[welcome] Add debugging checks slow-false and slow-true

src/modules/welcome/checker/GeneralRequirements.cpp

@@ -228,6 +228,15 @@ GeneralRequirements::checkRequirements()
                                    false,
                                    required } );
         }
+        if ( entry == "slow-false" )
+        {
+            sleep(3);
+            checkEntries.append( { entry,
+                                   [] { return tr( "is always false (slowly)" ); },
+                                   [] { return tr( "The computer says no (slowly)." ); },
+                                   false,
+                                   required } );
+        }
         if ( entry == "true" )
         {
             checkEntries.append( { entry,
@@ -236,6 +245,15 @@ GeneralRequirements::checkRequirements()
                                    true,
                                    required } );
         }
+        if ( entry == "slow-true" )
+        {
+            sleep(3);
+            checkEntries.append( { entry,
+                                   [] { return tr( "is always true (slowly)" ); },
+                                   [] { return tr( "The computer says yes (slowly)." ); },
+                                   true,
+                                   required } );
+        }
         if ( entry == "snark" )
         {
             static unsigned int snark_count = 0;

src/modules/welcome/welcome.conf

@@ -67,9 +67,13 @@ requirements:
     #
     # Note that the last three checks are for testing-purposes only,
     # and shouldn't be used in production (they are only available
-    # when building Calamares in development mode):
+    # when building Calamares in development mode). There are five
+    # special checks:
     # - *false* is a check that is always false (unsatisfied)
     # - *true* is a check that is always true (satisfied)
+    # - *slow-false* takes 3 seconds, and then is false; use this one to
+    #   show off the waiting-spinner before the first results come in
+    # - *slow-true* takes 3 seconds, and then is true
     # - *snark* is a check that is only satisfied once it has been checked
     #   at least three times ("what I tell you three times is true").
     check: