[147] Dump backslashed keys

lib/toml-rb/dumper.rb

@@ -108,8 +108,13 @@ def bare_key?(key)
       !!key.to_s.match(/^[a-zA-Z0-9_-]*$/)
     end
 
+    # The key needs to use quotes according to TOML specs.
+    # Ruby representation of literals or strings, mixed with special characters
+    # made the concatenation error-prone, luckiley the `#inspect` method returns
+    # exactly what we need. I decided to keep the method `quote_key/1`
+    # for readability.
     def quote_key(key)
-      '"' + key.gsub('"', '\\"') + '"'
+      key.inspect
     end
   end
 end

test/dumper_test.rb

@@ -108,18 +108,35 @@ def test_dump_array_tables
   def test_dump_interpolation_curly
     hash = {"key" => "includes \#{variable}"}
     dumped = TomlRB.dump(hash)
+
     assert_equal %(key = "includes \#{variable}") + "\n", dumped
   end
 
   def test_dump_interpolation_at
     hash = {"key" => 'includes #@variable'}
     dumped = TomlRB.dump(hash)
+
     assert_equal 'key = "includes #@variable"' + "\n", dumped
   end
 
   def test_dump_interpolation_dollar
     hash = {"key" => 'includes #$variable'}
     dumped = TomlRB.dump(hash)
+
     assert_equal 'key = "includes #$variable"' + "\n", dumped
   end
+
+  def test_dump_special_chars_in_literals
+    hash = {'\t' => "escape special chars in string literals"}
+    dumped = TomlRB.dump(hash)
+
+    assert_equal %("\\\\t" = "escape special chars in string literals") + "\n", dumped
+  end
+
+  def test_dump_special_chars_in_strings
+    hash = {"\t" => "escape special chars in strings"}
+    dumped = TomlRB.dump(hash)
+
+    assert_equal %("\\t" = "escape special chars in strings") + "\n", dumped
+  end
 end