Fix JUnit warnings

.idea/libraries/junit_junit_4_11.xml

-<component name="libraryTable">
-  <library name="junit:junit:4.11" type="repository">
-    <properties maven-id="junit:junit:4.11" />
-    <CLASSES>
-      <root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.11/junit-4.11.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>
\ No newline at end of file

lab09-bfs.iml

@@ -8,7 +8,6 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="junit:junit:4.11" level="project" />
     <orderEntry type="library" name="org.junit.jupiter:junit-jupiter:5.4.0" level="project" />
     <orderEntry type="library" name="com.github.javaparser:javaparser-core:3.5.2" level="project" />
     <orderEntry type="library" name="com.btmatthews.hamcrest:hamcrest-matchers:1.0.1" level="application" />