1 files changed, 14 insertions, 6 deletions
diff --git a/spec/ruby/core/string/unpack/shared/basic.rb b/spec/ruby/core/string/unpack/shared/basic.rb
index 0ecbf615af..734630bda0 100644
--- a/spec/ruby/core/string/unpack/shared/basic.rb
+++ b/spec/ruby/core/string/unpack/shared/basic.rb
@@ -9,21 +9,29 @@ describe :string_unpack_basic, shared: true do
     "abc".unpack(d).should be_an_instance_of(Array)
   end
 
-  it "raises a TypeError when passed nil" do
-    lambda { "abc".unpack(nil) }.should raise_error(TypeError)
+  ruby_version_is ""..."3.3" do
+    it "warns about using an unknown directive" do
+      -> { "abcdefgh".unpack("a R" + unpack_format) }.should complain(/unknown unpack directive 'R' in 'a R#{unpack_format}'/)
+      -> { "abcdefgh".unpack("a 0" + unpack_format) }.should complain(/unknown unpack directive '0' in 'a 0#{unpack_format}'/)
+      -> { "abcdefgh".unpack("a :" + unpack_format) }.should complain(/unknown unpack directive ':' in 'a :#{unpack_format}'/)
+    end
   end
 
-  it "raises a TypeError when passed an Integer" do
-    lambda { "abc".unpack(1) }.should raise_error(TypeError)
+  ruby_version_is "3.3" do
+    it "raises ArgumentError when a directive is unknown" do
+      -> { "abcdefgh".unpack("a K" + unpack_format) }.should raise_error(ArgumentError, "unknown unpack directive 'K' in 'a K#{unpack_format}'")
+      -> { "abcdefgh".unpack("a 0" + unpack_format) }.should raise_error(ArgumentError, "unknown unpack directive '0' in 'a 0#{unpack_format}'")
+      -> { "abcdefgh".unpack("a :" + unpack_format) }.should raise_error(ArgumentError, "unknown unpack directive ':' in 'a :#{unpack_format}'")
+    end
   end
 end
 
 describe :string_unpack_no_platform, shared: true do
   it "raises an ArgumentError when the format modifier is '_'" do
-    lambda { "abcdefgh".unpack(unpack_format("_")) }.should raise_error(ArgumentError)
+    -> { "abcdefgh".unpack(unpack_format("_")) }.should raise_error(ArgumentError)
   end
 
   it "raises an ArgumentError when the format modifier is '!'" do
-    lambda { "abcdefgh".unpack(unpack_format("!")) }.should raise_error(ArgumentError)
+    -> { "abcdefgh".unpack(unpack_format("!")) }.should raise_error(ArgumentError)
   end
 end