1 files changed, 140 insertions, 0 deletions
diff --git a/spec/rubyspec/core/io/internal_encoding_spec.rb b/spec/rubyspec/core/io/internal_encoding_spec.rb
new file mode 100644
index 0000000000..7578559838
--- /dev/null
+++ b/spec/rubyspec/core/io/internal_encoding_spec.rb
@@ -0,0 +1,140 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+with_feature :encoding do
+  describe :io_internal_encoding, shared: true do
+    describe "when Encoding.default_internal is not set" do
+      before :each do
+        Encoding.default_internal = nil
+      end
+
+      it "returns nil if the internal encoding is not set" do
+        @io = new_io @name, @object
+        @io.internal_encoding.should be_nil
+      end
+
+      it "returns nil if Encoding.default_internal is changed after the instance is created" do
+        @io = new_io @name, @object
+        Encoding.default_internal = Encoding::IBM437
+        @io.internal_encoding.should be_nil
+      end
+
+      it "returns the value set when the instance was created" do
+        @io = new_io @name, "#{@object}:utf-8:euc-jp"
+        Encoding.default_internal = Encoding::IBM437
+        @io.internal_encoding.should equal(Encoding::EUC_JP)
+      end
+
+      it "returns the value set by #set_encoding" do
+        @io = new_io @name, @object
+        @io.set_encoding(Encoding::US_ASCII, Encoding::IBM437)
+        @io.internal_encoding.should equal(Encoding::IBM437)
+      end
+    end
+
+    describe "when Encoding.default_internal == Encoding.default_external" do
+      before :each do
+        Encoding.default_external = Encoding::IBM866
+        Encoding.default_internal = Encoding::IBM866
+      end
+
+      it "returns nil" do
+        @io = new_io @name, @object
+        @io.internal_encoding.should be_nil
+      end
+
+      it "returns nil regardless of Encoding.default_internal changes" do
+        @io = new_io @name, @object
+        Encoding.default_internal = Encoding::IBM437
+        @io.internal_encoding.should be_nil
+      end
+    end
+
+    describe "when Encoding.default_internal != Encoding.default_external" do
+      before :each do
+        Encoding.default_external = Encoding::IBM437
+        Encoding.default_internal = Encoding::IBM866
+      end
+
+      it "returns the value of Encoding.default_internal when the instance was created if the internal encoding is not set" do
+        @io = new_io @name, @object
+        @io.internal_encoding.should equal(Encoding::IBM866)
+      end
+
+      it "does not change when Encoding.default_internal is changed" do
+        @io = new_io @name, @object
+        Encoding.default_internal = Encoding::IBM437
+        @io.internal_encoding.should equal(Encoding::IBM866)
+      end
+
+      it "returns the internal encoding set when the instance was created" do
+        @io = new_io @name, "#{@object}:utf-8:euc-jp"
+        @io.internal_encoding.should equal(Encoding::EUC_JP)
+      end
+
+      it "does not change when set and Encoding.default_internal is changed" do
+        @io = new_io @name, "#{@object}:utf-8:euc-jp"
+        Encoding.default_internal = Encoding::IBM437
+        @io.internal_encoding.should equal(Encoding::EUC_JP)
+      end
+
+      it "returns the value set by #set_encoding" do
+        @io = new_io @name, @object
+        @io.set_encoding(Encoding::US_ASCII, Encoding::IBM437)
+        @io.internal_encoding.should equal(Encoding::IBM437)
+      end
+
+      it "returns nil when Encoding.default_external is ASCII-8BIT and the internal encoding is not set" do
+        Encoding.default_external = Encoding::ASCII_8BIT
+        @io = new_io @name, @object
+        @io.internal_encoding.should be_nil
+      end
+
+      it "returns nil when the external encoding is ASCII-8BIT and the internal encoding is not set" do
+        @io = new_io @name, "#{@object}:ascii-8bit"
+        @io.internal_encoding.should be_nil
+      end
+    end
+  end
+
+  describe "IO#internal_encoding" do
+    before :each do
+      @external = Encoding.default_external
+      @internal = Encoding.default_internal
+
+      @name = tmp("io_internal_encoding")
+      touch(@name)
+    end
+
+    after :each do
+      @io.close if @io
+      rm_r @name
+
+      Encoding.default_external = @external
+      Encoding.default_internal = @internal
+    end
+
+    describe "with 'r' mode" do
+      it_behaves_like :io_internal_encoding, nil, "r"
+    end
+
+    describe "with 'r+' mode" do
+      it_behaves_like :io_internal_encoding, nil, "r+"
+    end
+
+    describe "with 'w' mode" do
+      it_behaves_like :io_internal_encoding, nil, "w"
+    end
+
+    describe "with 'w+' mode" do
+      it_behaves_like :io_internal_encoding, nil, "w+"
+    end
+
+    describe "with 'a' mode" do
+      it_behaves_like :io_internal_encoding, nil, "a"
+    end
+
+    describe "with 'a+' mode" do
+      it_behaves_like :io_internal_encoding, nil, "a+"
+    end
+  end
+end