1 files changed, 39 insertions, 0 deletions
diff --git a/spec/ruby/library/cmath/math/shared/log.rb b/spec/ruby/library/cmath/math/shared/log.rb
new file mode 100644
index 0000000000..4b23e8c5f2
--- /dev/null
+++ b/spec/ruby/library/cmath/math/shared/log.rb
@@ -0,0 +1,39 @@
+require_relative '../fixtures/classes'
+
+describe :complex_math_log, shared: true do
+  it "returns the natural logarithm of the passed argument" do
+    @object.send(:log, 0.0001).should be_close(-9.21034037197618, TOLERANCE)
+    @object.send(:log, 0.000000000001e-15).should be_close(-62.1697975108392, TOLERANCE)
+    @object.send(:log, 1).should be_close(0.0, TOLERANCE)
+    @object.send(:log, 10).should be_close( 2.30258509299405, TOLERANCE)
+    @object.send(:log, 10e15).should be_close(36.8413614879047, TOLERANCE)
+  end
+
+  it "returns the natural logarithm for Complex numbers" do
+    @object.send(:log, Complex(3, 4)).should be_close(Complex(1.6094379124341, 0.927295218001612), TOLERANCE)
+    @object.send(:log, Complex(-3, 4)).should be_close(Complex(1.6094379124341, 2.21429743558818), TOLERANCE)
+  end
+
+  it "returns the natural logarithm for negative numbers as a Complex number" do
+    @object.send(:log, -10).should be_close(Complex(2.30258509299405, 3.14159265358979), TOLERANCE)
+    @object.send(:log, -20).should be_close(Complex(2.99573227355399, 3.14159265358979), TOLERANCE)
+  end
+end
+
+describe :complex_math_log_bang, shared: true do
+  it "returns the natural logarithm of the argument" do
+    @object.send(:log!, 0.0001).should be_close(-9.21034037197618, TOLERANCE)
+    @object.send(:log!, 0.000000000001e-15).should be_close(-62.1697975108392, TOLERANCE)
+    @object.send(:log!, 1).should be_close(0.0, TOLERANCE)
+    @object.send(:log!, 10).should be_close( 2.30258509299405, TOLERANCE)
+    @object.send(:log!, 10e15).should be_close(36.8413614879047, TOLERANCE)
+  end
+
+  it "raises an Errno::EDOM if the argument is less than 0" do
+    -> { @object.send(:log!, -10) }.should raise_error(Errno::EDOM)
+  end
+
+  it "raises a TypeError when passed a Complex number" do
+    -> { @object.send(:log!, Complex(4, 5)) }.should raise_error(TypeError)
+  end
+end