1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/array/pack/w_spec.rb b/spec/ruby/core/array/pack/w_spec.rb
new file mode 100644
index 0000000000..e770288d67
--- /dev/null
+++ b/spec/ruby/core/array/pack/w_spec.rb
@@ -0,0 +1,54 @@
+# encoding: binary
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/numeric_basic'
+
+describe "Array#pack with format 'w'" do
+  it_behaves_like :array_pack_basic, 'w'
+  it_behaves_like :array_pack_basic_non_float, 'w'
+  it_behaves_like :array_pack_arguments, 'w'
+  it_behaves_like :array_pack_numeric_basic, 'w'
+
+  it "encodes a BER-compressed integer" do
+    [ [[0],     "\x00"],
+      [[1],     "\x01"],
+      [[9999],  "\xce\x0f"],
+      [[2**65], "\x84\x80\x80\x80\x80\x80\x80\x80\x80\x00"]
+    ].should be_computed_by(:pack, "w")
+  end
+
+  it "calls #to_int to convert the pack argument to an Integer" do
+    obj = mock('to_int')
+    obj.should_receive(:to_int).and_return(5)
+    [obj].pack("w").should == "\x05"
+  end
+
+  ruby_version_is ""..."3.3" do
+    it "ignores NULL bytes between directives" do
+      suppress_warning do
+        [1, 2, 3].pack("w\x00w").should == "\x01\x02"
+      end
+    end
+  end
+
+  ruby_version_is "3.3" do
+    it "raise ArgumentError for NULL bytes between directives" do
+      -> {
+        [1, 2, 3].pack("w\x00w")
+      }.should raise_error(ArgumentError, /unknown pack directive/)
+    end
+  end
+
+  it "ignores spaces between directives" do
+    [1, 2, 3].pack("w w").should == "\x01\x02"
+  end
+
+  it "raises an ArgumentError when passed a negative value" do
+    -> { [-1].pack("w") }.should raise_error(ArgumentError)
+  end
+
+  it "returns a binary string" do
+    [1].pack('w').encoding.should == Encoding::BINARY
+  end
+end