add some more tests

Author: markxnelson

src/test/java/weblogic/logging/exporter/config/FilterConfigTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Licensed under the Universal Permissive License v 1.0 as shown at http://oss.oracle.com/licenses/upl.
+ */
+
+package weblogic.logging.exporter.config;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+@DisplayName("Test FilterConfig class")
+public class FilterConfigTest {
+
+  private static final String EXPECTED_STRING =
+      "FilterConfig{expression='MSGID != 'BEA-000449'', servers=[]}";
+
+  @DisplayName("Check toString() works as expected")
+  @Test
+  public void checkToStringWorksAsExpected() {
+    Map<String, Object> map = new HashMap<>();
+    map.put("FilterExpression", "MSGID != 'BEA-000449'");
+    FilterConfig filterConfig = FilterConfig.create(map);
+
+    assertEquals(EXPECTED_STRING, filterConfig.toString());
+  }
+}