Add bin and edit workflow

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

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+require 'facets/math/sign'
+
+test_case Math do
+
+  class_method :sign do
+    test do
+      Math.sign(-3.1).assert == -1.0
+      Math.sign( 0.0).assert ==  0.0
+      Math.sign( 3.1).assert ==  1.0
+    end
+
+    # Check complementarity of abs and sign
+    #assert_equal_float(-2.0, Math.abs(-2.0) * Math.sign(-2.0), 1e-6)
+    #assert_equal_float( 0.0, Math.abs( 0.0) * Math.sign( 0.0), 1e-6)
+    #assert_equal_float( 3.0, Math.abs( 3.0) * Math.sign( 3.0), 1e-6)
+
+  end
+
+end
+