1 files changed, 184 insertions, 0 deletions
diff --git a/spec/ruby/core/string/encoding_spec.rb b/spec/ruby/core/string/encoding_spec.rb
new file mode 100644
index 0000000000..f6e8fd3470
--- /dev/null
+++ b/spec/ruby/core/string/encoding_spec.rb
@@ -0,0 +1,184 @@
+# -*- encoding: us-ascii -*-
+require_relative '../../spec_helper'
+require_relative 'fixtures/iso-8859-9-encoding'
+
+describe "String#encoding" do
+  it "returns an Encoding object" do
+    String.new.encoding.should be_an_instance_of(Encoding)
+  end
+
+  it "is equal to the source encoding by default" do
+    s = StringSpecs::ISO88599Encoding.new
+    s.cedilla.encoding.should == s.source_encoding
+    s.cedilla.encode("utf-8").should == 350.chr(Encoding::UTF_8) # S-cedilla
+  end
+
+  it "returns the given encoding if #force_encoding has been called" do
+    "a".dup.force_encoding(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+  end
+
+  it "returns the given encoding if #encode!has been called" do
+    "a".dup.encode!(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+  end
+end
+
+describe "String#encoding for US-ASCII Strings" do
+  it "returns US-ASCII if self is US-ASCII" do
+    "a".encoding.should == Encoding::US_ASCII
+  end
+
+  it "returns US-ASCII if self is US-ASCII only, despite the default internal encoding being different" do
+    default_internal = Encoding.default_internal
+    Encoding.default_internal = Encoding::UTF_8
+    "a".encoding.should == Encoding::US_ASCII
+    Encoding.default_internal = default_internal
+  end
+
+  it "returns US-ASCII if self is US-ASCII only, despite the default external encoding being different" do
+    default_external = Encoding.default_external
+    Encoding.default_external = Encoding::UTF_8
+    "a".encoding.should == Encoding::US_ASCII
+    Encoding.default_external = default_external
+  end
+
+  it "returns US-ASCII if self is US-ASCII only, despite the default internal and external encodings being different" do
+    default_internal = Encoding.default_internal
+    default_external = Encoding.default_external
+    Encoding.default_internal = Encoding::UTF_8
+    Encoding.default_external = Encoding::UTF_8
+    "a".encoding.should == Encoding::US_ASCII
+    Encoding.default_external = default_external
+    Encoding.default_internal = default_internal
+  end
+
+  it "returns US-ASCII if self is US-ASCII only, despite the default encodings being different" do
+    default_internal = Encoding.default_internal
+    default_external = Encoding.default_external
+    Encoding.default_internal = Encoding::UTF_8
+    Encoding.default_external = Encoding::UTF_8
+    "a".encoding.should == Encoding::US_ASCII
+    Encoding.default_external = default_external
+    Encoding.default_internal = default_internal
+  end
+
+end
+
+describe "String#encoding for Strings with \\u escapes" do
+  it "returns UTF-8" do
+    "\u{4040}".encoding.should == Encoding::UTF_8
+  end
+
+  it "returns US-ASCII if self is US-ASCII only" do
+    s = "\u{40}"
+    s.ascii_only?.should be_true
+    s.encoding.should == Encoding::US_ASCII
+  end
+
+  it "returns UTF-8 if self isn't US-ASCII only" do
+    s = "\u{4076}\u{619}"
+    s.ascii_only?.should be_false
+    s.encoding.should == Encoding::UTF_8
+  end
+
+  it "is not affected by the default internal encoding" do
+    default_internal = Encoding.default_internal
+    Encoding.default_internal = Encoding::ISO_8859_15
+    "\u{5050}".encoding.should == Encoding::UTF_8
+    "\u{50}".encoding.should == Encoding::US_ASCII
+    Encoding.default_internal = default_internal
+  end
+
+  it "is not affected by the default external encoding" do
+    default_external = Encoding.default_external
+    Encoding.default_external = Encoding::SHIFT_JIS
+    "\u{50}".encoding.should == Encoding::US_ASCII
+    "\u{5050}".encoding.should == Encoding::UTF_8
+    Encoding.default_external = default_external
+  end
+
+  it "is not affected by both the default internal and external encoding being set at the same time" do
+    default_internal = Encoding.default_internal
+    default_external = Encoding.default_external
+    Encoding.default_internal = Encoding::EUC_JP
+    Encoding.default_external = Encoding::SHIFT_JIS
+    "\u{50}".encoding.should == Encoding::US_ASCII
+    "\u{507}".encoding.should == Encoding::UTF_8
+    Encoding.default_external = default_external
+    Encoding.default_internal = default_internal
+  end
+
+  it "returns the given encoding if #force_encoding has been called" do
+    "\u{20}".dup.force_encoding(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+    "\u{2020}".dup.force_encoding(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+  end
+
+  it "returns the given encoding if #encode!has been called" do
+    "\u{20}".dup.encode!(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+    "\u{2020}".dup.encode!(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+  end
+end
+
+describe "String#encoding for Strings with \\x escapes" do
+
+  it "returns US-ASCII if self is US-ASCII only" do
+    s = "\x61"
+    s.ascii_only?.should be_true
+    s.encoding.should == Encoding::US_ASCII
+  end
+
+  it "returns BINARY when an escape creates a byte with the 8th bit set if the source encoding is US-ASCII" do
+    __ENCODING__.should == Encoding::US_ASCII
+    str = " "
+    str.encoding.should == Encoding::US_ASCII
+    str += [0xDF].pack('C')
+    str.ascii_only?.should be_false
+    str.encoding.should == Encoding::BINARY
+  end
+
+  # TODO: Deal with case when the byte in question isn't valid in the source
+  # encoding?
+  it "returns the source encoding when an escape creates a byte with the 8th bit set if the source encoding isn't US-ASCII" do
+    fixture  = StringSpecs::ISO88599Encoding.new
+    fixture.source_encoding.should == Encoding::ISO8859_9
+    fixture.x_escape.ascii_only?.should be_false
+    fixture.x_escape.encoding.should == Encoding::ISO8859_9
+  end
+
+  it "is not affected by the default internal encoding" do
+    default_internal = Encoding.default_internal
+    Encoding.default_internal = Encoding::ISO_8859_15
+    "\x50".encoding.should == Encoding::US_ASCII
+    "\x50".encoding.should == Encoding::US_ASCII
+    Encoding.default_internal = default_internal
+  end
+
+  it "is not affected by the default external encoding" do
+    default_external = Encoding.default_external
+    Encoding.default_external = Encoding::SHIFT_JIS
+    "\x50".encoding.should == Encoding::US_ASCII
+    [0xD4].pack('C').encoding.should == Encoding::BINARY
+    Encoding.default_external = default_external
+  end
+
+  it "is not affected by both the default internal and external encoding being set at the same time" do
+    default_internal = Encoding.default_internal
+    default_external = Encoding.default_external
+    Encoding.default_internal = Encoding::EUC_JP
+    Encoding.default_external = Encoding::SHIFT_JIS
+    x50 = "\x50"
+    x50.encoding.should == Encoding::US_ASCII
+    [0xD4].pack('C').encoding.should == Encoding::BINARY
+    Encoding.default_external = default_external
+    Encoding.default_internal = default_internal
+  end
+
+  it "returns the given encoding if #force_encoding has been called" do
+    "\x50".dup.force_encoding(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+    [212].pack('C').force_encoding(Encoding::ISO_8859_9).encoding.should == Encoding::ISO_8859_9
+  end
+
+  it "returns the given encoding if #encode!has been called" do
+    "\x50".dup.encode!(Encoding::SHIFT_JIS).encoding.should == Encoding::SHIFT_JIS
+    "x\00".dup.encode!(Encoding::UTF_8).encoding.should == Encoding::UTF_8
+  end
+end