text: Test all implementations of `escape_to_c`

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>

diff --git a/lib/core/text/test_abstract_text.nit b/lib/core/text/test_abstract_text.nit
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+++ b/lib/core/text/test_abstract_text.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# This file is free software, which comes along with NIT.  This software is
+# distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+# without  even  the implied warranty of  MERCHANTABILITY or  FITNESS FOR A
+# PARTICULAR PURPOSE.  You can modify it is you want,  provided this header
+# is kept unaltered, and a notification of the changes is added.
+# You  are  allowed  to  redistribute it and sell it, alone or is a part of
+# another product.
+
+module test_abstract_text is test_suite
+
+import test_suite
+import text
+intrude import ropes
+
+class TestText
+       super TestSuite
+
+       private var factories: Collection[TextFactory] = [
+               new ConcatFactory,
+               new RopeBufferFactory,
+               new FlatBufferFactory
+       : TextFactory]
+
+       fun test_escape_to_c do
+               for f in factories do
+                       assert f.create("abAB12<>&").escape_to_c       == "abAB12<>&"
+                       assert f.create("\n\"'\\").escape_to_c         == "\\n\\\"\\'\\\\"
+                       assert f.create("allo???!").escape_to_c        == "allo??\\?!"
+                       assert f.create("??=??/??'??(??)").escape_to_c == "?\\?=?\\?/??\\'?\\?(?\\?)"
+                       assert f.create("??!??<??>??-").escape_to_c    == "?\\?!?\\?<?\\?>?\\?-"
+               end
+       end
+end
+
+# A factory that creates instances of a particular implementation of `Text`
+interface TextFactory
+
+       # Create a `Text` instance from the specified string
+       fun create(s: String): Text is abstract
+end
+
+
+class ConcatFactory
+       super TextFactory
+
+       redef fun create(s) do return new Concat("", s)
+end
+
+class RopeBufferFactory
+       super TextFactory
+
+       redef fun create(s) do return new RopeBuffer.from(s)
+end
+
+class FlatBufferFactory
+       super TextFactory
+
+       redef fun create(s) do return new FlatBuffer.from(s)
+end