@Test
public void the_return_string_should_be_random() {
int generatedTimes = 5;
Set<String> numbersSet = new HashSet<>();
for (int i = 0; i < generatedTimes; i++) {
numbersSet.add(numberGenerator.generate());
}
assertThat(numbersSet.size(), is(generatedTimes));
}
@Test
public void the_return_string_should_be_number() throws NumberFormatException {
String generated = numberGenerator.generate();
try {
Integer.parseInt(generated);
} catch (NumberFormatException e) {
fail("Not a number");
}
}
@Test
public void the_return_string_should_have_different_diggits() {
String generated = numberGenerator.generate();
Set<Character> numberSet = new HashSet<>();
for (int i = 0; i < generated.length(); i++) {
numberSet.add(generated.charAt(i));
}
assertThat(numberSet.size(), is(4));
}
@Test
public void the_return_string_length_should_be_4() {
String generated = numberGenerator.generate();
assertThat(generated.length(), is(4));
}
