Fixing some tests.

- Change imports in test MultipleFiles
- Organize imports in test InsertRelations

src/test/java/org/jastadd/relast/tests/InsertRelations.java

 package org.jastadd.relast.tests;
 
-import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import relations.ast.A;
 import relations.ast.B;
 import relations.ast.Root;
 
-import java.io.IOException;
-import java.nio.charset.Charset;
 import java.util.Arrays;
 
-import static org.jastadd.relast.tests.TestHelpers.readFile;
 import static org.junit.jupiter.api.Assertions.*;
 
 

src/test/java/org/jastadd/relast/tests/MultipleFiles.java

@@ -2,9 +2,9 @@ package org.jastadd.relast.tests;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import relations.ast.A;
-import relations.ast.B;
-import relations.ast.Root;
+import multiple.ast.A;
+import multiple.ast.B;
+import multiple.ast.Root;
 
 import java.util.Arrays;