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Test Smell: the wrong parameter order in ''assertEquals'' assertions #607

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TestSmell opened this issue Aug 15, 2022 · 1 comment
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@TestSmell
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Hi!

Description:
we detect that some assertions in your test code have the wrong parameter orders.
For example, the test case named ''testPathParams()'' in ''DefaultUriMatcherTest.java'' writes the ''assertEquals'' assertion as
image

Negative:
Using ''assertEquals()'' with the wrong parameter order is a bad test practice.
Because once the test case fails, the ''assertEquals()'' assertion with the wrong parameter order will give the wrong log information.
The log information will say:’’ java.lang.AssertionError: expected [actual value] but found [ excepted value]’’, where it should have said "java.lang.AssertionError: expected [excepted value] but found [actual value]''.
This is confusing, to say the least, and you shouldn't have to deal with a possible misdirection of that message.

Solution:
Generally, the excepted value should be a known value, such as a real number, a string, etc.
The actual value should be the result of the method-under-test.
The best way to eliminate the test smell is to exchange the parameter in ''assertEquals'' assertions.

We list other test cases with the same problem as follows:

  1. testPathParams() in DefaultUriMatcherTest.java
  2. parameterTest() in RequestTest.java
  3. createEntityTest() in RequestTest.java
  4. test() in EncryptedSessionDataTranscoderTest.java
@decebals
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Can you provide a PR?

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