Implement IntOperator.getOperand()

Co-Authored-By: td1223

src/main/java/ic/doc/IntOperator.java

@@ -12,6 +12,10 @@ public class IntOperator {
     this.operator = operator;
   }
 
+  public int getOperands() {
+    return operands;
+  }
+
   public int evaluate(List<Integer> arguments) {
     if (arguments.size() != operands) {
       throw new IllegalArgumentException(

src/test/java/ic/doc/IntOperatorTest.java

@@ -25,4 +25,10 @@ public class IntOperatorTest {
       // good
     }
   }
+
+  @Test
+  public void canGetOperatorOperandsCount() {
+    IntOperator intOperator = new IntOperator(2, arguments -> arguments.get(0) + arguments.get(1));
+    assertThat(intOperator.getOperands(), is(2));
+  }
 }