1 files changed, 28 insertions, 0 deletions
diff --git a/spec/ruby/library/stringscanner/named_captures_spec.rb b/spec/ruby/library/stringscanner/named_captures_spec.rb
new file mode 100644
index 0000000000..927784a6c4
--- /dev/null
+++ b/spec/ruby/library/stringscanner/named_captures_spec.rb
@@ -0,0 +1,28 @@
+require_relative '../../spec_helper'
+require 'strscan'
+
+describe "StringScanner#named_captures" do
+  before do
+    @s = StringScanner.new('Fri Dec 12 1975 14:39')
+  end
+
+  it "returns a hash of names and matched substrings for named capturing groups in a regular expression of the most recent matching" do
+    @s.exist?(/(?<wday>\w+) (?<month>\w+) (?<day>\d+)/)
+    @s.named_captures.should == {"wday" => "Fri", "month" => "Dec", "day" => "12"}
+  end
+
+  it "returns {} if there are no named capturing groups" do
+    @s.exist?(/(\w+) (\w+) (\d+)/)
+    @s.named_captures.should == {}
+  end
+
+  # https://github.com/ruby/strscan/issues/132 fixed in strscan v3.0.7
+  it "returns {} if there is no any matching done" do
+    @s.named_captures.should == {}
+  end
+
+  it "returns nil for an optional named capturing group if it doesn't match" do
+    @s.exist?(/(?<wday>\w+) (?<month>\w+) (?<day>\s+)?/)
+    @s.named_captures.should == {"wday" => "Fri", "month" => "Dec", "day" => nil}
+  end
+end