View the results of configuration file merging via "validate-borgmatic-config --show" flag (#673).

tests/end-to-end/test_validate_config.py

@@ -1,5 +1,6 @@
 import os
 import subprocess
+import sys
 import tempfile
 
 
@@ -26,3 +27,16 @@ def test_validate_config_command_with_invalid_configuration_fails():
         exit_code = subprocess.call(f'validate-borgmatic-config --config {config_path}'.split(' '))
 
         assert exit_code == 1
+
+
+def test_validate_config_command_with_show_flag_displays_configuration():
+    with tempfile.TemporaryDirectory() as temporary_directory:
+        config_path = os.path.join(temporary_directory, 'test.yaml')
+
+        subprocess.check_call(f'generate-borgmatic-config --destination {config_path}'.split(' '))
+        output = subprocess.check_output(
+            f'validate-borgmatic-config --config {config_path} --show'.split(' ')
+        ).decode(sys.stdout.encoding)
+
+        assert 'location:' in output
+        assert 'repositories:' in output