Added missing tests

Author: egonw

org.pathvisio.lib/src/test/java/org/pathvisio/libgpml/io/ConverterExceptionTest.java

@@ -0,0 +1,43 @@
+/* Copyright 2025 Egon Willighagen <egonw@users.sf.net>
+ * 
+ * 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 org.pathvisio.libgpml.io;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import junit.framework.TestCase;
+
+/**
+ * Test for reading and writing of a single GPML2021 file, for
+ * troubleshooting and resolving specific issues.
+ */
+public class ConverterExceptionTest extends TestCase {
+
+	@Test
+	public void testConstructor() {
+		Exception exception = new ConverterException("Something bad happened");
+		Assert.assertNotNull(exception);
+		Assert.assertSame("Something bad happened", exception.getMessage());
+	}
+
+	@Test
+	public void testConstructor_Exception() {
+		Exception exception = new ConverterException(new Exception("Something bad happened"));
+		Assert.assertNotNull(exception);
+		Assert.assertNotNull(exception.getMessage());
+		Assert.assertTrue(exception.getMessage().contains("Something bad happened"));
+	}
+
+}