Preserve repeated linebreaks when normalizing line endings

Author: bkeepers

lib/dotenv/parser.rb

@@ -43,7 +43,7 @@ def call(...)
 
     def initialize(string, overwrite: false)
       # Convert line breaks to same format
-      @string = string.gsub(/[\n\r]+/, "\n")
+      @string = string.gsub(/\r\n?/, "\n")
       @hash = {}
       @overwrite = overwrite
     end

spec/dotenv/parser_spec.rb

@@ -158,6 +158,11 @@ def env(...)
       .to eql("foo" => "bar", "fizz" => "buzz")
   end
 
+  it "does not ignore empty lines in quoted string" do
+    value = "a\n\nb\n\nc"
+    expect(env("FOO=\"#{value}\"")).to eql("FOO" => value)
+  end
+
   it "ignores inline comments" do
     expect(env("foo=bar # this is foo")).to eql("foo" => "bar")
   end