Refine error message for time interval

Time interval value can be zero, and float (in `Kernel#sleep`)

1 files changed, 15 insertions, 1 deletions

diff --git a/mrbgems/mruby-sleep/test/sleep_test.rb b/mrbgems/mruby-sleep/test/sleep_test.rb
index 06a6d73fa..f05b7a30b 100644
--- a/mrbgems/mruby-sleep/test/sleep_test.rb
+++ b/mrbgems/mruby-sleep/test/sleep_test.rb
@@ -1,13 +1,27 @@
 assert("sleep works") do
   assert_nothing_raised { sleep(1) }
+  assert_nothing_raised { sleep(0) }
 end
 
-assert("sleep would not accept negative value") do
+assert("sleep would accept non-negative float value") do
+  skip unless Object.const_defined?(:Float)
+  assert_nothing_raised { sleep(0.01) }
+  assert_nothing_raised { sleep(0.0) }
+  assert_nothing_raised { sleep(-0.0) }
+end
+
+assert("sleep would not accept negative integer value") do
   assert_raise(ArgumentError) { sleep(-1) }
 end
 
+assert("sleep would not accept negative float value") do
+  skip unless Object.const_defined?(:Float)
+  assert_raise(ArgumentError) { sleep(-0.1) }
+end
+
 assert("usleep works") do
   assert_nothing_raised { usleep(100) }
+  assert_nothing_raised { usleep(0) }
 end
 
 assert("usleep would not accept negative value") do