1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/library/stringscanner/captures_spec.rb b/spec/ruby/library/stringscanner/captures_spec.rb
new file mode 100644
index 0000000000..bdfb0e0cc5
--- /dev/null
+++ b/spec/ruby/library/stringscanner/captures_spec.rb
@@ -0,0 +1,36 @@
+require_relative '../../spec_helper'
+require 'strscan'
+
+describe "StringScanner#captures" do
+  before do
+    @s = StringScanner.new('Fri Dec 12 1975 14:39')
+  end
+
+  it "returns the array of captured values of the most recent matching" do
+    @s.exist?(/(?<wday>\w+) (?<month>\w+) (?<day>\d+)/)
+    @s.captures.should == ["Fri", "Dec", "12"]
+  end
+
+  it "returns nil if the last match fails" do
+    @s.scan(/nope/)
+    @s.captures.should == nil
+  end
+
+  it "returns nil if there is no any match done" do
+    @s.captures.should == nil
+  end
+
+  version_is StringScanner::Version, ""..."3.0.8" do # ruby_version_is ""..."3.3.3"
+    it "returns '' for an optional capturing group if it doesn't match" do
+      @s.exist?(/(?<wday>\w+) (?<month>\w+) (?<day>\s+)?/)
+      @s.captures.should == ["Fri", "Dec", ""]
+    end
+  end
+
+  version_is StringScanner::Version, "3.0.8" do # ruby_version_is "3.3.3"
+    it "returns nil for an optional capturing group if it doesn't match" do
+      @s.exist?(/(?<wday>\w+) (?<month>\w+) (?<day>\s+)?/)
+      @s.captures.should == ["Fri", "Dec", nil]
+    end
+  end
+end