1 files changed, 7 insertions, 1 deletions
diff --git a/mrbgems/mruby-complex/test/complex.rb b/mrbgems/mruby-complex/test/complex.rb
index e7fcc7322..6996eb214 100644
--- a/mrbgems/mruby-complex/test/complex.rb
+++ b/mrbgems/mruby-complex/test/complex.rb
@@ -1,5 +1,5 @@
 def assert_complex(real, exp)
-  assert_float real.real,      exp.real           
+  assert_float real.real,      exp.real
   assert_float real.imaginary, exp.imaginary
 end
 
@@ -126,3 +126,9 @@ assert 'Complex::to_i' do
     Complex(1, 2).to_i
   end
 end
+
+assert 'Complex#frozen?' do
+  assert_predicate(1i, :frozen?)
+  assert_predicate(Complex(2,3), :frozen?)
+  assert_predicate(4+5i, :frozen?)
+end