Add additional assertions to DatabaseClientImplTest.

[kolea2]

No description provided.

[codecov]

Codecov Report

Merging #5715 into master will decrease coverage by 0.66%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5715 +/- ##
============================================
- Coverage 46.74% 46.07% -0.67% + Complexity 24664 23245 -1419 
============================================
Files 2352 2352 Lines 256327 251175 -5152 Branches 29359 28419 -940 ============================================
- Hits 119812 115725 -4087 + Misses 127582 126665 -917 + Partials 8933 8785 -148

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/google/cloud/storage/StorageBatch.java	88% <0%> (-4%)	13% <0%> (ø)
...m/google/cloud/vision/v1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p4beta1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p3beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
...e/cloud/vision/v1p2beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
.../java/com/google/cloud/speech/v1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...om/google/cloud/speech/v1p1beta1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...d/webrisk/v1beta1/WebRiskServiceV1Beta1Client.java	63.41% <0%> (-2.5%)	12% <0%> (-3%)
...ogle/cloud/texttospeech/v1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
...cloud/texttospeech/v1beta1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
... and 625 more

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