Hamcrest compare collections

Question

I m trying to compare 2 lists   assertThat actual getList    is Matchers containsInAnyOrder expectedList       But idea   java  no suitable method found for assertThat java util List lt Agent gt  org hamcrest Matcher lt java lang Iterable lt   extends model Agents gt  gt   method org junit Assert  lt T gt assertThat T org hamcrest Matcher lt T gt   is not applicable    no instance s  of type variable s  T exist so that argument type org hamcrest Matcher lt java lang Iterable lt   extends model Agents gt  gt  conforms to formal parameter type org hamcrest Matcher lt T gt   method org junit Assert  lt T gt assertThat java lang String T org hamcrest Matcher lt T gt   is not applicable    cannot instantiate from arguments because actual and formal argument lists differ in length    How should I write it

User · Answer

List lt Long gt  actual   Arrays asList 1L  2L   List lt Long gt  expected   Arrays asList 2L  1L   assertThat actual  containsInAnyOrder expected toArray        Shorter version of  Joe s answer without redundant parameters

User · Answer

To complement  Joe s answer   Hamcrest provides you with three main methods to match a list   contains Checks for matching all the elements taking in count the order  if the list has more or less elements  it will fail  containsInAnyOrder Checks for matching all the elements and it doesn t matter the order  if the list has more or less elements  will fail  hasItems Checks just for the specified objects it doesn t matter if the list has more  hasItem Checks just for one object it doesn t matter if the list has more  All of them can receive a list of objects and use equals method for comparation or can be mixed with other matchers like  borjab mentioned   assertThat myList   contains allOf hasProperty  id   is 7L                                        hasProperty  name   is  testName1                                        hasProperty  description   is  testDesc1                                   allOf hasProperty  id   is 11L                                        hasProperty  name   is  testName2                                        hasProperty  description   is  testDesc2          http   hamcrest org JavaHamcrest javadoc 1 3 org hamcrest Matchers html contains E     http   hamcrest org JavaHamcrest javadoc 1 3 org hamcrest Matchers html containsInAnyOrder java util Collection  http   hamcrest org JavaHamcrest javadoc 1 3 org hamcrest Matchers html hasItems T

User · Answer

For list of objects you may need something like this  import static org hamcrest MatcherAssert assertThat  import static org hamcrest Matchers contains  import static org hamcrest Matchers allOf  import static org hamcrest beans HasPropertyWithValue hasProperty  import static org hamcrest Matchers is    Test  SuppressWarnings  quot unchecked quot   public void test returnsList         arrange           List lt MyBean gt  myList   act             assertThat myList   contains allOf hasProperty  quot id quot            is 7L                                            hasProperty  quot name quot          is  quot testName1 quot                                            hasProperty  quot description quot   is  quot testDesc1 quot                                       allOf hasProperty  quot id quot            is 11L                                            hasProperty  quot name quot          is  quot testName2 quot                                            hasProperty  quot description quot   is  quot testDesc2 quot           Use containsInAnyOrder if you do not want to check the order of the objects  P S  Any help to avoid the warning that is suppresed will be really appreciated

User · Answer

To compare two lists with the order preserved use    assertThat actualList  contains  item1   item2

User · Answer

With existing Hamcrest libraries  as of v 2 0 0 0  you are forced to use Collection toArray   method on your Collection in order to use containsInAnyOrder Matcher  Far nicer would be to add this as a separate method to org hamcrest Matchers   public static  lt T gt  org hamcrest Matcher lt java lang Iterable lt   extends T gt  gt  containsInAnyOrder Collection lt T gt  items        return org hamcrest collection IsIterableContainingInAnyOrder  lt T gt containsInAnyOrder  T    items toArray         Actually I ended up adding this method to my custom test library and use it to increase readability of my test cases  due to less verbosity

User · Answer

If you want to assert that the two lists are identical  don t complicate things with Hamcrest   assertEquals expectedList  actual getList       If you really intend to perform an order-insensitive comparison  you can call the containsInAnyOrder varargs method and provide values directly   assertThat actual getList    containsInAnyOrder  item1    item2        Assuming that your list is of String  rather than Agent  for this example    If you really want to call that same method with the contents of a List   assertThat actual getList    containsInAnyOrder expectedList toArray new String expectedList size         Without this  you re calling the method with a single argument and creating a Matcher that expects to match an Iterable where each element is a List  This can t be used to match a List   That is  you can t match a List lt Agent gt  with a Matcher lt Iterable lt List lt Agent gt  gt   which is what your code is attempting

User · Answer

Make sure that the Objects in your list have equals   defined on them  Then assertThat generatedList  is equalTo expectedList      works

[java] Hamcrest compare collections

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