So many changes. Some tests

test/test_picopackage.rb

@@ -8,7 +8,12 @@ class TestPicopackage < Minitest::Test
   end
 
   def test_it_can_load_a_picopackage_file
-    sf = Picopackage::SourceFile.from_content(File.read("test/files/uniquify_array.rb"))
-    assert_equal sf.metadata["filename"], "uniquify_array.rb"
+    sf = Picopackage::FileProvider.new(File.read("test/files/uniquify_array_packaged.rb"))
+    assert_equal "uniquify_array_packaged.rb", sf.metadata.filename
+  end
+
+  def test_it_can_create_a_picopackage_from_bare_file
+    sf = Picopackage::FileProvider.new(File.read("test/files/uniquify_array_bare.rb"))
+    assert_equal "uniquify_array_bare.rb", sf.metadata.filename
   end
 end