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TestLogitLocator: append a test on nonsingular to avoid issues as#14743

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lib/matplotlib/tests
- test_ticker.py

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`‎lib/matplotlib/tests/test_ticker.py`

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Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,6 @@`
`1`	`1`	`importwarnings`
`2`	`2`	`importre`
	`3`	`+importitertools`
`3`	`4`
`4`	`5`	`importnumpyasnp`
`5`	`6`	`fromnumpy.testingimportassert_almost_equal,assert_array_equal`
`@@ -366,6 +367,46 @@ def test_minor_attr(self):`
`366`	`367`	`loc.set_params(minor=False)`
`367`	`368`	`assertnotloc.minor`
`368`	`369`
	`370`	`+acceptable_vmin_vmax= [`
	`371`	`+(2.5*np.arange(-3,0)),`
	`372`	`+(1-2.5*np.arange(-3,0)),`
	`373`	`+ ]`
	`374`	`+`
	`375`	`+@pytest.mark.parametrize(`
	`376`	`+"lims",`
	`377`	`+ [`
	`378`	`+ (a,b)`
	`379`	`+for (a,b)initertools.product(`
	`380`	`+acceptable_vmin_vmax,acceptable_vmin_vmax`
	`381`	`+ )`
	`382`	`+ifa!=b`
	`383`	`+ ],`
	`384`	`+ )`
	`385`	`+deftest_nonsingular_ok(self,lims):`
	`386`	`+"""`
	`387`	`+ Create logit locator, and test the nonsingular method for acceptable`
	`388`	`+ value`
	`389`	`+ """`
	`390`	`+loc=mticker.LogitLocator()`
	`391`	`+lims2=loc.nonsingular(*lims)`
	`392`	`+assertlims==lims2`
	`393`	`+`
	`394`	`+@pytest.mark.parametrize("okval",acceptable_vmin_vmax)`
	`395`	`+deftest_nonsingular_nok(self,okval):`
	`396`	`+"""`
	`397`	`+ Create logit locator, and test the nonsingular method for non`
	`398`	`+ acceptable value`
	`399`	`+ """`
	`400`	`+loc=mticker.LogitLocator()`
	`401`	`+vmin,vmax= (-1,okval)`
	`402`	`+vmin2,vmax2=loc.nonsingular(vmin,vmax)`
	`403`	`+assertvmax2==vmax`
	`404`	`+assert0<vmin2<vmax2`
	`405`	`+vmin,vmax= (okval,2)`
	`406`	`+vmin2,vmax2=loc.nonsingular(vmin,vmax)`
	`407`	`+assertvmin2==vmin`
	`408`	`+assertvmin2<vmax2<1`
	`409`	`+`
`369`	`410`
`370`	`411`	`classTestFixedLocator:`
`371`	`412`	`deftest_set_params(self):`

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`‎lib/matplotlib/tests/test_ticker.py`

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