test: Add test of creating AboutDialog

[Czaki]

No description provided.

[deprecated-napari-hub-preview-bot]

Preview page for your plugin is ready here:
https://preview.napari-hub.org/4DNucleome/PartSeg/539

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.35%.

Quality metrics	Before	After	Change
Complexity	0.51 ⭐	0.79 ⭐	0.28 👎
Method Length	71.36 🙂	70.85 🙂	-0.51 👍
Working memory	7.20 🙂	7.19 🙂	-0.01 👍
Quality	73.28% 🙂	72.93% 🙂	-0.35% 👎

Other metrics	Before	After	Change
Lines	566	578	12

Changed files	Quality Before	Quality After	Quality Change
package/PartSeg/common_gui/about_dialog.py	59.92% 🙂	53.80% 🙂	-6.12% 👎
package/tests/test_PartSeg/test_common_gui.py	74.11% 🙂	74.28% 🙂	0.17% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
package/tests/test_PartSeg/test_common_gui.py	TestMultipleFileWidget.test_load_files	1 ⭐	216.97 ⛔	12 😞	52.58% 🙂	Try splitting into smaller methods. Extract out complex expressions
package/PartSeg/common_gui/about_dialog.py	AboutDialog.__init__	6 ⭐	209.99 ⛔	9 🙂	53.80% 🙂	Try splitting into smaller methods
package/tests/test_PartSeg/test_common_gui.py	test_p_load_dialog	1 ⭐	277 ⛔	9 🙂	55.11% 🙂	Try splitting into smaller methods
package/tests/test_PartSeg/test_common_gui.py	test_p_save_dialog	0 ⭐	275 ⛔	9 🙂	56.19% 🙂	Try splitting into smaller methods
package/tests/test_PartSeg/test_common_gui.py	TestMultipleFileWidget.test_load_recent	1 ⭐	178.98 😞	11 😞	57.22% 🙂	Try splitting into smaller methods. Extract out complex expressions

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[deprecated-napari-hub-preview-bot]

Preview page for your plugin is ready here:
https://preview.napari-hub.org/4DNucleome/PartSeg/539

[codecov]

Codecov Report

Merging #539 (b2d9077) into develop (79869cf) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #539      +/-   ##
===========================================
+ Coverage    76.87%   77.01%   +0.14%     
===========================================
  Files          144      144              
  Lines        18585    18597      +12     
===========================================
+ Hits         14287    14323      +36     
+ Misses        4298     4274      -24     

Impacted Files	Coverage Δ
package/PartSeg/common_gui/about_dialog.py	94.28% <100.00%> (+73.07%)	⬆️
...tSeg/plugins/napari_widgets/search_label_widget.py	92.18% <0.00%> (+0.66%)	⬆️

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