Print tox requires with --print-deps-to

Partially fixes fedora-python#39

This is blocked on tox-dev/tox#1918

src/tox_current_env/hooks.py

@@ -198,10 +198,11 @@ def tox_testenv_install_deps(venv, action):
 
 
 def tox_dependencies(config):
-    """Get dependencies of tox itself, 'minversion' config option"""
-    deps = []
+    """Get dependencies of tox itself, 'minversion' and 'requires' config options"""
+    # tox does not have this option until version 3.??
+    deps = getattr(config, "requires", [])
     if config.minversion is not None:
-        deps.append(f"tox >= {config.minversion}")
+        deps.insert(0, f"tox >= {config.minversion}")
     return deps
 
 

tests/test_integration.py

@@ -168,6 +168,48 @@ def test_print_deps_with_tox_minversion(projdir, toxenv, print_deps_stdout_arg):
     assert result.stdout == expected
 
 
+@pytest.mark.xfail(reason="Waits for support in tox")
+@pytest.mark.parametrize("toxenv", ["py36", "py37", "py38", "py39"])
+def test_print_deps_with_tox_requires(projdir, toxenv, print_deps_stdout_arg):
+    with modify_config(projdir / 'tox.ini') as config:
+        config["tox"]["requires"] = "\n    setuptools > 30\n    pluggy"
+    result = tox("-e", toxenv, print_deps_stdout_arg)
+    expected = textwrap.dedent(
+        f"""
+        setuptools > 30
+        pluggy
+        six
+        py
+        ___________________________________ summary ____________________________________
+          {toxenv}: commands succeeded
+          congratulations :)
+        """
+    ).lstrip()
+    assert result.stdout == expected
+
+
+@pytest.mark.xfail(reason="Waits for support in tox")
+@pytest.mark.parametrize("toxenv", ["py36", "py37", "py38", "py39"])
+def test_print_deps_with_tox_minversion_and_requires(projdir, toxenv, print_deps_stdout_arg):
+    with modify_config(projdir / 'tox.ini') as config:
+        config["tox"]["minversion"] = "3.13"
+        config["tox"]["requires"] = "\n    setuptools > 30\n    pluggy"
+    result = tox("-e", toxenv, print_deps_stdout_arg)
+    expected = textwrap.dedent(
+        f"""
+        tox >= 3.13
+        setuptools > 30
+        pluggy
+        six
+        py
+        ___________________________________ summary ____________________________________
+          {toxenv}: commands succeeded
+          congratulations :)
+        """
+    ).lstrip()
+    assert result.stdout == expected
+
+
 @pytest.mark.parametrize("toxenv", ["py36", "py37", "py38", "py39"])
 def test_print_extras(toxenv, print_extras_stdout_arg):
     result = tox("-e", toxenv, print_extras_stdout_arg)