1 files changed, 21 insertions, 0 deletions
diff --git a/test/ruby/test_prec.rb b/test/ruby/test_prec.rb
new file mode 100644
index 0000000000..d872242c11
--- /dev/null
+++ b/test/ruby/test_prec.rb
@@ -0,0 +1,21 @@
+require 'test/unit'
+
+class TestPrecision < Test::Unit::TestCase
+  def test_prec_i
+    assert_same(1, 1.0.prec(Integer))
+    assert_same(1, 1.0.prec_i)
+    assert_same(1, Integer.induced_from(1.0))
+  end
+
+  def test_prec_f
+    assert_equal(1.0, 1.prec(Float))
+    assert_equal(1.0, 1.prec_f)
+    assert_equal(1.0, Float.induced_from(1))
+  end
+
+  def test_induced_from
+    m = Module.new
+    m.instance_eval { include(Precision) }
+    assert_raise(TypeError) { m.induced_from(0) }
+  end
+end