1 files changed, 60 insertions, 0 deletions
diff --git a/spec/rubyspec/core/string/unpack/shared/unicode.rb b/spec/rubyspec/core/string/unpack/shared/unicode.rb
new file mode 100644
index 0000000000..a2b4e142b2
--- /dev/null
+++ b/spec/rubyspec/core/string/unpack/shared/unicode.rb
@@ -0,0 +1,60 @@
+# -*- encoding: utf-8 -*-
+
+describe :string_unpack_unicode, shared: true do
+  it "decodes Unicode codepoints as ASCII values" do
+    [ ["\x00",      [0]],
+      ["\x01",      [1]],
+      ["\x08",      [8]],
+      ["\x0f",      [15]],
+      ["\x18",      [24]],
+      ["\x1f",      [31]],
+      ["\x7f",      [127]],
+      ["\xc2\x80",  [128]],
+      ["\xc2\x81",  [129]],
+      ["\xc3\xbf",  [255]]
+    ].should be_computed_by(:unpack, "U")
+  end
+
+  it "decodes the number of characters specified by the count modifier" do
+    [ ["\xc2\x80\xc2\x81\xc2\x82\xc2\x83", "U1", [0x80]],
+      ["\xc2\x80\xc2\x81\xc2\x82\xc2\x83", "U2", [0x80, 0x81]],
+      ["\xc2\x80\xc2\x81\xc2\x82\xc2\x83", "U3", [0x80, 0x81, 0x82]]
+    ].should be_computed_by(:unpack)
+  end
+
+  it "implicitly has a count of one when no count modifier is passed" do
+    "\xc2\x80\xc2\x81\xc2\x82\xc2\x83".unpack("U1").should == [0x80]
+  end
+
+  it "decodes all remaining characters when passed the '*' modifier" do
+    "\xc2\x80\xc2\x81\xc2\x82\xc2\x83".unpack("U*").should == [0x80, 0x81, 0x82, 0x83]
+  end
+
+  it "decodes UTF-8 BMP codepoints" do
+    [ ["\xc2\x80",      [0x80]],
+      ["\xdf\xbf",      [0x7ff]],
+      ["\xe0\xa0\x80",  [0x800]],
+      ["\xef\xbf\xbf",  [0xffff]]
+    ].should be_computed_by(:unpack, "U")
+  end
+
+  it "decodes UTF-8 max codepoints" do
+    [ ["\xf0\x90\x80\x80", [0x10000]],
+      ["\xf3\xbf\xbf\xbf", [0xfffff]],
+      ["\xf4\x80\x80\x80", [0x100000]],
+      ["\xf4\x8f\xbf\xbf", [0x10ffff]]
+    ].should be_computed_by(:unpack, "U")
+  end
+
+  it "does not decode any items for directives exceeding the input string size" do
+    "\xc2\x80".unpack("UUUU").should == [0x80]
+  end
+
+  it "ignores NULL bytes between directives" do
+    "\x01\x02".unpack("U\x00U").should == [1, 2]
+  end
+
+  it "ignores spaces between directives" do
+    "\x01\x02".unpack("U U").should == [1, 2]
+  end
+end