https://git.ruby-lang.org/ruby.git/commit/?id=bd8aa047fc

From bd8aa047fc506b18d51fd791b8920d1e3bc72354 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 17 May 2020 19:03:05 +0900
Subject: Removed useless implementation tests


diff --git a/test/ruby/test_rand.rb b/test/ruby/test_rand.rb
index 06f09df..2fcac2d 100644
--- a/test/ruby/test_rand.rb
+++ b/test/ruby/test_rand.rb
@@ -198,110 +198,6 @@ class TestRand < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rand.rb#L198
     end
   end
 
-  def test_random_state
-    state = <<END
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-2254080
-END
-    state = state.split.join.to_i
-    r = Random.new(0)
-    srand(0)
-    assert_equal(state, r.instance_eval { state })
-    assert_equal(state, Random.instance_eval { state })
-    r.rand(0x100)
-    assert_equal(state, r.instance_eval { state })
-  end
-
-  def test_random_left
-    r = Random.new(0)
-    assert_equal(1, r.instance_eval { left })
-    r.rand(0x100)
-    assert_equal(624, r.instance_eval { left })
-    r.rand(0x100)
-    assert_equal(623, r.instance_eval { left })
-    srand(0)
-    assert_equal(1, Random.instance_eval { left })
-    rand(0x100)
-    assert_equal(624, Random.instance_eval { left })
-    rand(0x100)
-    assert_equal(623, Random.instance_eval { left })
-  end
-
   def test_random_bytes
     srand(0)
     r = Random.new(0)
@@ -334,11 +230,15 @@ END https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rand.rb#L230
 
   def test_random_float
     r = Random.new(0)
-    assert_in_delta(0.5488135039273248, r.rand, 0.0001)
-    assert_in_delta(0.7151893663724195, r.rand, 0.0001)
-    assert_in_delta(0.6027633760716439, r.rand, 0.0001)
-    assert_in_delta(1.0897663659937937, r.rand(2.0), 0.0001)
-    assert_in_delta(5.3704626067153264e+29, r.rand((2**100).to_f), 10**25)
+    3.times do
+      assert_include(0...1.0, r.rand)
+    end
+    [2.0, (2**100).to_f].each do |x|
+      range = 0...x
+      3.times do
+        assert_include(range, r.rand(x), "rand(#{x})")
+      end
+    end
 
     assert_raise(Errno::EDOM, Errno::ERANGE) { r.rand(1.0 / 0.0) }
     assert_raise(Errno::EDOM, Errno::ERANGE) { r.rand(0.0 / 0.0) }
@@ -346,10 +246,11 @@ END https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rand.rb#L246
     assert_raise(Errno::EDOM) {r.rand(..1)}
 
     r = Random.new(0)
-    assert_in_delta(1.5488135039273248, r.rand(1.0...2.0), 0.0001, '[ruby-core:24655]')
-    assert_in_delta(1.7151893663724195, r.rand(1.0...2.0), 0.0001, '[ruby-core:24655]')
-    assert_in_delta(7.027633760716439, r.rand(1.0...11.0), 0.0001, '[ruby-core:24655]')
-    assert_in_delta(3.0897663659937937, r.rand(2.0...4.0), 0.0001, '[ruby-core:24655]')
+    [1.0...2.0, 1.0...11.0, 2.0...4.0].each do |range|
+      3.times do
+        assert_include(range, r.rand(range), "[ruby-core:24655] rand(#{range})")
+      end
+    end
 
     assert_nothing_raised {r.rand(-Float::MAX..Float::MAX)}
   end
-- 
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