examples

python/examples/pytest/test_fixture.out

@@ -1,19 +1,14 @@
-setup_module
-
-  setup_function
-    test_one
-42
+setup_module: <TemporaryDirectory '/tmp/tmp18kxxqva'>
+  setup_function <TemporaryDirectory '/tmp/tmp_bd8lazj'>
+    test_one <TemporaryDirectory '/tmp/tmp18kxxqva'> <TemporaryDirectory '/tmp/tmp_bd8lazj'>
     test_one after
-  teardown_function
-
-  setup_function
-    test_two
-  teardown_function
-
-  setup_function
-    test_three
+  teardown_function <TemporaryDirectory '/tmp/tmp_bd8lazj'>
+  setup_function <TemporaryDirectory '/tmp/tmp9k2cbqcb'>
+    test_two <TemporaryDirectory '/tmp/tmp18kxxqva'> <TemporaryDirectory '/tmp/tmp9k2cbqcb'>
+  teardown_function <TemporaryDirectory '/tmp/tmp9k2cbqcb'>
+  setup_function <TemporaryDirectory '/tmp/tmp5u8n90cx'>
+    test_three <TemporaryDirectory '/tmp/tmp18kxxqva'> <TemporaryDirectory '/tmp/tmp5u8n90cx'>
     test_three after
-  teardown_function
+  teardown_function <TemporaryDirectory '/tmp/tmp5u8n90cx'>
+teardown_module <TemporaryDirectory '/tmp/tmp18kxxqva'>
 
-teardown_module
-42

python/examples/pytest/test_fixture.py

@@ -1,34 +1,34 @@
 import tempfile
 
 def setup_module():
-    global db
-    db = tempfile.TemporaryDirectory()
-    print(f"setup_module: {db}")
+    global db_server
+    db_server = tempfile.TemporaryDirectory()
+    print(f"setup_module: {db_server}")
 
 def teardown_module():
-    print("teardown_module")
-    print(db)
+    print(f"teardown_module {db_server}")
 
 
 def setup_function():
-    print("  setup_function")
+    global db
+    db = tempfile.TemporaryDirectory()
+    print(f"  setup_function {db}")
 
 def teardown_function():
-    print("  teardown_function")
+    print(f"  teardown_function {db}")
 
 
 def test_one():
-    print("    test_one")
-    print(db)
+    print(f"    test_one {db_server} {db}")
     assert True
     print("    test_one after")
 
 def test_two():
-    print("    test_two")
+    print(f"    test_two {db_server} {db}")
     assert False
     print("    test_two after")
 
 def test_three():
-    print("    test_three")
+    print(f"    test_three {db_server} {db}")
     assert True
     print("    test_three after")

python/examples/pytest/test_functions.out

@@ -1,13 +1,17 @@
 $ pytest -qqs test_functions.py
 
-setup_db <TemporaryDirectory '/tmp/tmppjc3h7k2'>
-    test_one <TemporaryDirectory '/tmp/tmppjc3h7k2'>
+setup db_server
+new db_serverironment
+setup_db <TemporaryDirectory '/tmp/tmpsqk01wqt'>
+    test_one <TemporaryDirectory '/tmp/tmpsqk01wqt'>
     test_one after
-teardown_db <TemporaryDirectory '/tmp/tmppjc3h7k2'>
-setup_db <TemporaryDirectory '/tmp/tmp_0j_gnnb'>
-    test_two <TemporaryDirectory '/tmp/tmp_0j_gnnb'>
-setup_db <TemporaryDirectory '/tmp/tmpl3gvod_3'>
-    test_three <TemporaryDirectory '/tmp/tmpl3gvod_3'>
+teardown_db <TemporaryDirectory '/tmp/tmpsqk01wqt'>
+setup db_server
+setup_db <TemporaryDirectory '/tmp/tmp8qyhchd6'>
+    test_two <TemporaryDirectory '/tmp/tmp8qyhchd6'>
+setup db_server
+setup_db <TemporaryDirectory '/tmp/tmpu4ei9yc5'>
+    test_three <TemporaryDirectory '/tmp/tmpu4ei9yc5'>
     test_three after
-teardown_db <TemporaryDirectory '/tmp/tmpl3gvod_3'>
+teardown_db <TemporaryDirectory '/tmp/tmpu4ei9yc5'>
 

python/examples/pytest/test_functions.py

@@ -1,25 +1,31 @@
 import tempfile
 
 def test_one():
+    db_server = setup_db_server()
     db = setup_db()
     print(f"    test_one {db}")
     assert True
     print("    test_one after")
     teardown_db(db)
+    # teardown_db_server(db_server)
 
 def test_two():
+    db_server = setup_db_server()
     db = setup_db()
     print(f"    test_two {db}")
     assert False
     print("    test_two after")
     teardown_db(db)
+    # teardown_db_server(db_server)
 
 def test_three():
+    db_server = setup_db_server()
     db = setup_db()
     print(f"    test_three {db}")
     assert True
     print("    test_three after")
     teardown_db(db)
+    # teardown_db_server(db_server)
 
 def setup_db():
     db = tempfile.TemporaryDirectory()
@@ -32,3 +38,13 @@ def teardown_db(db):
     print(f"teardown_db {db}")
 
 
+def setup_db_server():
+    print("setup db_server")
+    if 'db_server' not in setup_db_server.__dict__:
+        print("new db_serverironment")
+        setup_db_server.db_server = tempfile.TemporaryDirectory()
+    return setup_db_server.db_server
+
+def teardown_db_server(db_server):
+    print("teardown_db_server")
+

python/pytest-fixtures.md

@@ -20,6 +20,8 @@ Specific examples:
 ## PyTest: test with functions
 {id: pytest-test-with-functions}
 
+If we don't have any of the fixture services we need to write a lot of code:
+
 * We need to call the `setup_db()` in every test.
 * We need to call the `teardown_db()` in every test - and it still does not work when the test fails.
 * What if there is some work that needs to be done only once and not for every test?