Added the test for #88 as well; thx @shagkur

ph-css/src/test/java/com/helger/css/supplementary/issues/Issue88Test.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2014-2024 Philip Helger (www.helger.com)
+ * philip[at]helger[dot]com
+ *
+ * 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.
+ */
+package com.helger.css.supplementary.issues;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+
+import com.helger.css.ECSSVersion;
+import com.helger.css.decl.CascadingStyleSheet;
+import com.helger.css.reader.CSSReader;
+import com.helger.css.reader.CSSReaderSettings;
+import com.helger.css.writer.CSSWriter;
+import com.helger.css.writer.CSSWriterSettings;
+
+/**
+ * Test for issue 88: https://github.com/phax/ph-css/issues/88
+ *
+ * @author Mike Wiedenbauer
+ */
+public final class Issue88Test
+{
+  @Test
+  public void testIssue ()
+  {
+    final String sCSS = ":where(.some-tile:not(.preserve-color))>*{color:#161616}";
+    final CascadingStyleSheet aCSS = CSSReader.readFromStringReader (sCSS,
+                                                                     new CSSReaderSettings ().setCSSVersion (ECSSVersion.LATEST));
+    assertNotNull (aCSS);
+    assertEquals (":where(.some-tile:not(.preserve-color))>*{color:#161616}",
+                  new CSSWriter (new CSSWriterSettings ().setOptimizedOutput (true)).setWriteHeaderText (false)
+                                                                                    .getCSSAsString (aCSS));
+  }
+}