Fix wav files not being rewound, such as when they are missing their …

…file extension

lib/wahwah/riff_tag.rb

@@ -41,6 +41,7 @@ def channel_mode
     private
 
     def parse
+      @file_io.rewind
       top_chunk = Riff::Chunk.new(@file_io)
       return unless top_chunk.valid?
 

lib/wahwah/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module WahWah
-  VERSION = "1.6.4"
+  VERSION = "1.6.5"
 end

test/wahwah/riff_tag_test.rb

@@ -66,4 +66,25 @@ def test_tag_that_riff_chunk_without_data_chunk
       assert_equal 16, tag.bit_depth
     end
   end
+
+  def test_tag_works_with_file_missing_extension
+    blob_data = binary_data("test/files/id3v2.wav")
+
+    Tempfile.create("temp-audio-file", binmode: true) do |temp_file|
+      temp_file.write blob_data
+      tag = WahWah::RiffTag.new(temp_file)
+
+      assert_equal "China Girl", tag.title
+      assert_equal "Iggy Pop", tag.artist
+      assert_equal "The Idiot", tag.album
+      assert_equal "1977", tag.year
+      assert_equal "Rock", tag.genre
+      assert_equal ["Iggy Pop Rocks"], tag.comments
+      assert_equal 8.001133947554926, tag.duration
+      assert_equal 1411, tag.bitrate
+      assert_equal "Stereo", tag.channel_mode
+      assert_equal 44100, tag.sample_rate
+      assert_equal 16, tag.bit_depth
+    end
+  end
 end