add

python/examples/pytest/key-value-store-outside/store.json

@@ -0,0 +1,5 @@
+{
+    "color": "Red",
+    "pid": 2997265,
+    "size": "42"
+}

python/examples/pytest/key-value-store-outside/test_store.py

@@ -1,8 +1,9 @@
 import os
+import store
 
 def test_store(tmpdir):
     os.environ['STORE_DIR'] = str(tmpdir) # str expected, not LocalPath
-    import store
+    print(os.environ['STORE_DIR'])
     store.set('color', 'Blue')
     assert store.get('color') == 'Blue'
 

python/examples/pytest/test_parametrized_fixture.out

@@ -0,0 +1,8 @@
+Fixture before test using apple
+Test using apple
+Fixture after test using apple
+
+Fixture before test using banana
+Test not using param
+Fixture after test using banana
+

python/examples/pytest/test_parametrized_injection_fixture.out

@@ -0,0 +1,7 @@
+Fixture before test using apple
+Test using apple
+Fixture after test using apple
+Fixture before test using banana
+Test not using param
+Fixture after test using banana
+

python/examples/pytest/test_parametrized_injection_fixture.py

@@ -0,0 +1,20 @@
+import os
+import pathlib
+import time
+import pytest
+
+
+@pytest.fixture(params=["name"])
+def generate(name):
+    print(f"Fixture before test using {name}")
+    yield
+    print(f"Fixture after test using {name}")
+
+@pytest.mark.parametrize("name", ["apple"])
+def test_with_param(name, generate):
+    print(f"Test using {name}")
+
+@pytest.mark.parametrize("name", ["banana"])
+def test_without_param(generate):
+    print(f"Test not using param")
+

python/pytest-fixtures.md

@@ -145,12 +145,17 @@ def serve_bolognese(pasta, sauce):
 ## Pytest CLI key-value store
 {id: pytest-cli-key-value-store}
 
+* This is a similar application - a file-base key-value store - where the data files is computed from the name of the program: `store.json`.
+* Runing two tests in parallel will make the tests collide by using the same data file.
+
 ![](examples/pytest/key-value-store/store.py)
 ![](examples/pytest/key-value-store/test_store.py)
 
 ## Pytest testing key-value store - environment variable
 {id: pytest-cli-testing-key-value-store}
 
+* We need to be able to set the name of the data file externally. e.g. Using an environment variable.
+
 ![](examples/pytest/key-value-store-testable/store.py)
 ![](examples/pytest/key-value-store-testable/test_store.py)
 
@@ -171,6 +176,7 @@ def serve_bolognese(pasta, sauce):
 
 ## Pytest capture STDOUT and STDERR with capsys
 {id: pytest-capsys}
+{i: capsys}
 
 Captures everything that is printed to STDOUT and STDERR so we can compare that to the expected output and error.
 
@@ -180,6 +186,16 @@ Captures everything that is printed to STDOUT and STDERR so we can compare that
 pytest test_greet.py
 ```
 
+## PyTest - write your own fixture
+{id: pytest-write-your-own-fixture}
+
+* `tmpdir` and `capsys` are nice to have, but we will need more complex setup and teardown.
+
+* We can write any function to become fixture, we only need to decorate it with `@pytest.fixture`
+
+* We can implement fixture functions to act like the xUnit fixture we saw ealrier or using dependency injection as `tmpdir` and `capsys` work.
+
+
 ## Pytest Fixture - autouse fixtures
 {id: pytest-autouse-fixture}
 {i: yield}
@@ -288,6 +304,11 @@ $ pytest -sq
 
 ![](examples/pytest/fixture-mongodb/conftest.py)
 
+## Pytest parameters
+{id: pytest-parameters}
+
+![](examples/pytest/test_mymath_parameters.py)
+
 ## Pytest parametrized fixture
 {id: pytest-parametrized-fixture}
 
@@ -296,16 +317,14 @@ Sometimes we would like to pass some parameters to the fixture. We can do this w
 {/aside}
 
 ![](examples/pytest/test_parametrized_fixture.py)
+![](examples/pytest/test_parametrized_fixture.out)
 
-```
-Fixture before test using apple
-Test using apple
-Fixture after test using apple
+## Pytest parametrized fixture with dependency injection
+{id: pytest-parametrized-fixture-with-dependency-injection}
 
-Fixture before test using banana
-Test not using param
-Fixture after test using banana
-```
+
+![](examples/pytest/test_parametrized_injection_fixture.py)
+![](examples/pytest/test_parametrized_injection_fixture.out)
 
 ## Pytest parametrized fixture to use Docker
 {id: pytest-parametrized-fixture-to-use-docker}
@@ -317,7 +336,4 @@ At one point I wanted the whole image creation and running in the image be part
 
 ![](examples/pytest/test_parametrized_fixture_with_docker.py)
 
-## Pytest parameters
-{id: pytest-parameters}
 
-![](examples/pytest/test_mymath_parameters.py)