Gh-3220: Standardise GafferPop Tests

[p29876]

Related issue

• Resolve #3220

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.07%. Comparing base (b6f0849) to head (f2f07c2).

Files	Patch %	Lines
...a/uk/gov/gchq/gaffer/tinkerpop/GafferPopGraph.java	95.23%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3243 +/- ## ============================================= - Coverage 67.07% 67.07% -0.01% Complexity 2558 2558 ============================================= Files 919 919 Lines 29492 29483 -9 Branches 3288 3289 +1 ============================================= - Hits 19782 19775 -7 Misses 8261 8261 + Partials 1449 1447 -2 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud