+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+module test_coloring is test
+
+import coloring
+
+class TestPOSetColorer
+ test
+
+ fun test_ids_strictly_positive is test do
+ var poset = new POSet[String]
+ poset.add_node "A"
+
+ var colorer = new POSetColorer[String]
+ colorer.colorize(poset)
+
+ assert colorer.ids["A"] > 0
+ end
+end