diff --git a/tool/lib/test/unit/assertions.rb b/tool/lib/test/unit/assertions.rb
index 6345a625c1..3244913a36 100644
--- a/tool/lib/test/unit/assertions.rb
+++ b/tool/lib/test/unit/assertions.rb
@@ -192,6 +192,22 @@ module Test
         assert obj.nil?, msg
       end
 
+      ##
+      # Fails unless +obj+ is true
+
+      def assert_true obj, msg = nil
+        msg = message(msg) { "Expected #{mu_pp(obj)} to be true" }
+        assert obj == true, msg
+      end
+
+      ##
+      # Fails unless +obj+ is false
+
+      def assert_false obj, msg = nil
+        msg = message(msg) { "Expected #{mu_pp(obj)} to be false" }
+        assert obj == false, msg
+      end
+
       ##
       # For testing with binary operators.
       #