1 files changed, 29 insertions, 1 deletions
diff --git a/spec/ruby/core/matchdata/begin_spec.rb b/spec/ruby/core/matchdata/begin_spec.rb
index 85c454da56..b4be077ae4 100644
--- a/spec/ruby/core/matchdata/begin_spec.rb
+++ b/spec/ruby/core/matchdata/begin_spec.rb
@@ -12,7 +12,7 @@ describe "MatchData#begin" do
 
     it "returns nil when the nth match isn't found" do
       match_data = /something is( not)? (right)/.match("something is right")
-      match_data.begin(1).should be_nil
+      match_data.begin(1).should == nil
     end
 
     it "returns the character offset for multi-byte strings" do
@@ -36,6 +36,18 @@ describe "MatchData#begin" do
       match_data = /(.)(.)(\d+)(\d)/.match("THX1138.")
       match_data.begin(obj).should == 2
     end
+
+    it "raises IndexError if index is out of bounds" do
+      match_data = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      -> {
+        match_data.begin(-1)
+      }.should.raise(IndexError, "index -1 out of matches")
+
+      -> {
+        match_data.begin(3)
+      }.should.raise(IndexError, "index 3 out of matches")
+    end
   end
 
   context "when passed a String argument" do
@@ -68,6 +80,14 @@ describe "MatchData#begin" do
       match_data = /(?<æ>.)(.)(?<b>\d+)(\d)/.match("THX1138.")
       match_data.begin("æ").should == 1
     end
+
+    it "raises IndexError if there is no group with the provided name" do
+      match_data = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      -> {
+        match_data.begin("y")
+      }.should.raise(IndexError, "undefined group name reference: y")
+    end
   end
 
   context "when passed a Symbol argument" do
@@ -100,5 +120,13 @@ describe "MatchData#begin" do
       match_data = /(?<æ>.)(.)(?<b>\d+)(\d)/.match("THX1138.")
       match_data.begin(:æ).should == 1
     end
+
+    it "raises IndexError if there is no group with the provided name" do
+      match_data = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      -> {
+        match_data.begin(:y)
+      }.should.raise(IndexError, "undefined group name reference: y")
+    end
   end
 end