c# - Assert.AreEqual fails on a class derived from List<> that overrides Equals() -


i've been having troubles nunit. have class inherits list , overrides equals() (so 2 instances can considered equal when contain same elements in different order). when using assert.areequal, fails, using assert.true , calling equals manually works :

[test] public void equals() {     var dieset1 = new dieset {new die(1), new die(2)};     var dieset2 = new dieset {new die(2), new die(1)};      assert.true(dieset1.equals(dieset2)); //ok     assert.areequal(dieset1, dieset2);    //fails exception }

here exception detail :

nunit.framework.assertionexception unhandled user code hresult=-2146233088 message= expected , actual both 2 elements values differ @ index [0] expected: was:

source=nunit.framework stacktrace: @ nunit.framework.assert.that(object actual, iresolveconstraint expression, string message, object[] args) @ nunit.framework.assert.areequal(object expected, object actual) @ dicelibtest.diesettest.equals() in c:\dev_code\dicelib\dicelibtest\diesettest.cs:line 47 innerexception:

i set breakpoint in equals(), , made sure wasn't called when assert.areequal called.

my class :

public class dieset : list<die>, irollable { }

i've read related questions, instance : nunit doesn't work assert.areequal

but double checked , equals() method has correct signature.

public override bool equals(object obj) { }

my guess nunit internally has special behaviors on list<> and/or arrays and/or collections in general, , class falls in 1 of these categories. other guess i'm doing wrong , i'm failing see obvious..

yup - it's documented:

beginning version 2.4, multi-dimensioned arrays, nested arrays (arrays of arrays) , collections may compared. 2 arrays or collections treated equal assert.areequal if have same dimensions , if each of corresponding elements equal.

so want assert.true version instead, basically.

for most users, behaviour desirable - happens conflict particular use.

personally wouldn't make set-semantics type derive list<t> start though - if implemented iset<t> instead (and used composition) may work.


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