Second shot at fixing tests for Linux.

src/test/java/de/monticore/lang/monticar/mpp/montimath/HTMLMathPrettyPrinterTest.java

@@ -47,10 +47,8 @@ public class HTMLMathPrettyPrinterTest {
             Optional<ASTMathCompilationUnit> astOptional = parser.parse(sourceModel.toString());
             String input = FileUtils.readFileToString(targetModel, "UTF-8");
             String output = printer.prettyPrint(astOptional.get());
-            String separator = System.lineSeparator();
 
-            assertEquals(StringUtils.countMatches(input, separator), StringUtils.countMatches(output, separator));
-            assertEquals(input.replaceAll("\\R", ""), output.replaceAll("\\R", ""));
+            assertEquals(input.replaceAll("\\R", "\n"), output.replaceAll("\\R", "\n"));
         }
     }
 }

src/test/java/de/monticore/lang/monticar/mpp/montimath/MathPrettyPrinterTest.java

@@ -48,10 +48,8 @@ public class MathPrettyPrinterTest {
             Optional<ASTMathCompilationUnit> astOptional = parser.parse(sourceModel.toString());
             String input = FileUtils.readFileToString(targetModel, "UTF-8");
             String output = printer.prettyPrint(astOptional.get());
-            String separator = System.lineSeparator();
 
-            assertEquals(StringUtils.countMatches(input, separator), StringUtils.countMatches(output, separator));
-            assertEquals(input.replaceAll("\\R", ""), output.replaceAll("\\R", ""));
+            assertEquals(input.replaceAll("\\R", "\n"), output.replaceAll("\\R", "\n"));
         }
     }