1 files changed, 51 insertions, 0 deletions
diff --git a/spec/ruby/core/string/unpack/shared/string.rb b/spec/ruby/core/string/unpack/shared/string.rb
new file mode 100644
index 0000000000..9d85eedf26
--- /dev/null
+++ b/spec/ruby/core/string/unpack/shared/string.rb
@@ -0,0 +1,51 @@
+describe :string_unpack_string, shared: true do
+  it "returns an empty string if the input is empty" do
+    "".unpack(unpack_format).should == [""]
+  end
+
+  it "returns empty strings for repeated formats if the input is empty" do
+    "".unpack(unpack_format(nil, 3)).should == ["", "", ""]
+  end
+
+  it "returns an empty string and does not decode any bytes when the count modifier is zero" do
+    "abc".unpack(unpack_format(0)+unpack_format).should == ["", "a"]
+  end
+
+  it "implicitly has a count of one when no count is specified" do
+    "abc".unpack(unpack_format).should == ["a"]
+  end
+
+  it "decodes the number of bytes specified by the count modifier" do
+    "abc".unpack(unpack_format(3)).should == ["abc"]
+  end
+
+  it "decodes the number of bytes specified by the count modifier including whitespace bytes" do
+    [ ["a bc",  ["a b", "c"]],
+      ["a\fbc", ["a\fb", "c"]],
+      ["a\nbc", ["a\nb", "c"]],
+      ["a\rbc", ["a\rb", "c"]],
+      ["a\tbc", ["a\tb", "c"]],
+      ["a\vbc", ["a\vb", "c"]]
+    ].should be_computed_by(:unpack, unpack_format(3)+unpack_format)
+  end
+
+  it "decodes past whitespace bytes when passed the '*' modifier" do
+    [ ["a b c",    ["a b c"]],
+      ["a\fb c",   ["a\fb c"]],
+      ["a\nb c",   ["a\nb c"]],
+      ["a\rb c",   ["a\rb c"]],
+      ["a\tb c",   ["a\tb c"]],
+      ["a\vb c",   ["a\vb c"]],
+    ].should be_computed_by(:unpack, unpack_format("*"))
+  end
+end
+
+describe :string_unpack_Aa, shared: true do
+  it "decodes the number of bytes specified by the count modifier including NULL bytes" do
+    "a\x00bc".unpack(unpack_format(3)+unpack_format).should == ["a\x00b", "c"]
+  end
+
+  it "decodes past NULL bytes when passed the '*' modifier" do
+    "a\x00b c".unpack(unpack_format("*")).should == ["a\x00b c"]
+  end
+end