Add tests with unknown directives for Array#pack, String#unpack

Author: trinistr

core/array/pack/unknown_spec.rb

@@ -0,0 +1,15 @@
+require_relative '../../../spec_helper'
+
+describe "Array#pack with unknown directive" do
+  ruby_version_is ""..."3.3" do
+    it "ignores unknown directive with a warning" do
+      -> { [1, 2, 3].pack("nkv").should == "\x00\x01\x02\x00".b }.should complain(/unknown pack directive 'k' in 'nkv'/)
+    end
+  end
+
+  ruby_version_is "3.3" do
+    it "raises ArgumentError" do
+      -> { [1, 2, 3].pack("nkv") }.should raise_error(ArgumentError, "unknown pack directive 'k' in 'nkv'")
+    end
+  end
+end

core/string/unpack_spec.rb

@@ -29,4 +29,16 @@
   it "raises an ArgumentError when the offset is larger than the string" do
     -> { "a".unpack("C", offset: 2) }.should raise_error(ArgumentError, "offset outside of string")
   end
+
+  ruby_version_is ""..."3.3" do
+    it "ignores unknown directive with a warning" do
+      -> { "\x00\x01\x02\x00".b.unpack("nkv").should == [1, 2] }.should complain(/unknown unpack directive 'k' in 'nkv'/)
+    end
+  end
+
+  ruby_version_is "3.3" do
+    it "raises an ArgumentError if a directive is unknown" do
+      -> { "\x00\x01\x02\x00".b.unpack("nkv") }.should raise_error(ArgumentError, "unknown unpack directive 'k' in 'nkv'")
+    end
+  end
 end