Add tests to verify --output reg options are handled correctly.

Signed-off-by: Eric Promislow <epromislow@suse.com>

bats/tests/preferences/list-settings-output.bats

@@ -54,6 +54,38 @@ RD_USE_IMAGE_ALLOW_LIST=true
     done
 }
 
+@test 'generates registry output for hklm/defaults' {
+    for option in reg reg,hklm reg,hklm,defaults reg,defaults; do
+        run rdctl list-settings --output "$option"
+        assert_success
+        assert_output --partial '[HKEY_LOCAL_MACHINE\SOFTWARE\Profiles\Rancher Desktop\defaults\application]'
+    done
+}
+
+@test 'generates registry output for hklm/locked' {
+    for option in reg,hklm,locked reg,locked; do
+        run rdctl list-settings --output "$option"
+        assert_success
+        assert_output --partial '[HKEY_LOCAL_MACHINE\SOFTWARE\Profiles\Rancher Desktop\locked\application]'
+    done
+}
+
+@test 'generates registry output for hkcu/defaults' {
+    for option in reg,hkcu,defaults reg,hkcu; do
+        run rdctl list-settings --output "$option"
+        assert_success
+        assert_output --partial '[HKEY_CURRENT_USER\SOFTWARE\Profiles\Rancher Desktop\defaults\application]'
+    done
+}
+
+@test 'generates registry output for hkcu/locked' {
+    run rdctl list-settings --output reg,hkcu,locked
+    assert_success
+    assert_output --partial '[HKEY_CURRENT_USER\SOFTWARE\Profiles\Rancher Desktop\locked\application]'
+}
+
+# The result of the `assert_output` for heredocuments looks suspicious (I see it always passing),
+# but this serves to document the expected full reg output
 @test 'generates registry output' {
     run rdctl list-settings --output reg
     assert_success