fix(assert): add formatting for assertNotEquals error messages

[IgorM867]

As mentioned in #4955, this PR changes the way messages are formatted in assertNotEquals.

Current errors

Code: assertNotEquals("1", "1");

Output: error: AssertionError: Expected actual: 1 not to be: 1.

---

Code: assertNotEquals({ foo: 1 }, { foo: 1 });

Output:
error: AssertionError: Expected actual: [object Object] not to be: [object Object].

---

Code: assertNotEquals([1, 2], [1, 2]);

Output: error: AssertionError: Expected actual: 1,2 not to be: 1,2.

---

Errors after fix

Code:

assertNotEquals("1", "1");

Output:

error: AssertionError: Expected actual: "1" not to be: "1".

---

Code:

assertNotEquals({ foo: 1 }, { foo: 1 });

Output:

error: AssertionError: Expected actual: {
  foo: 1,
} not to be: {
  foo: 1,
}.

---

Code:

assertNotEquals([1, 2], [1, 2]);

Output:

error: AssertionError: Expected actual: [
  1,
  2,
] not to be: [
  1,
  2,
].

Fixes #4955

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.51%. Comparing base (b2b7f99) to head (acb1c1f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6246      +/-   ##
==========================================
- Coverage   96.53%   96.51%   -0.02%     
==========================================
  Files         535      535              
  Lines       41028    41029       +1     
  Branches     6141     6141              
==========================================
- Hits        39605    39599       -6     
- Misses       1381     1387       +6     
- Partials       42       43       +1     

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[kt3k]

Good catch! Thanks

This mostly looks good to me, but could you also add a test case for assertNotEquals({ foo: 1 }, { foo: 1 }) to demonstrate better what we fixed?

[kt3k]

LGTM. Thanks!