Fix secure test execution problem when executed from CLI

Author: bbottema

modules/core-test-module/src/main/java/testutil/SecureTestDataHelper.java

@@ -46,7 +46,7 @@ private static Properties accessSecureTestData()
 		return passwords;
 	}
 
-	private static void cleanupSecureTestData() {
+	public static void cleanupSecureTestData() {
 		final File file = new File(RESOURCES + "/secure-testdata/secure-testdata");
 
 		int tries = 0;

modules/simple-java-mail/src/test/java/org/simplejavamail/internal/smimesupport/ReadSmimeSelfSignedTest.java

@@ -211,6 +211,9 @@ public void testEncryptedMessageEml_LegacySignedEnvelopedAttachment()
 	@Test
 	public void testNPE_InSmimeUtilFixed()
 			throws Exception {
+		// for some reason running this test from CLI fails without this line
+		// I think a previous cleanup failed or couldn't be executed successfully
+		SecureTestDataHelper.cleanupSecureTestData();
 		SecureTestDataHelper.runTestWithSecureTestData(passwords -> {
 			String fileNameMsg = RESOURCES + "/secure-testdata/secure-testdata/npe-SmimeUtilFixed-test-email/NPE_SmimeUtilFixed Test Mail.msg";
 			FileInputStream fileInputStream = new FileInputStream(fileNameMsg);