fix: verify correctness of map -> list equality

[frankyn]

Fixes#173

[codecov]

Codecov Report

Merging #174 into master will increase coverage by 58.52%.
The diff coverage is 54.54%.

@@ Coverage Diff @@## master #174 +/- ##
=============================================
+ Coverage 9.23% 67.76% +58.52% - Complexity 32 378 +346 
=============================================
Files 36 36 Lines 1959 1967 +8 Branches 254 259 +5 =============================================
+ Hits 181 1333 +1152 + Misses 1766 526 -1240 - Partials 12 108 +96

Impacted Files	Coverage Δ	Complexity Δ
...ud-core/src/main/java/com/google/cloud/Policy.java	92.07% <54.54%> (+92.07%)	20 <0> (+20)	⬆️
...a/com/google/cloud/testing/BaseEmulatorHelper.java	31.39% <0%> (+31.39%)	5% <0%> (+5%)	⬆️
...c/main/java/com/google/cloud/BaseWriteChannel.java	36.5% <0%> (+36.5%)	18% <0%> (+18%)	⬆️
...src/main/java/com/google/cloud/ServiceOptions.java	43.42% <0%> (+43.42%)	32% <0%> (+32%)	⬆️
...core/src/main/java/com/google/cloud/ByteArray.java	46.66% <0%> (+46.66%)	12% <0%> (+12%)	⬆️
...re/src/main/java/com/google/cloud/RetryHelper.java	53.84% <0%> (+53.84%)	2% <0%> (+2%)	⬆️
.../src/main/java/com/google/cloud/NoCredentials.java	60% <0%> (+60%)	4% <0%> (+4%)	⬆️
...-core/src/main/java/com/google/cloud/PageImpl.java	61.11% <0%> (+61.11%)	8% <0%> (+8%)	⬆️
...re/src/main/java/com/google/cloud/BaseService.java	62.5% <0%> (+62.5%)	2% <0%> (+2%)	⬆️
.../src/main/java/com/google/cloud/AsyncPageImpl.java	64.28% <0%> (+64.28%)	2% <0%> (+2%)	⬆️
... and 19 more

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