update function to be mocked during testing.

phasecalculator/test/analysistest/fgipanalysis_test.py

phasecalculator/test/runnerstest/fgipanalysisrunner_test.py

...calculator/test/runnerstest/phasecalculatorrunner_test.py

phasecalculator/test/runnerstest/phasetransferrunner_test.py

...culator/test/runnerstest/similarityanalysisrunner_test.py

phasecalculator/test/runnerstest/vleanalysisrunner_test.py