1 files changed, 14 insertions, 101 deletions
diff --git a/spec/ruby/core/io/buffer/shared_spec.rb b/spec/ruby/core/io/buffer/shared_spec.rb
index f2a638cf39..4f3bce5448 100644
--- a/spec/ruby/core/io/buffer/shared_spec.rb
+++ b/spec/ruby/core/io/buffer/shared_spec.rb
@@ -6,112 +6,25 @@ describe "IO::Buffer#shared?" do
     @buffer = nil
   end
 
-  context "with a buffer created with .new" do
-    it "is false for an internal buffer" do
-      @buffer = IO::Buffer.new(4, IO::Buffer::INTERNAL)
-      @buffer.shared?.should be_false
-    end
-
-    it "is false for a mapped buffer" do
-      @buffer = IO::Buffer.new(4, IO::Buffer::MAPPED)
-      @buffer.shared?.should be_false
-    end
-  end
-
-  context "with a file-backed buffer created with .map" do
-    it "is true for a regular mapping" do
-      File.open(__FILE__, "r") do |file|
-        @buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY)
-        @buffer.shared?.should be_true
-      end
-    end
-
-    ruby_version_is "3.3" do
-      it "is false for a private mapping" do
-        File.open(__FILE__, "r") do |file|
-          @buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY | IO::Buffer::PRIVATE)
-          @buffer.shared?.should be_false
-        end
-      end
-    end
+  it "is true for a buffer created with SHARED flag" do
+    @buffer = IO::Buffer.new(12, IO::Buffer::INTERNAL | IO::Buffer::SHARED)
+    @buffer.shared?.should be_true
   end
 
-  context "with a String-backed buffer created with .for" do
-    it "is false for a buffer created without a block" do
-      @buffer = IO::Buffer.for("test")
-      @buffer.shared?.should be_false
-    end
-
-    it "is false for a buffer created with a block" do
-      IO::Buffer.for(+"test") do |buffer|
-        buffer.shared?.should be_false
-      end
-    end
+  it "is true for a non-private buffer created with .map" do
+    file = File.open("#{__dir__}/../fixtures/read_text.txt", "r+")
+    @buffer = IO::Buffer.map(file)
+    file.close
+    @buffer.shared?.should be_true
   end
 
-  ruby_version_is "3.3" do
-    context "with a String-backed buffer created with .string" do
-      it "is false" do
-        IO::Buffer.string(4) do |buffer|
-          buffer.shared?.should be_false
-        end
-      end
-    end
+  it "is false for an unshared buffer" do
+    @buffer = IO::Buffer.new(12)
+    @buffer.shared?.should be_false
   end
 
-  # Always false for slices
-  context "with a slice of a buffer" do
-    context "created with .new" do
-      it "is false when slicing an internal buffer" do
-        @buffer = IO::Buffer.new(4)
-        @buffer.slice.shared?.should be_false
-      end
-
-      it "is false when slicing a mapped buffer" do
-        @buffer = IO::Buffer.new(4, IO::Buffer::MAPPED)
-        @buffer.slice.shared?.should be_false
-      end
-    end
-
-    context "created with .map" do
-      it "is false when slicing a regular file-backed buffer" do
-        File.open(__FILE__, "r") do |file|
-          @buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY)
-          @buffer.slice.shared?.should be_false
-        end
-      end
-
-      ruby_version_is "3.3" do
-        it "is false when slicing a private file-backed buffer" do
-          File.open(__FILE__, "r") do |file|
-            @buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY | IO::Buffer::PRIVATE)
-            @buffer.slice.shared?.should be_false
-          end
-        end
-      end
-    end
-
-    context "created with .for" do
-      it "is false when slicing a buffer created without a block" do
-        @buffer = IO::Buffer.for("test")
-        @buffer.slice.shared?.should be_false
-      end
-
-      it "is false when slicing a buffer created with a block" do
-        IO::Buffer.for(+"test") do |buffer|
-          buffer.slice.shared?.should be_false
-        end
-      end
-    end
-
-    ruby_version_is "3.3" do
-      context "created with .string" do
-        it "is false" do
-          IO::Buffer.string(4) do |buffer|
-            buffer.slice.shared?.should be_false
-          end
-        end
-      end
-    end
+  it "is false for a null buffer" do
+    @buffer = IO::Buffer.new(0)
+    @buffer.shared?.should be_false
   end
 end