 @@
+package org.bitbiome.commands;
+
+import org.bitbiome.shop.Shop;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ShopCommandTest {
+    final ShopCommand shopCommand = new ShopCommand();
+    @Test
+    public void testValidInput(){
+        boolean expected = true;
+        boolean result = shopCommand.validInput("1");
+        assertEquals(expected, result);
+    }
+}