1 files changed, 124 insertions, 0 deletions
diff --git a/spec/ruby/optional/capi/fixnum_spec.rb b/spec/ruby/optional/capi/fixnum_spec.rb
new file mode 100644
index 0000000000..d9e9d1946d
--- /dev/null
+++ b/spec/ruby/optional/capi/fixnum_spec.rb
@@ -0,0 +1,124 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+load_extension("fixnum")
+
+describe "CApiFixnumSpecs" do
+  before :each do
+    @s = CApiFixnumSpecs.new
+  end
+
+  describe "FIX2INT" do
+    it "converts a Fixnum to a native int" do
+      @s.FIX2INT(42).should == 42
+      @s.FIX2INT(-14).should == -14
+    end
+
+    max_int = (1 << 31) - 1
+    min_int = -(1 << 31)
+
+    guard -> { fixnum_min <= min_int and max_int <= fixnum_max } do
+      it "converts a Fixnum representing the minimum and maximum native int" do
+        @s.FIX2INT(max_int).should == max_int
+        @s.FIX2INT(min_int).should == min_int
+      end
+    end
+
+  end
+
+  describe "FIX2UINT" do
+    it "converts a Fixnum to a native int" do
+      @s.FIX2UINT(42).should == 42
+      @s.FIX2UINT(0).should == 0
+    end
+
+    max_uint = (1 << 32) - 1
+
+    guard -> { max_uint <= fixnum_max } do
+      it "converts a Fixnum representing the maximum native uint" do
+        @s.FIX2UINT(max_uint).should == max_uint
+      end
+    end
+
+  end
+
+  platform_is wordsize: 64 do
+    describe "rb_fix2uint" do
+      it "raises a TypeError if passed nil" do
+        lambda { @s.rb_fix2uint(nil) }.should raise_error(TypeError)
+      end
+
+      it "converts a Fixnum" do
+        @s.rb_fix2uint(0).should == 0
+        @s.rb_fix2uint(1).should == 1
+      end
+
+      it "converts the maximum uint value" do
+        @s.rb_fix2uint(0xffff_ffff).should == 0xffff_ffff
+      end
+
+      it "converts a Float" do
+        @s.rb_fix2uint(25.4567).should == 25
+      end
+
+      it "raises a RangeError if the value does not fit a native uint" do
+        # Interestingly, on MRI rb_fix2uint(-1) is allowed
+        lambda { @s.rb_fix2uint(0xffff_ffff+1) }.should raise_error(RangeError)
+        lambda { @s.rb_fix2uint(-(1 << 31) - 1) }.should raise_error(RangeError)
+      end
+
+      it "raises a RangeError if the value is more than 32bits" do
+        lambda { @s.rb_fix2uint(0xffff_ffff+1) }.should raise_error(RangeError)
+      end
+
+      it "raises a RangeError if the value is more than 64bits" do
+        lambda { @s.rb_fix2uint(0xffff_ffff_ffff_ffff+1) }.should raise_error(RangeError)
+      end
+    end
+
+    describe "rb_fix2int" do
+      it "raises a TypeError if passed nil" do
+        lambda { @s.rb_fix2int(nil) }.should raise_error(TypeError)
+      end
+
+      it "converts a Fixnum" do
+        @s.rb_fix2int(-1).should == -1
+        @s.rb_fix2int(1).should == 1
+      end
+
+      it "converts the minimum int value" do
+        @s.rb_fix2int(-(1 << 31)).should == -(1 << 31)
+      end
+
+      it "converts the maximum int value" do
+        @s.rb_fix2int(0x7fff_ffff).should == 0x7fff_ffff
+      end
+
+      it "converts a Float" do
+        @s.rb_fix2int(25.4567).should == 25
+      end
+
+      it "converts a negative Bignum into an signed number" do
+        @s.rb_fix2int(-2147442171).should == -2147442171
+      end
+
+      it "raises a RangeError if the value does not fit a native int" do
+        lambda { @s.rb_fix2int(0x7fff_ffff+1) }.should raise_error(RangeError)
+        lambda { @s.rb_fix2int(-(1 << 31) - 1) }.should raise_error(RangeError)
+      end
+
+      it "raises a RangeError if the value is more than 32bits" do
+        lambda { @s.rb_fix2int(0xffff_ffff+1) }.should raise_error(RangeError)
+      end
+
+      it "raises a RangeError if the value is more than 64bits" do
+        lambda { @s.rb_fix2int(0xffff_ffff_ffff_ffff+1) }.should raise_error(RangeError)
+      end
+
+      it "calls #to_int to coerce the value" do
+        obj = mock("number")
+        obj.should_receive(:to_int).and_return(2)
+        @s.rb_fix2int(obj).should == 2
+      end
+    end
+  end
+end