updated tests to use the new read/write functions

16 jobs for master in 5 minutes and 18 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #42151
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build-2.7-linux

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build-2.7-macos

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build-3.5-linux

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Apple
build-3.5-macos

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VS2017
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  Test
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Linux
test-2.7-linux

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Apple
test-2.7-macos

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passed #42154
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test-3.5-linux

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Apple
test-3.5-macos

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passed #42153
VS2017
test-3.6-VS2017

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  Deploy
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Linux
deploy-2.7-linux

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Apple
deploy-2.7-macos

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deploy-3.5-linux

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Apple
deploy-3.5-macos

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VS2017
deploy-3.6-VS2017

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passed #42163
Linux
deploy-documentation

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