Added & tested equals() and hashCode() in IntegerArgumentType

src/main/java/net/minecraft/commands/arguments/IntegerArgumentType.java

@@ -53,4 +53,18 @@ public class IntegerArgumentType implements CommandArgumentType<Integer> {
             throw new IllegalArgumentSyntaxException();
         }
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof IntegerArgumentType)) return false;
+
+        IntegerArgumentType that = (IntegerArgumentType) o;
+        return maximum == that.maximum && minimum == that.minimum;
+    }
+
+    @Override
+    public int hashCode() {
+        return 31 * minimum + maximum;
+    }
 }

src/test/java/net/minecraft/commands/arguments/IntegerArgumentTypeTest.java

@@ -5,6 +5,7 @@ import net.minecraft.commands.context.CommandContextBuilder;
 import net.minecraft.commands.context.ParsedArgument;
 import net.minecraft.commands.exceptions.ArgumentValidationException;
 import net.minecraft.commands.exceptions.IllegalArgumentSyntaxException;
+import com.google.common.testing.EqualsTester;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -65,4 +66,14 @@ public class IntegerArgumentTypeTest {
 
         assertThat(IntegerArgumentType.getInteger(context, "foo"), is(100));
     }
+
+    @Test
+    public void testEquals() throws Exception {
+        new EqualsTester()
+            .addEqualityGroup(integer(), integer())
+            .addEqualityGroup(integer(-100, 100), integer(-100, 100))
+            .addEqualityGroup(integer(-100, 50), integer(-100, 50))
+            .addEqualityGroup(integer(-50, 100), integer(-50, 100))
+            .testEquals();
+    }
 }