fix test case

key.core/src/main/java/de/uka/ilkd/key/speclang/njml/JmlMarkerDecision.java

@@ -129,6 +129,15 @@ private boolean consume(String str) {
         return false;
     }
 
+    /**
+     * Given a string of conditions of a JML comment, that method decides whether the conditions are
+     * met.
+     *
+     * @param foundKeys a string of conditions, e.g., {@code "+key+esc-float"}. Should not contain
+     *        whitespaces.
+     * @return true whether the given conditions are met and the comment should be considered as
+     *         active.
+     */
     public boolean isActiveJmlSpec(String foundKeys) {
         if (foundKeys.isEmpty()) {
             // a JML annotation with no keys is always included,

key.core/src/test/java/de/uka/ilkd/key/speclang/jml/JmlMarkerDecisionTest.java

@@ -0,0 +1,35 @@
+/* This file is part of KeY - https://key-project.org
+ * KeY is licensed under the GNU General Public License Version 2
+ * SPDX-License-Identifier: GPL-2.0-only */
+package de.uka.ilkd.key.speclang.jml;
+
+import de.uka.ilkd.key.speclang.njml.JmlMarkerDecision;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+public class JmlMarkerDecisionTest {
+
+    @Test
+    public void testIsActiveJmlSpec() {
+        JmlMarkerDecision dec = new JmlMarkerDecision(null);
+        assertFalse(dec.isActiveJmlSpec("+ESC"));
+        assertFalse(dec.isActiveJmlSpec("+a+b+c"));
+        assertFalse(dec.isActiveJmlSpec("+a"));
+        assertFalse(dec.isActiveJmlSpec("-key+key"));
+        assertFalse(dec.isActiveJmlSpec("-"));
+        assertFalse(dec.isActiveJmlSpec("+"));
+        assertFalse(dec.isActiveJmlSpec("+ke y"));
+
+        assertTrue(dec.isActiveJmlSpec("+key-a b"));
+        assertTrue(dec.isActiveJmlSpec("+a+key"));
+        assertTrue(dec.isActiveJmlSpec("+key"));
+        assertTrue(dec.isActiveJmlSpec("+key"));
+        assertTrue(dec.isActiveJmlSpec("+KEY"));
+        assertTrue(dec.isActiveJmlSpec("+KEY"));
+        assertTrue(dec.isActiveJmlSpec(""));
+    }
+}