use run instead of main

Author: SE-FDr

tool/src/test/java/de/monticore/ocl/tool/OCLToolTest.java

@@ -35,7 +35,7 @@ public void setup() {
   public void testPrettyPrint() throws IOException {
     ByteArrayOutputStream out = new ByteArrayOutputStream();
     System.setOut(new PrintStream(out));
-    OCLTool.main(new String[] {"-i", oclv1, "-pp"});
+    new OCLTool().run(new String[] {"-i", oclv1, "-pp"});
     String printed = out.toString().trim();
     assertNotNull(printed);
     Optional<ASTOCLCompilationUnit> astOpt = OCLMill.parser().parse_String(printed);