1 files changed, 72 insertions, 0 deletions
diff --git a/spec/mspec/lib/mspec/helpers/numeric.rb b/spec/mspec/lib/mspec/helpers/numeric.rb
new file mode 100644
index 0000000000..ff30cf2b83
--- /dev/null
+++ b/spec/mspec/lib/mspec/helpers/numeric.rb
@@ -0,0 +1,72 @@
+require 'mspec/guards/platform'
+
+class Object
+  def nan_value
+    0/0.0
+  end
+
+  def infinity_value
+    1/0.0
+  end
+
+  def bignum_value(plus=0)
+    0x8000_0000_0000_0000 + plus
+  end
+
+  # This is a bit hairy, but we need to be able to write specs that cover the
+  # boundary between Fixnum and Bignum for operations like Fixnum#<<. Since
+  # this boundary is implementation-dependent, we use these helpers to write
+  # specs based on the relationship between values rather than specific
+  # values.
+  if PlatformGuard.standard? or PlatformGuard.implementation? :topaz
+    if PlatformGuard.wordsize? 32
+      def fixnum_max
+        (2**30) - 1
+      end
+
+      def fixnum_min
+        -(2**30)
+      end
+    elsif PlatformGuard.wordsize? 64
+      def fixnum_max
+        (2**62) - 1
+      end
+
+      def fixnum_min
+        -(2**62)
+      end
+    end
+  elsif PlatformGuard.implementation? :opal
+    def fixnum_max
+      Integer::MAX
+    end
+
+    def fixnum_min
+      Integer::MIN
+    end
+  elsif PlatformGuard.implementation? :rubinius
+    def fixnum_max
+      Fixnum::MAX
+    end
+
+    def fixnum_min
+      Fixnum::MIN
+    end
+  elsif PlatformGuard.implementation?(:jruby) || PlatformGuard.implementation?(:truffleruby)
+    def fixnum_max
+      9223372036854775807
+    end
+
+    def fixnum_min
+      -9223372036854775808
+    end
+  else
+    def fixnum_max
+      raise "unknown implementation for fixnum_max() helper"
+    end
+
+    def fixnum_min
+      raise "unknown implementation for fixnum_min() helper"
+    end
+  end
+end