test: drop old checks in docker-gen tests

docker engine 1.13 has been out for more than 8 years now

test/test_dockergen/test_dockergen.py

@@ -1,15 +1,3 @@
-import docker
-import pytest
-from packaging.version import Version
-
-
-raw_version = docker.from_env().version()["Version"]
-pytestmark = pytest.mark.skipif(
-    Version(raw_version) < Version("1.13"),
-    reason="Docker compose syntax v3 requires docker engine v1.13 or later (got {raw_version})"
-)
-
-
 def test_unknown_virtual_host_is_503(docker_compose, nginxproxy):
     r = nginxproxy.get("http://unknown.nginx-proxy.tld/")
     assert r.status_code == 503
@@ -20,8 +8,3 @@ def test_forwards_to_whoami(docker_compose, nginxproxy):
     assert r.status_code == 200
     whoami_container = docker_compose.containers.get("whoami")
     assert r.text == f"I'm {whoami_container.id[:12]}\n"
-
-
-if __name__ == "__main__":
-    import doctest
-    doctest.testmod()

test/test_dockergen/test_dockergen_network_segregation-custom-label.py

@@ -1,15 +1,3 @@
-import docker
-import pytest
-from packaging.version import Version
-
-
-raw_version = docker.from_env().version()["Version"]
-pytestmark = pytest.mark.skipif(
-    Version(raw_version) < Version("1.13"),
-    reason="Docker compose syntax v3 requires docker engine v1.13 or later (got {raw_version})"
-)
-
-
 def test_unknown_virtual_host_is_503(docker_compose, nginxproxy):
     r = nginxproxy.get("http://unknown.nginx-proxy.tld/")
     assert r.status_code == 503
@@ -20,8 +8,3 @@ def test_forwards_to_whoami(docker_compose, nginxproxy):
     assert r.status_code == 200
     whoami_container = docker_compose.containers.get("whoami2")
     assert r.text == f"I'm {whoami_container.id[:12]}\n"
-
-
-if __name__ == "__main__":
-    import doctest
-    doctest.testmod()

test/test_dockergen/test_dockergen_network_segregation.py

@@ -1,15 +1,3 @@
-import docker
-import pytest
-from packaging.version import Version
-
-
-raw_version = docker.from_env().version()["Version"]
-pytestmark = pytest.mark.skipif(
-    Version(raw_version) < Version("1.13"),
-    reason="Docker compose syntax v3 requires docker engine v1.13 or later (got {raw_version})"
-)
-
-
 def test_unknown_virtual_host_is_503(docker_compose, nginxproxy):
     r = nginxproxy.get("http://unknown.nginx-proxy.tld/")
     assert r.status_code == 503
@@ -20,8 +8,3 @@ def test_forwards_to_whoami(docker_compose, nginxproxy):
     assert r.status_code == 200
     whoami_container = docker_compose.containers.get("whoami2")
     assert r.text == f"I'm {whoami_container.id[:12]}\n"
-
-
-if __name__ == "__main__":
-    import doctest
-    doctest.testmod()