Micrometer tests flakiness - replace Mockito's when with doReturn

[eyalkoren]

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[ghost]

💚 Build Succeeded

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• Build Cause: Started by user eyalkoren

• Start Time: 2021-03-21T11:04:10.164+0000

• Duration: 49 min 57 sec

• Commit: 8c1d4ff

Test stats 🧪

Test	Results
Failed	0
Passed	1883
Skipped	15
Total	1898

Trends 🧪

💚 Flaky test report

Tests succeeded.

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Test stats 🧪

Test	Results
Failed	0
Passed	1883
Skipped	15
Total	1898

[codecov-io]

Codecov Report

Merging #1709 (8c1d4ff) into master (1826182) will decrease coverage by 5.10%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1709      +/-   ##
============================================
- Coverage     63.52%   58.41%   -5.11%     
+ Complexity     3283     2867     -416     
============================================
  Files           331      422      +91     
  Lines         16186    18832    +2646     
  Branches       2223     2610     +387     
============================================
+ Hits          10282    11001     +719     
- Misses         5168     7058    +1890     
- Partials        736      773      +37     

Impacted Files	Coverage Δ	Complexity Δ
...nt/configuration/converter/ListValueConverter.java	43.47% <0.00%> (-39.86%)	4.00% <0.00%> (ø%)
...ration/source/PropertyFileConfigurationSource.java	32.89% <0.00%> (-38.54%)	10.00% <0.00%> (ø%)
...c/main/java/co/elastic/apm/agent/util/IOUtils.java	56.60% <0.00%> (-34.31%)	16.00% <0.00%> (ø%)
...tion/source/SystemPropertyConfigurationSource.java	23.07% <0.00%> (-26.93%)	3.00% <0.00%> (ø%)
.../v5_6/ElasticsearchClientAsyncInstrumentation.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...stic/apm/agent/kafka/BaseKafkaInstrumentation.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...t/kafka/helper/ConsumerRecordsIterableWrapper.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...ent/dubbo/AlibabaMonitorFilterInstrumentation.java	100.00% <0.00%> (ø)	0.00% <0.00%> (?%)
.../agent/dubbo/AlibabaRpcContextInstrumentation.java	62.50% <0.00%> (ø)	0.00% <0.00%> (?%)
...a/co/elastic/apm/opentracing/ElasticApmTracer.java	76.19% <0.00%> (ø)	9.00% <0.00%> (?%)
... and 87 more

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