How to check if collection contains items in given order using Hamcrest
To check tha collection contains items in expected (given) order you can use Hamcrest's containsInRelativeOrder
method.
From javadoc:
Creates a matcher for Iterable's that matches when a single pass over the examined Iterable yields a series of items, that contains items logically equal to the corresponding item in the specified items, in the same relative order For example: assertThat(Arrays.asList("a", "b", "c", "d", "e"), containsInRelativeOrder("b", "d")).
Actual for Java Hamcrest 2.0.0.0.
Hope this helps.
You can use contains
matcher instead, but you probably need to use latest version of Hamcrest. That method checks the order.
assertThat(list, contains("foo", "boo"));
You can also try using containsInAnyOrder
if order does not matter to you.
That's the code for contains
matcher:
public static <E> Matcher<Iterable<? extends E>> contains(List<Matcher<? super E>> itemMatchers)
{
return IsIterableContainingInOrder.contains(itemMatchers);
}
You need to implement a custom Matcher, something like this
class ListMatcher extends BaseMatcher {
String[] items;
ListMatcher(String... items) {
this.items = items;
}
@Override
public boolean matches(Object item) {
List list = (List) (item);
int l = -1;
for (String s : items) {
int i = list.indexOf(s);
if (i == -1 || i < l) {
return false;
}
l = i;
}
return true;
}
@Override
public void describeTo(Description description) {
// not implemented
}
}
@Test
public void test1() {
List<String> list = Arrays.asList("foo", "bar", "boo");
Assert.assertThat(list, new ListMatcher("foo", "boo"));
Assert.assertThat(list, new ListMatcher("boo", "foo"));
}