diff --git a/testng-core/src/main/java/org/testng/JarFileUtils.java b/testng-core/src/main/java/org/testng/JarFileUtils.java
index c0bb86f5b0..49f34d8996 100644
--- a/testng-core/src/main/java/org/testng/JarFileUtils.java
+++ b/testng-core/src/main/java/org/testng/JarFileUtils.java
@@ -95,7 +95,8 @@ private boolean testngXmlExistsInJar(File jarFile, List<String> classes) throws
           TestNamesMatcher testNamesMatcher = new TestNamesMatcher(suite, testNames);
           List<String> missMatchedTestname = testNamesMatcher.getMissMatchedTestNames();
           if (!missMatchedTestname.isEmpty()) {
-            throw new TestNGException("The test(s) <" + missMatchedTestname + "> cannot be found.");
+            throw new TestNGException(
+                "The test(s) <" + missMatchedTestname + "> cannot be found in suite: " + suite.getName());
           }
           suites.addAll(testNamesMatcher.getSuitesMatchingTestNames());
         } else {
diff --git a/testng-core/src/main/java/org/testng/TestNG.java b/testng-core/src/main/java/org/testng/TestNG.java
index 3cbebe07fd..681d0ae237 100644
--- a/testng-core/src/main/java/org/testng/TestNG.java
+++ b/testng-core/src/main/java/org/testng/TestNG.java
@@ -353,7 +353,8 @@ private Collection<XmlSuite> processCommandLineArgs(Collection<XmlSuite> allSuit
       TestNamesMatcher testNamesMatcher = new TestNamesMatcher(s, m_testNames);
       List<String> missMatchedTestname = testNamesMatcher.getMissMatchedTestNames();
       if (!missMatchedTestname.isEmpty()) {
-        throw new TestNGException("The test(s) <" + missMatchedTestname + "> cannot be found.");
+        throw new TestNGException(
+            "The test(s) <" + missMatchedTestname + "> cannot be found, in suite: " + s.getName());
       }
       result.addAll(testNamesMatcher.getSuitesMatchingTestNames());
     }
@@ -420,7 +421,8 @@ public void initializeSuitesAndJarFile() {
         new JarFileUtils(getProcessor(), m_xmlPathInJar, m_testNames, m_parallelMode);
 
     Collection<XmlSuite> allSuites = utils.extractSuitesFrom(jarFile);
-    m_suites.addAll(processCommandLineArgs(allSuites));
+    allSuites.stream().forEach(s -> processParallelModeCommandLineArgs(s));
+    m_suites.addAll(allSuites);
   }
 
   /** @param threadCount Define the number of threads in the thread pool. */
diff --git a/testng-core/src/test/java/org/testng/JarFileUtilsTest.java b/testng-core/src/test/java/org/testng/JarFileUtilsTest.java
index a2fcb562aa..246a1d779e 100644
--- a/testng-core/src/test/java/org/testng/JarFileUtilsTest.java
+++ b/testng-core/src/test/java/org/testng/JarFileUtilsTest.java
@@ -55,7 +55,7 @@ public void testWithNoTestNames() throws MalformedURLException {
   @Test(
       expectedExceptions = TestNGException.class,
       expectedExceptionsMessageRegExp =
-          "\nThe test\\(s\\) <\\[testng-tests-child11\\]> cannot be found.")
+          "\nThe test\\(s\\) <\\[testng-tests-child11\\]> cannot be found in suite: testng-tests-suite")
   public void testWithInvalidTestNames() throws MalformedURLException {
     JarFileUtils utils = newJarFileUtils(Collections.singletonList("testng-tests-child11"));
     runTest(