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diff --git a/test-requirements.txt b/test-requirements.txt
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--- a/test-requirements.txt
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+++ b/test-requirements.txt
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@@ -1,5 +1,5 @@
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-mock==1.0.1
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-pytest==2.9.1
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-coverage==3.7.1
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-pytest-cov==2.1.0
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-flake8==3.4.1
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+mock>=1.0.1
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+pytest>=2.9.1
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+coverage>=3.7.1
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+pytest-cov>=2.1.0
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+flake8>=3.4.1
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-- 
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2.9.0
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