fix: added return value and test for signatures

[lpetrovic05]

closes #252

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JUnit Test Report

     48 files  ±0       48 suites  ±0   2m 40s :stopwatch: -28s 1 138 tests +1  1 137 :heavy_check_mark: +1    1 :zzz: ±0  0 :x: ±0  6 993 runs  +1  6 976 :heavy_check_mark: +1  17 :zzz: ±0  0 :x: ±0 

Results for commit 10e2f5f7. ± Comparison against base commit 80df99ba.

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.03% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (80df99bac7b2c2e4da058c7b6bb178395a2e4bb3) | 4363 | 1979 | 45.36% | | | Head commit (10e2f5f7d9320d12c73d153c3bca638a37e45326) | 4361 (-2) | 1977 (-2) | 45.33% (**-0.03%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#253) | 2 | 2 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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Integration Test Report

     274 files  ±0       274 suites  ±0   6m 6s :stopwatch: - 2m 13s 96 654 tests ±0  96 654 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  96 882 runs  ±0  96 882 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 10e2f5f7. ± Comparison against base commit 80df99ba.