2 files changed, 52 insertions, 16 deletions
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index 30044f1b6c..b6ced686b6 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -896,4 +896,56 @@ class TestBigDecimal < Test::Unit::TestCase
   def test_NAN
     assert(BigDecimal::NAN.nan?, "BigDecimal::NAN is not NaN")
   end
+
+  def test_exp_with_zerp_precision
+    assert_raise(ArgumentError) do
+      BigMath.exp(1, 0)
+    end
+  end
+
+  def test_exp_with_negative_precision
+    assert_raise(ArgumentError) do
+      BigMath.exp(1, -42)
+    end
+  end
+
+  def test_exp_with_complex
+    assert_raise(ArgumentError) do
+      BigMath.exp(Complex(1, 2), 20)
+    end
+  end
+
+  def test_exp_with_negative_infinite
+    BigDecimal.save_exception_mode do
+      BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
+      assert_equal(0, BigMath.exp(-BigDecimal::INFINITY, 20))
+    end
+  end
+
+  def test_exp_with_positive_infinite
+    BigDecimal.save_exception_mode do
+      BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
+      assert(BigMath.exp(BigDecimal::INFINITY, 20) > 0)
+      assert(BigMath.exp(BigDecimal::INFINITY, 20).infinite?)
+    end
+  end
+
+  def test_exp_with_nan
+    BigDecimal.save_exception_mode do
+      BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false)
+      assert(BigMath.exp(BigDecimal::NAN, 20).nan?)
+    end
+  end
+
+  def test_exp_with_1
+    assert_in_epsilon(Math::E, BigMath.exp(1, 20))
+  end
+
+  def test_BigMath_exp
+    n = 20
+    assert_in_epsilon(Math.exp(n), BigMath.exp(BigDecimal("20"), n))
+    assert_in_epsilon(Math.exp(40), BigMath.exp(BigDecimal("40"), n))
+    assert_in_epsilon(Math.exp(-n), BigMath.exp(BigDecimal("-20"), n))
+    assert_in_epsilon(Math.exp(-40), BigMath.exp(BigDecimal("-40"), n))
+  end
 end
diff --git a/test/bigdecimal/test_bigmath.rb b/test/bigdecimal/test_bigmath.rb
index ae3cb9d5f9..fab559a085 100644
--- a/test/bigdecimal/test_bigmath.rb
+++ b/test/bigdecimal/test_bigmath.rb
@@ -61,22 +61,6 @@ class TestBigMath < Test::Unit::TestCase
                  atan(BigDecimal("1.08"), 72).round(72), '[ruby-dev:41257]')
   end
 
-  def test_exp
-    assert_in_epsilon(Math::E, exp(BigDecimal("1"), N))
-    assert_in_epsilon(Math.exp(N), exp(BigDecimal("20"), N))
-    assert_in_epsilon(Math.exp(40), exp(BigDecimal("40"), N))
-    assert_in_epsilon(Math.exp(-N), exp(BigDecimal("-20"), N))
-    assert_in_epsilon(Math.exp(-40), exp(BigDecimal("-40"), N))
-    begin
-      old_mode = BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY)
-      BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
-      assert(exp(BigDecimal::INFINITY, N).infinite?, "exp(INFINITY) is not an infinity")
-    ensure
-      #BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, old_mode)
-    end
-    assert_equal(0.0, exp(-BigDecimal::INFINITY, N))
-  end
-
   def test_log
     assert_in_delta(0.0, log(BigDecimal("1"), N))
     assert_in_delta(1.0, log(E(N), N))