1 files changed, 79 insertions, 2 deletions
diff --git a/spec/ruby/library/stringscanner/get_byte_spec.rb b/spec/ruby/library/stringscanner/get_byte_spec.rb
index 29e2f557de..b989b73883 100644
--- a/spec/ruby/library/stringscanner/get_byte_spec.rb
+++ b/spec/ruby/library/stringscanner/get_byte_spec.rb
@@ -1,7 +1,84 @@
+# encoding: binary
 require_relative '../../spec_helper'
-require_relative 'shared/get_byte'
 require 'strscan'
 
 describe "StringScanner#get_byte" do
-  it_behaves_like :strscan_get_byte, :get_byte
+  it "scans one byte and returns it" do
+    s = StringScanner.new('abc5.')
+    s.get_byte.should == 'a'
+    s.get_byte.should == 'b'
+    s.get_byte.should == 'c'
+    s.get_byte.should == '5'
+    s.get_byte.should == '.'
+  end
+
+  it "is not multi-byte character sensitive" do
+    s = StringScanner.new("\244\242")
+    s.get_byte.should == "\244"
+    s.get_byte.should == "\242"
+  end
+
+  it "returns nil at the end of the string" do
+    # empty string case
+    s = StringScanner.new('')
+    s.get_byte.should == nil
+    s.get_byte.should == nil
+
+    # non-empty string case
+    s = StringScanner.new('a')
+    s.get_byte # skip one
+    s.get_byte.should == nil
+  end
+
+  describe "#[] successive call with a capture group name" do
+    # https://github.com/ruby/strscan/issues/139
+    version_is StringScanner::Version, "3.1.1"..."3.1.3" do # ruby_version_is "3.4.0"..."3.4.3"
+      it "returns nil" do
+        s = StringScanner.new("This is a test")
+        s.get_byte
+        s.should.matched?
+        s[:a].should == nil
+      end
+    end
+    version_is StringScanner::Version, "3.1.3" do # ruby_version_is "3.4.3"
+      it "raises IndexError" do
+        s = StringScanner.new("This is a test")
+        s.get_byte
+        s.should.matched?
+        -> { s[:a] }.should.raise(IndexError)
+      end
+    end
+
+    it "returns a matching character when given Integer index" do
+      s = StringScanner.new("This is a test")
+      s.get_byte
+      s[0].should == "T"
+    end
+
+    # https://github.com/ruby/strscan/issues/135
+    version_is StringScanner::Version, "3.1.1"..."3.1.3" do # ruby_version_is "3.4.0"..."3.4.3"
+      it "ignores the previous matching with Regexp" do
+        s = StringScanner.new("This is a test")
+        s.exist?(/(?<a>This)/)
+        s.should.matched?
+        s[:a].should == "This"
+
+        s.get_byte
+        s.should.matched?
+        s[:a].should == nil
+      end
+    end
+    version_is StringScanner::Version, "3.1.3" do # ruby_version_is "3.4.3"
+      it "ignores the previous matching with Regexp" do
+        s = StringScanner.new("This is a test")
+        s.exist?(/(?<a>This)/)
+        s.should.matched?
+        s[:a].should == "This"
+
+        s.get_byte
+        s.should.matched?
+        -> { s[:a] }.should.raise(IndexError)
+      end
+    end
+  end
 end