Added basic tests for the CLI

tests/test_cli_config.py

@@ -0,0 +1,18 @@
+from click.testing import CliRunner
+from pyfiguration import cli
+
+
+def test_cli_module():
+    runner = CliRunner()
+    result = runner.invoke(
+        cli,
+        [
+            "config",
+            "./examples/basic/basic.py",
+            "--config",
+            "./examples/basic/config/defaults",
+            "./examples/basic/config/deployments/a.yaml",
+        ],
+    )
+    assert result.exit_code == 0
+    assert result.output == ""

tests/test_cli_module.py

@@ -0,0 +1,11 @@
+from click.testing import CliRunner
+from pyfiguration import cli
+
+
+def test_cli_module():
+    runner = CliRunner()
+    result = runner.invoke(cli, ["module", "./examples/basic/basic.py"])
+    assert result.exit_code == 0
+    assert result.output.startswith(
+        "The following options can be used in a configuration file for the module"
+    )