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bin/gems/facets-3.1.0/test/standard/math/test_acoth.rb

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+require 'facets/math/acoth'
+require 'facets/math/coth'
+require 'facets/numeric/range'  # used to test within a precision
+
+test_case Math do
+
+  class_method :acoth do
+    test do
+      Math.acoth(1.5).range(1.0e-6).assert === 0.5 * Math.log(5.0)
+      Math.acoth(5.0).range(1.0e-6).assert === 0.5 * Math.log(1.5)
+    end
+
+    # 1.0e-6
+    test "check complementarity of acoth and coth" do
+      Math.acoth(Math.coth( 1.5)).range(1.0e-6).assert === 1.5
+      Math.coth(Math.acoth( 1.5)).range(1.0e-6).assert === 1.5
+      Math.acoth(Math.coth(-1.5)).range(1.0e-6).assert === -1.5
+      Math.coth(Math.acoth(-1.5)).range(1.0e-6).assert === -1.5
+    end
+  end
+
+end