Add test to show problem with function returning BLOB

Author: Jim Flood

test/test_database.rb

@@ -261,12 +261,19 @@ def test_function_return
     end
 
     def test_function_return_types
-      [10, 2.2, nil, "foo"].each do |thing|
+      [10, 2.2, nil, "foo", Blob.new("foo\0bar")].each do |thing|
         @db.define_function("hello") { |a| thing }
         assert_equal [thing], @db.execute("select hello('world')").first
       end
     end
 
+    def test_function_return_type_round_trip
+      [10, 2.2, nil, "foo", Blob.new("foo\0bar")].each do |thing|
+        @db.define_function("hello") { |thing| thing }
+        assert_equal [thing], @db.execute("select hello(hello(?))", [thing]).first
+      end
+    end
+
     def test_define_function_closed
       @db.close
       assert_raise(SQLite3::Exception) do