hamcrest

I would like to compare two arrays of doubles. Using vanilla JUnit, I can do: double[] a = new double[]{1.0, 2.0, 3.0}; double[] b = new double[]{1.0, 2.0, 3.0}; assertEquals(a, b, 1e-10); I would like to know how to do this using Hamcrest, preferably without creating custom Matchers (if possible). Something akin to using the "close" matcher for each element in an array. If you change a to a Double[] then you can do assertThat(a, arrayCloseTo(b, .2)); with this helper method: public static Matcher<Double[]> arrayCloseTo(double[] array, double error) { List<Matcher<? super Double>> matchers =

I'm currently trying to build a more or less complete set of unit tests for a small library. Since we want to allow different implementations to exist we want this set of tests to be (a) generic, so that we can re-use it to test the different implementations and (b) as complete as possible. For the (b) part I'd like to know if there is any best-practice out there for testing enum types. So for example I have an enum as follows: public enum Month { January, February, ... December; } Here I want to ensure that all enum types really exist. Is that even necessary? Currently I'm using Hamcrests

I can't understand how JUnit 4.8 should work with Hamcrest matchers. There are some matchers defined inside junit-4.8.jar in org.hamcrest.CoreMatchers . At the same time there are some other matchers in hamcrest-all-1.1.jar in org.hamcrest.Matchers . So, where to go? Shall I explicitly include hamcrest JAR into the project and ignore matchers provided by JUnit? In particular, I'm interested in empty() matcher and can't find it in any of these jars. I need something else? :) And a philosophical question: why JUnit included org.hamcrest package into its own distribution instead of encouraging us

I could with following code check if a list has a item, which greater than 30. //Using Hamcrest List<Integer> ints= Arrays.asList(22,33,44,55); assertThat(ints,hasItem(greaterThan(30))); But how could I assert if a list has at least 2 items, which are greater than 30? With AssertJ , there is a solution I know. But I have no idea how to realize that with Hamcrest . //Using AssertJ List<Integer> ints= Arrays.asList(22,33,44,55); Condition<Integer> greaterThanCondition = new Condition<Integer>("greater") { @Override public boolean matches (Integer i){ return i>30; } } ; assertThat(ints)

That's going to be an easy one, but I cannot find the difference between them and which one to use, if I have both the lib's included in my classpath? Hamcrest matcher methods return Matcher<T> and Mockito matchers return T. So, for example: org.hamcrest.Matchers.any(Integer.class) returns an instance of org.hamcrest.Matcher<Integer> , and org.mockito.Matchers.any(Integer.class) returns an instance of Integer . That means that you can only use Hamcrest matchers when a Matcher<?> object is expected in the signature - typically, in assertThat calls. When setting up expectations or verifications

Why does this not compile, oh, what to do? import static org.junit.Assert.assertThat; import static org.junit.matchers.JUnitMatchers.hasItems; ArrayList<Integer> actual = new ArrayList<Integer>(); ArrayList<Integer> expected = new ArrayList<Integer>(); actual.add(1); expected.add(2); assertThat(actual, hasItems(expected)); error copied from comment: cannot find symbol method assertThat(java.util.ArrayList<java.lang.Integer>, org.hamcreset.Matcher<java.lang.Iterable<java.util.ArrayList<java.lang.Integer>>>) Clive Evans Just ran into this post trying to fix it for myself. Gave me just enough

I am using hamcrest 1.3 to test my code. It is simply a die. I am trying to test it to make sure the number generated is less than 13. I had a print statement that printed what the number generated was. The number generated was always less than 13 but the test always failed. Is there something I am doing wrong? This is the code I am testing. import java.util.Random; public class Die { private int numSides; Random rand; public Die(int numSides){ this.numSides = numSides; rand = new Random(System.currentTimeMillis()); } public int roll(){ return rand.nextInt(numSides) + 1; } } And this is my