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tests: Ignore tests that requires dot if the executable is not present (#519)

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`@@ -99,6 +99,8 @@ You can now create an instance:`
`99`	`99`	`This state machine can be represented graphically as follows:`
`100`	`100`
`101`	`101`	```py
	`102`	`+>>> # This example will only run on automated tests if dot is present`
	`103`	`+>>> getfixture("requires_dot_installed")`
`102`	`104`	`>>> img_path = "docs/images/readme_trafficlightmachine.png"`
`103`	`105`	`>>> sm._graph().write_png(img_path)`
`104`	`106`

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`@@ -1,3 +1,4 @@`
	`1`	`+import shutil`
`1`	`2`	`import sys`
`2`	`3`
`3`	`4`	`import pytest`
`@@ -31,3 +32,14 @@ def pytest_ignore_collect(collection_path, path, config):`
`31`	`32`
`32`	`33`	`if "django_project" in str(path):`
`33`	`34`	`return True`
	`35`	`+`
	`36`	`+`
	`37`	`+@pytest.fixture(scope="session")`
	`38`	`+def has_dot_installed():`
	`39`	`+ return bool(shutil.which("dot"))`
	`40`	`+`
	`41`	`+`
	`42`	`+@pytest.fixture()`
	`43`	`+def requires_dot_installed(request, has_dot_installed):`
	`44`	`+ if not has_dot_installed:`
	`45`	`+ pytest.skip(f"Test {request.node.nodeid} requires 'dot' that is not installed.")`

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`@@ -74,6 +74,8 @@ If you find the resolution of the image lacking, you can`
`74`	`74`	The current {ref}`state` is also highlighted:
`75`	`75`
`76`	`76`	``` py
	`77`	`+>>> # This example will only run on automated tests if dot is present`
	`78`	`+>>> getfixture("requires_dot_installed")`
`77`	`79`
`78`	`80`	`>>> from statemachine.contrib.diagram import DotGraphMachine`
`79`	`81`

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`@@ -131,6 +131,9 @@ Example:`
`131`	`131`	`Usage:`
`132`	`132`
`133`	`133`	```py
	`134`	`+>>> # This example will only run on automated tests if dot is present`
	`135`	`+>>> getfixture("requires_dot_installed")`
	`136`	`+`
`134`	`137`	`>>> sm = TestStateMachine()`
`135`	`138`
`136`	`139`	`>>> sm._graph().write_png("docs/images/test_state_machine_internal.png")`

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`@@ -7,6 +7,8 @@`
`7`	`7`	`from statemachine.contrib.diagram import main`
`8`	`8`	`from statemachine.contrib.diagram import quickchart_write_svg`
`9`	`9`
	`10`	`+pytestmark = pytest.mark.usefixtures("requires_dot_installed")`
	`11`	`+`
`10`	`12`
`11`	`13`	`@pytest.fixture(`
`12`	`14`	`params=[`

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