Add dummy tests for hsregex module to fix jacoco

hsregex/src/test/java/org/pgpainless/algorithm/HSRegexInterpreterFactoryTest.java

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.algorithm;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class HSRegexInterpreterFactoryTest {
+
+    @Test
+    public void dummyRegexTest() {
+        HSRegexInterpreterFactory factory = new HSRegexInterpreterFactory();
+        RegexInterpreterFactory.setInstance(factory);
+        Regex regex = RegexInterpreterFactory.create("Alice|Bob");
+
+        assertTrue(regex.matches("Alice"));
+        assertTrue(regex.matches("Bob"));
+        assertFalse(regex.matches("Charlie"));
+    }
+}

hsregex/src/test/java/org/pgpainless/algorithm/package-info.java

@@ -0,0 +1,10 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+/**
+ * Regex interpreter implementation based on Henry Spencers Regular Expression library.
+ *
+ * @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-8">RFC4880 - §8. Regular Expressions</a>
+ */
+package org.pgpainless.algorithm;