Commit2afc3ad

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Fail hard with tracebacks if pytest-expect isn't working (#360)

Fixes#329

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Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,6 @@`
	`1`	`+from __future__importprint_function`
`1`	`2`	`importos.path`
	`3`	`+importsys`
`2`	`4`
`3`	`5`	`importpkg_resources`
`4`	`6`	`importpytest`
`@@ -15,6 +17,26 @@`
`15`	`17`	`_sanitizer_testdata=os.path.join(_dir,"sanitizer-testdata")`
`16`	`18`
`17`	`19`
	`20`	`+deffail_if_missing_pytest_expect():`
	`21`	`+"""Throws an exception halting pytest if pytest-expect isn't working"""`
	`22`	`+try:`
	`23`	`+frompytest_expectimportexpect# noqa`
	`24`	`+exceptImportError:`
	`25`	`+header=''78`
	`26`	`+print(`
	`27`	`+'\n'+`
	`28`	`+header+'\n'+`
	`29`	`+'ERROR: Either pytest-expect or its dependency u-msgpack-python is not\n'+`
	`30`	`+'installed. Please install them both before running pytest.\n'+`
	`31`	`+header+'\n',`
	`32`	`+file=sys.stderr`
	`33`	`+ )`
	`34`	`+raise`
	`35`	`+`
	`36`	`+`
	`37`	`+fail_if_missing_pytest_expect()`
	`38`	`+`
	`39`	`+`
`18`	`40`	`defpytest_configure(config):`
`19`	`41`	`msgs= []`
`20`	`42`

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