automatic: Tests for no updates functionality

dnf-behave-tests/dnf/dnf-automatic/emit-no-updates.feature

@@ -0,0 +1,21 @@
+@dnf5
+Feature: dnf-automatic does not emit when no updates are available
+
+
+Scenario: dnf-automatic does not emit when no updates are available
+   When I execute dnf with args "automatic --installupdates"
+   Then the exit code is 0
+    And Transaction is empty
+    And stdout is empty
+
+
+Scenario: dnf-automatic emits message when no updates are available when emit_no_updates is on
+  Given I create file "/etc/dnf/automatic.conf" with
+    """
+    [emitters]
+    emit_no_updates = yes
+    """
+   When I execute dnf with args "automatic --installupdates"
+   Then the exit code is 0
+    And Transaction is empty
+    And stdout contains "No new upgrades available."