1 files changed, 88 insertions, 0 deletions
diff --git a/spec/ruby/core/string/oct_spec.rb b/spec/ruby/core/string/oct_spec.rb
new file mode 100644
index 0000000000..7cdbabc436
--- /dev/null
+++ b/spec/ruby/core/string/oct_spec.rb
@@ -0,0 +1,88 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+# Note: We can't completely spec this in terms of to_int() because hex()
+# allows the base to be changed by a base specifier in the string.
+# See http://groups.google.com/group/ruby-core-google/browse_frm/thread/b53e9c2003425703
+describe "String#oct" do
+  it "treats numeric digits as base-8 digits by default" do
+    "0".oct.should == 0
+    "77".oct.should == 077
+    "077".oct.should == 077
+  end
+
+  it "accepts numbers formatted as binary" do
+    "0b1010".oct.should == 0b1010
+  end
+
+  it "accepts numbers formatted as hexadecimal" do
+    "0xFF".oct.should == 0xFF
+  end
+
+  it "accepts numbers formatted as decimal" do
+    "0d500".oct.should == 500
+  end
+
+  describe "with a leading minus sign" do
+    it "treats numeric digits as base-8 digits by default" do
+      "-12348".oct.should == -01234
+    end
+
+    it "accepts numbers formatted as binary" do
+      "-0b0101".oct.should == -0b0101
+    end
+
+    it "accepts numbers formatted as hexadecimal" do
+      "-0xEE".oct.should == -0xEE
+    end
+
+    it "accepts numbers formatted as decimal" do
+      "-0d500".oct.should == -500
+    end
+  end
+
+  describe "with a leading plus sign" do
+    it "treats numeric digits as base-8 digits by default" do
+      "+12348".oct.should == 01234
+    end
+
+    it "accepts numbers formatted as binary" do
+      "+0b1010".oct.should == 0b1010
+    end
+
+    it "accepts numbers formatted as hexadecimal" do
+      "+0xFF".oct.should == 0xFF
+    end
+
+    it "accepts numbers formatted as decimal" do
+      "+0d500".oct.should == 500
+    end
+  end
+
+  it "accepts a single underscore separating digits" do
+    "755_333".oct.should == 0755_333
+  end
+
+  it "does not accept a sequence of underscores as part of a number" do
+    "7__3".oct.should == 07
+    "7___3".oct.should == 07
+    "7__5".oct.should == 07
+  end
+
+  it "ignores characters that are incorrect for the base-8 digits" do
+    "0o".oct.should == 0
+    "5678".oct.should == 0567
+  end
+
+  it "returns 0 if no characters can be interpreted as a base-8 number" do
+    "".oct.should == 0
+    "+-5".oct.should == 0
+    "wombat".oct.should == 0
+  end
+
+  it "returns 0 for strings with leading underscores" do
+    "_7".oct.should == 0
+    "_07".oct.should == 0
+    " _7".oct.should == 0
+  end
+end