🎉 Source Zendesk Chat: increase unit_test coverage up to 90%

[bazarnov]

What

Resolving: #15715

How

• added test_streams.py unit tests
• added test_source.py unit_tests

[bazarnov]

/test connector=connectors/source-zendesk-chat

🕑 connectors/source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/2925866299
✅ connectors/source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/2925866299
Python tests coverage:

Name                              Stmts   Miss  Cover
-----------------------------------------------------
source_zendesk_chat/__init__.py       2      0   100%
source_zendesk_chat/source.py        26      1    96%
source_zendesk_chat/streams.py      151     13    91%
-----------------------------------------------------
TOTAL                               179     14    92%
	 Name                                                 Stmts   Miss  Cover   Missing
	 ----------------------------------------------------------------------------------
	 source_acceptance_test/base.py                          10      4    60%   15-18
	 source_acceptance_test/config.py                        83      6    93%   78-80, 84-86
	 source_acceptance_test/conftest.py                     164    164     0%   6-282
	 source_acceptance_test/plugin.py                        48     48     0%   6-104
	 source_acceptance_test/tests/test_core.py              329    111    66%   39, 50-58, 63-70, 74-75, 79-80, 164, 202-219, 228-236, 240-245, 251, 284-289, 327-334, 374-376, 379, 439-448, 477-478, 484, 487, 520-530, 543-568, 573-577
	 source_acceptance_test/tests/test_full_refresh.py       52      2    96%   34, 65
	 source_acceptance_test/tests/test_incremental.py       121     25    79%   21-23, 29-31, 36-43, 48-61, 208-216
	 source_acceptance_test/utils/asserts.py                 37      2    95%   57-58
	 source_acceptance_test/utils/common.py                  77     17    78%   15-16, 24-30, 47-54, 64, 67
	 source_acceptance_test/utils/compare.py                 62     23    63%   21-51, 68, 97-99
	 source_acceptance_test/utils/connector_runner.py       110     48    56%   23-26, 32, 36, 39-64, 67-69, 72-74, 77-79, 82-84, 87-89, 92-110, 144-146
	 source_acceptance_test/utils/json_schema_helper.py     105     13    88%   30-31, 38, 41, 65-68, 96, 120, 190-192
	 ----------------------------------------------------------------------------------
	 TOTAL                                                 1322    463    65%

Build Passed

Test summary info:

=========================== short test summary info ============================
SKIPPED [1] ../usr/local/lib/python3.9/site-packages/source_acceptance_test/tests/test_incremental.py:23: `future_state_path` not specified, skipping
================== 50 passed, 1 skipped in 448.71s (0:07:28) ===================