1 files changed, 37 insertions, 0 deletions
diff --git a/spec/ruby/core/math/cosh_spec.rb b/spec/ruby/core/math/cosh_spec.rb
new file mode 100644
index 0000000000..561c3cd312
--- /dev/null
+++ b/spec/ruby/core/math/cosh_spec.rb
@@ -0,0 +1,37 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Math.cosh" do
+  it "returns a float" do
+    Math.cosh(1.0).should be_kind_of(Float)
+  end
+
+  it "returns the hyperbolic cosine of the argument" do
+    Math.cosh(0.0).should == 1.0
+    Math.cosh(-0.0).should == 1.0
+    Math.cosh(1.5).should be_close(2.35240961524325, TOLERANCE)
+    Math.cosh(-2.99).should be_close(9.96798496414416, TOLERANCE)
+  end
+
+  it "raises a TypeError if the argument cannot be coerced with Float()" do
+    lambda { Math.cosh("test") }.should raise_error(TypeError)
+  end
+
+  it "returns NaN given NaN" do
+    Math.cosh(nan_value).nan?.should be_true
+  end
+
+  it "raises a TypeError if the argument is nil" do
+    lambda { Math.cosh(nil) }.should raise_error(TypeError)
+  end
+
+  it "accepts any argument that can be coerced with Float()" do
+    Math.cosh(MathSpecs::Float.new).should be_close(1.54308063481524, TOLERANCE)
+  end
+end
+
+describe "Math#cosh" do
+  it "is accessible as a private instance method" do
+    IncludesMath.new.send(:cos, 3.1415).should be_close(-0.999999995707656, TOLERANCE)
+  end
+end