# Welcome to PyTestArch
PyTestArch is an open source library that allows users to define architectural rules and test their code against them. It is
generally inspired by [ArchUnit](https://www.archunit.org/).
## Installation Guide
PyTestArch is available via [PyPI](https://pypi.org/project/pytestarch/) and can be installed e.g. via pip: `pip install pytestarch`. To also install the
optional dependency matplotlib, which is required to draw the created dependency graphs, install `pytestarch[visualization]`
## Usage Guide
Three steps are required to test an architectural rule:
1) Create an evaluable representation of the source code you want to test
```
from pytestarch import get_evaluable_architecture
evaluable = get_evaluable_architecture("/home/dummy/project", "/home/dummy/project/src")
```
This will scan all python files under /home/dummy/project/src for imports and build an internal representation that can
later be queried. The first parameter /home/dummy/project helps PyTestArch to differentiate between internal and external
dependencies. This evaluable can be used for multiple architectural rule checks; if you are using [pytest](https://docs.pytest.org/en/7.1.x/),
you could use a fixture for this evaluable object.
2) Define an architectural rule
```
from pytestarch import Rule
rule = (
Rule()
.modules_that()
.are_named("project.src.moduleB")
.should_not()
.be_imported_by_modules_that()
.are_sub_modules_of("project.src.moduleA")
)
```
This rule represents the architectural requirements that a module named "project.src.moduleB" should not be imported by any module
that is a submodule of "project.src.moduleA", excluding "project.src.moduleA" itself.
3) Evaluate your code against this rule
```
rule.assert_applies(evaluable)
```
That's it!
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"description": "# Welcome to PyTestArch\n\nPyTestArch is an open source library that allows users to define architectural rules and test their code against them. It is \ngenerally inspired by [ArchUnit](https://www.archunit.org/).\n\n## Installation Guide\nPyTestArch is available via [PyPI](https://pypi.org/project/pytestarch/) and can be installed e.g. via pip: `pip install pytestarch`. To also install the\noptional dependency matplotlib, which is required to draw the created dependency graphs, install `pytestarch[visualization]`\n\n## Usage Guide\nThree steps are required to test an architectural rule:\n\n1) Create an evaluable representation of the source code you want to test\n\n```\nfrom pytestarch import get_evaluable_architecture\n\nevaluable = get_evaluable_architecture(\"/home/dummy/project\", \"/home/dummy/project/src\")\n```\nThis will scan all python files under /home/dummy/project/src for imports and build an internal representation that can\nlater be queried. The first parameter /home/dummy/project helps PyTestArch to differentiate between internal and external \ndependencies. This evaluable can be used for multiple architectural rule checks; if you are using [pytest](https://docs.pytest.org/en/7.1.x/),\nyou could use a fixture for this evaluable object.\n\n2) Define an architectural rule\n```\nfrom pytestarch import Rule\n\nrule = (\n Rule() \n .modules_that() \n .are_named(\"project.src.moduleB\") \n .should_not() \n .be_imported_by_modules_that() \n .are_sub_modules_of(\"project.src.moduleA\") \n)\n```\n\nThis rule represents the architectural requirements that a module named \"project.src.moduleB\" should not be imported by any module\nthat is a submodule of \"project.src.moduleA\", excluding \"project.src.moduleA\" itself.\n\n3) Evaluate your code against this rule\n\n```\nrule.assert_applies(evaluable)\n```\nThat's it!\n",
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