1 files changed, 37 insertions, 0 deletions
diff --git a/spec/ruby/core/string/unpack/w_spec.rb b/spec/ruby/core/string/unpack/w_spec.rb
new file mode 100644
index 0000000000..cc9aecac9c
--- /dev/null
+++ b/spec/ruby/core/string/unpack/w_spec.rb
@@ -0,0 +1,37 @@
+# encoding: binary
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+
+describe "String#unpack with directive 'w'" do
+  it_behaves_like :string_unpack_basic, 'w'
+  it_behaves_like :string_unpack_no_platform, 'w'
+
+  it "decodes a BER-compressed integer" do
+    [ ["\x00", [0]],
+      ["\x01", [1]],
+      ["\xce\x0f", [9999]],
+      ["\x84\x80\x80\x80\x80\x80\x80\x80\x80\x00", [2**65]]
+    ].should be_computed_by(:unpack, "w")
+  end
+
+  it "raise ArgumentError for NULL bytes between directives" do
+    -> {
+      "\x01\x02\x03".unpack("w\x00w")
+    }.should.raise(ArgumentError, /unknown unpack directive/)
+  end
+
+  it "ignores spaces between directives" do
+    "\x01\x02\x03".unpack("w w").should == [1, 2]
+  end
+end
+
+describe "String#unpack with directive 'w*'" do
+
+  it "decodes BER-compressed integers" do
+    "\x01\x02\x03\x04".unpack("w*").should == [1, 2, 3, 4]
+    "\x00\xCE\x0F\x84\x80\x80\x80\x80\x80\x80\x80\x80\x00\x01\x00".unpack("w*").should == [0, 9999, 2**65, 1, 0]
+    "\x81\x80\x80\x80\x80\x80\x80\x80\x80\x00\x90\x80\x80\x80\x80\x80\x80\x80\x03\x01\x02".unpack("w*").should == [2**63, (2**60 + 3), 1, 2]
+  end
+
+end