cucumber table with valid and invalid input - cucumber

Question

I have that kind of test which works:
Feature: TestAddition
Scenario Outline: "Addition"
Given A is <A> and B is <B>
Then A + B is <result>
Examples:
| A | B | result |
| 3 | 4 | 7 |
| 2 | 5 | 7 |
| 1 | 4 | 5 |
And thats the glue code:
package featuresAdditions;
import org.junit.Assert;
import cucumber.api.java.en.Given;
import cucumber.api.java.en.Then;
import math.AdditionEngine;
public class step {
private AdditionEngine testAdditionEngine;
private double resultAddition;
#Given("^A is (\\d+) and B is (\\d+)$")
public void addition(int arg1, int arg2) throws Throwable {
testAdditionEngine = new AdditionEngine();
resultAddition = testAdditionEngine.calculateAdditionAmount(arg1, arg2);
}
#Then("^A + B is (.)$")
public void addition(double arg1) throws Throwable {
Assert.assertEquals(arg1, resultAddition, 0.01);
}
}
However I would like to know how to create an invalid table example [where ?? means I do not know what to put in the below table]
Examples:
| A | B | result |
| "é3-3" | 5 | ?? |
| "é3-3" | "aB" | ?? |
This should give a java.lang.NumberFormatException
In pure jUnit I would do something like the code below which works like a charm [with #Test(expected = NumberFormatException.class)]. However, I have to use Cucumber... Someone can tell me how to perform such a test with Cucubmer?
public class test {
AdditionEngine testAdditionEngine = new AdditionEngine();
#Test(expected = NumberFormatException.class)
public void test() {
testAdditionEngine.calculateAdditionAmount("é3-3", 5);
}
}

Answer 1

Scenario Outline: "Invalid Addition"
Given A is <A> and B is <B>
Then A + B is <result>
Examples:
| A | B | result |
| "é3-3" | 5 | java.lang.NumberFormatException |
| "é3-3" | "aB" | java.lang.NumberFormatException |
Change the stepdefinition to take a String as an argument instead of Integer.
private Exception excep;
#Given("^A is (.*?) and B is (.*?)$")
public void addValid(String arg1, String arg2) {
try {
testAdditionEngine = new AdditionEngine();
testAdditionEngine.calculateAdditionAmount(arg1, arg2);
} catch (NumberFormatException e) {
excep = e;
}
};
#Then("^A \\+ B is (.*?)$")
public void validResult(String arg1){
assertEquals(arg1, excep.getClass().getName());
};
You will get an ambiguous step message if you are on Cucumber 2 and above. This will be because the valid scenariooutline will match the integer and string stepdefinitions. Change either one of the scenario statements.