Fix decreased coverage

Author: atugushev

tests/test_cli_compile.py

@@ -2925,3 +2925,15 @@ def test_compile_recursive_extras(runner, tmp_path, current_resolver):
 """
     assert out.exit_code == 0
     assert expected == out.stderr
+
+
+def test_config_option(pip_conf, runner, tmp_path, make_config_file):
+    config_file = make_config_file("dry-run", True)
+
+    req_in = tmp_path / "requirements.in"
+    req_in.touch()
+
+    out = runner.invoke(cli, [req_in.as_posix(), "--config", config_file.as_posix()])
+
+    assert out.exit_code == 0
+    assert "Dry-run, so nothing updated" in out.stderr

tests/test_cli_sync.py

@@ -372,3 +372,16 @@ def test_default_python_executable_option(run, runner):
             "-r",
         ]
     ]
+
+
+@mock.patch("piptools.sync.run")
+def test_config_option(run, runner, make_config_file):
+    config_file = make_config_file("dry-run", True)
+
+    with open(sync.DEFAULT_REQUIREMENTS_FILE, "w") as reqs_txt:
+        reqs_txt.write("six==1.10.0")
+
+    out = runner.invoke(cli, ["--config", config_file.as_posix()])
+
+    assert out.exit_code == 1
+    assert "Would install:" in out.stdout