Add assert_float to test environment

test/assert.rb

@@ -178,6 +178,14 @@ def assert_kind_of(cls, obj, msg = nil)
   assert_true(obj.kind_of?(cls), msg, diff)
 end
 
+##
+# Fails unless +exp+ is equal to +act+ in terms of a Float
+def assert_float(exp, act, msg = nil)
+  msg = "Float #{exp} expected to be equal to float #{act}" unless msg
+  diff = assertion_diff(exp, act)
+  assert_true check_float(exp, act), msg, diff
+end
+
 ##
 # Report the test result and print all assertions
 # which were reported broken.