Enhancements for tests

[nulls]

What's done:

• extracted to common place a common methods

It extracted from #1571

[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   161 files  ±0     161 suites  ±0   7m 2s ⏱️ -48s
1 367 tests ±0  1 350 ✔️ ±0  17 💤 ±0  0 ❌ ±0 
2 746 runs  ±0  2 729 ✔️ ±0  17 💤 ±0  0 ❌ ±0 

Results for commit 48ff515. ± Comparison against base commit d6e9848.

♻️ This comment has been updated with latest results.

[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   161 files  ±0     161 suites  ±0   5m 21s ⏱️ -52s
1 367 tests ±0  1 331 ✔️ ±0  36 💤 ±0  0 ❌ ±0 
2 746 runs  ±0  2 710 ✔️ ±0  36 💤 ±0  0 ❌ ±0 

Results for commit 48ff515. ± Comparison against base commit d6e9848.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Merging #1644 (ca2f562) into master (ae84613) will decrease coverage by 0.03%.
The diff coverage is 40.00%.

@@             Coverage Diff              @@
##             master    #1644      +/-   ##
============================================
- Coverage     81.42%   81.40%   -0.03%     
  Complexity     2326     2326              
============================================
  Files           112      112              
  Lines          7892     7894       +2     
  Branches       2048     2048              
============================================
  Hits           6426     6426              
- Misses          566      568       +2     
  Partials        900      900              

Impacted Files	Coverage Δ
...lin/org/cqfn/diktat/plugin/maven/DiktatBaseMojo.kt	0.00% <0.00%> (ø)
.../kotlin/org/cqfn/diktat/ruleset/utils/FileUtils.kt	71.42% <33.33%> (-28.58%)	⬇️
...at/ruleset/rules/chapter3/files/IndentationRule.kt	75.00% <100.00%> (ø)

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