1 files changed, 79 insertions, 2 deletions

diff --git a/spec/ruby/core/io/pread_spec.rb b/spec/ruby/core/io/pread_spec.rb
index 43071d6a31..28afc80e5c 100644
--- a/spec/ruby/core/io/pread_spec.rb
+++ b/spec/ruby/core/io/pread_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 require_relative '../../spec_helper'
 
-platform_is_not :windows do
+guard -> { platform_is_not :windows or ruby_version_is "3.3" } do
   describe "IO#pread" do
     before :each do
       @fname = tmp("io_pread.txt")
@@ -21,16 +21,93 @@ platform_is_not :windows do
     end
 
     it "accepts a length, an offset, and an output buffer" do
-      buffer = "foo"
+      buffer = +"foo"
       @file.pread(3, 4, buffer)
       buffer.should == "567"
     end
 
+    it "shrinks the buffer in case of less bytes read" do
+      buffer = +"foo"
+      @file.pread(1, 0, buffer)
+      buffer.should == "1"
+    end
+
+    it "grows the buffer in case of more bytes read" do
+      buffer = +"foo"
+      @file.pread(5, 0, buffer)
+      buffer.should == "12345"
+    end
+
     it "does not advance the file pointer" do
       @file.pread(4, 0).should == "1234"
       @file.read.should == "1234567890"
     end
 
+    it "ignores the current offset" do
+      @file.pos = 3
+      @file.pread(4, 0).should == "1234"
+    end
+
+    it "returns an empty string for maxlen = 0" do
+      @file.pread(0, 4).should == ""
+    end
+
+    it "ignores the offset for maxlen = 0, even if it is out of file bounds" do
+      @file.pread(0, 400).should == ""
+    end
+
+    it "does not reset the buffer when reading with maxlen = 0" do
+      buffer = +"foo"
+      @file.pread(0, 4, buffer)
+      buffer.should == "foo"
+
+      @file.pread(0, 400, buffer)
+      buffer.should == "foo"
+    end
+
+    it "converts maxlen to Integer using #to_int" do
+      maxlen = mock('maxlen')
+      maxlen.should_receive(:to_int).and_return(4)
+      @file.pread(maxlen, 0).should == "1234"
+    end
+
+    it "converts offset to Integer using #to_int" do
+      offset = mock('offset')
+      offset.should_receive(:to_int).and_return(0)
+      @file.pread(4, offset).should == "1234"
+    end
+
+    it "converts a buffer to String using to_str" do
+      buffer = mock('buffer')
+      buffer.should_receive(:to_str).at_least(1).and_return(+"foo")
+      @file.pread(4, 0, buffer)
+      buffer.should_not.is_a?(String)
+      buffer.to_str.should == "1234"
+    end
+
+    it "raises TypeError if maxlen is not an Integer and cannot be coerced into Integer" do
+      maxlen = Object.new
+      -> { @file.pread(maxlen, 0) }.should raise_error(TypeError, 'no implicit conversion of Object into Integer')
+    end
+
+    it "raises TypeError if offset is not an Integer and cannot be coerced into Integer" do
+      offset = Object.new
+      -> { @file.pread(4, offset) }.should raise_error(TypeError, 'no implicit conversion of Object into Integer')
+    end
+
+    it "raises ArgumentError for negative values of maxlen" do
+      -> { @file.pread(-4, 0) }.should raise_error(ArgumentError, 'negative string size (or size too big)')
+    end
+
+    it "raised Errno::EINVAL for negative values of offset" do
+      -> { @file.pread(4, -1) }.should raise_error(Errno::EINVAL, /Invalid argument/)
+    end
+
+    it "raises TypeError if the buffer is not a String and cannot be coerced into String" do
+      buffer = Object.new
+      -> { @file.pread(4, 0, buffer) }.should raise_error(TypeError, 'no implicit conversion of Object into String')
+    end
+
     it "raises EOFError if end-of-file is reached" do
       -> { @file.pread(1, 10) }.should raise_error(EOFError)
     end