Added some Unit Tests to increase code coverage

src/test/java/org/apache/commons/scxml2/env/minimal/MinimalEvaluatorTest.java

@@ -0,0 +1,63 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.commons.scxml2.env.minimal;
+
+import org.apache.commons.scxml2.Context;
+import org.apache.commons.scxml2.SCInstance;
+import org.apache.commons.scxml2.SCXMLExecutor;
+import org.apache.commons.scxml2.SCXMLExpressionException;
+import org.apache.commons.scxml2.env.SimpleDispatcher;
+import org.apache.commons.scxml2.env.Tracer;
+import org.apache.commons.scxml2.semantics.SCXMLSemanticsImpl;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Unit tests for class {@link MinimalEvaluator}.
+ *
+ * @see MinimalEvaluator
+ *
+ */
+public class MinimalEvaluatorTest{
+
+
+    @Test
+    public void testEvalCond() throws SCXMLExpressionException {
+        MinimalEvaluator minimalEvaluator = new MinimalEvaluator();
+        SCXMLExecutor sCXMLExecutor = new SCXMLExecutor(minimalEvaluator, new SimpleDispatcher(), new Tracer(), new SCXMLSemanticsImpl());
+        SCInstance sCInstance = sCXMLExecutor.detachInstance();
+        Context context = sCInstance.getSystemContext();
+
+
+        assertFalse(minimalEvaluator.evalCond(minimalEvaluator.newContext(context), "In("));
+    }
+
+
+    @Test
+    public void testEvalCondWithNull() throws SCXMLExpressionException {
+        MinimalEvaluator minimalEvaluator = new MinimalEvaluator();
+        SCXMLExecutor sCXMLExecutor = new SCXMLExecutor(minimalEvaluator, new SimpleDispatcher(), new Tracer(), new SCXMLSemanticsImpl());
+        SCInstance sCInstance = sCXMLExecutor.detachInstance();
+        Context context = sCInstance.getSystemContext();
+
+
+        assertFalse(minimalEvaluator.evalCond(minimalEvaluator.newContext(context), null));
+    }
+
+
+}