CODEWITHSUNDEEP
javaunit-testingjunitclasscastexceptiontreemap
java123999
java123999

Reputation: 7394

unit test to assert that Objects in a TreeMap are in the correct order?

I am trying to write a Junit test to assert that Objects in my TreeMap are in the correct order.

How can I do so?

I am trying to do the following:

assertEquals(treeMapFromMethod.get(0), ValueThatShouldBeFirstEntryInTreeMap);

But I am getting the error:

"java.lang.ClassCastException: java.lang.Integer cannot be cast to MyObJect"

This error relates to the Line above.

How can I fix this/ is there a better way to test this?

Upvotes: 0

Views: 2177

Answers (1)

Roland Weisleder
Roland Weisleder

Reputation: 10511

If you use Hamcrest you can do this easily with the contains matcher:

TreeMap<String, Integer> map = new TreeMap<>();
map.put("one", 1);
map.put("two", 2);
map.put("three", 3);

Assert.assertThat(map.keySet(), Matchers.contains("one", "three", "two"));

The contains matcher checks, if the given collection has the same length and contains the given items in the same order.

Upvotes: 3

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