And fix 5

Author: julik

spec/zip_kit/block_deflate_spec.rb

@@ -100,7 +100,7 @@ def tag_deflated(deflated_string, raw_string)
 
     it "does not write the end marker" do
       input_string = "compressible" * (1024 * 1024 * 10)
-      output_string = ""
+      output_string = +""
 
       described_class.deflate_in_blocks(StringIO.new(input_string), StringIO.new(output_string))
       expect(output_string).not_to be_empty
@@ -109,7 +109,7 @@ def tag_deflated(deflated_string, raw_string)
 
     it "returns the number of bytes written" do
       input_string = "compressible" * (1024 * 1024 * 10)
-      output_string = ""
+      output_string = +""
 
       num_bytes = described_class.deflate_in_blocks(StringIO.new(input_string),
         StringIO.new(output_string))

spec/zip_kit/write_and_tell_spec.rb

@@ -2,7 +2,7 @@
 
 describe ZipKit::WriteAndTell do
   it "maintains the count of bytes written" do
-    adapter = described_class.new("")
+    adapter = described_class.new(+"")
     expect(adapter.tell).to be_zero
 
     adapter << "hello"
@@ -19,16 +19,16 @@
       [12, 123, 0, 3].pack("C*")
     ]
 
-    buf = "превед".force_encoding(Encoding::BINARY)
+    buf = "превед".dup.force_encoding(Encoding::BINARY)
     writer = described_class.new(buf)
     strs.each { |s| writer << s }
     expect(writer.tell).to eq(79)
     expect(buf.bytesize).to eq(91) # It already contained some bytes
   end
 
   it "does not change the encoding of the source string" do
-    str = "текста кусок".force_encoding(Encoding::UTF_8)
-    buf = "превед".force_encoding(Encoding::BINARY)
+    str = "текста кусок".dup.force_encoding(Encoding::UTF_8)
+    buf = "превед".dup.force_encoding(Encoding::BINARY)
     writer = described_class.new(buf)
     writer << str
     expect(buf.bytesize).to eq(35)
@@ -60,7 +60,7 @@ def stream_with_just_write.write(bytes)
   end
 
   it "advances the internal pointer using advance_position_by" do
-    str = ""
+    str = +""
 
     adapter = described_class.new(str)
     expect(adapter.tell).to be_zero