1 files changed, 18 insertions, 0 deletions
diff --git a/spec/ruby/library/cmath/math/acos_spec.rb b/spec/ruby/library/cmath/math/acos_spec.rb
new file mode 100644
index 0000000000..2e9104f835
--- /dev/null
+++ b/spec/ruby/library/cmath/math/acos_spec.rb
@@ -0,0 +1,18 @@
+require_relative '../../../spec_helper'
+
+ruby_version_is ''...'2.7' do
+  require 'complex'
+  require_relative 'shared/acos'
+
+  describe "Math#acos" do
+    it_behaves_like :complex_math_acos, :_, IncludesMath.new
+
+    it "is a private instance method" do
+      IncludesMath.should have_private_instance_method(:acos)
+    end
+  end
+
+  describe "Math.acos" do
+    it_behaves_like :complex_math_acos, :_, CMath
+  end
+end