Streamline dataprovider invoking in abstract classes

Closes testng-team#2800

CHANGES.txt

@@ -1,4 +1,5 @@
 Current
+Fixed: GITHUB-2800: Running Test Classes with Inherited @Factory and @DataProvider Annotated Non-Static Methods Fail (Krishnan Mahadevan)
 New: Ability to provide custom error message for assertThrows\expectThrows methods (Anatolii Yuzhakov)
 Fixed: GITHUB-2780: Use SpotBugs instead of abandoned FindBugs
 Fixed: GITHUB-2801: JUnitReportReporter is too slow

gradle.properties

@@ -5,7 +5,7 @@ kotlin.code.style=official
 # Note: testng.kotlin-library.gradle.kts adds kotlin-stdlib for testImplementation
 kotlin.stdlib.default.dependency=false
 
-testng.version=7.6.1
+testng.version=7.6.2
 
 group=org.testng
 

testng-core/src/main/java/org/testng/internal/Parameters.java

@@ -610,7 +610,8 @@ private static IDataProviderMethod findDataProvider(
 
     Class<?> cls = clazz.getRealClass();
     boolean shouldBeStatic = false;
-    if (dataProviderClass != null) {
+    boolean isDataProviderClassAbstract = Modifier.isAbstract(cls.getModifiers());
+    if (dataProviderClass != null && !isDataProviderClassAbstract) {
       cls = dataProviderClass;
       shouldBeStatic = true;
     }

testng-core/src/test/java/test/dataprovider/DataProviderTest.java

@@ -43,6 +43,12 @@
 
 public class DataProviderTest extends SimpleBaseTest {
 
+  @Test(description = "GITHUB-2800")
+  public void testDataProviderFromAbstractClassWhenCoupledWithFactories() {
+    InvokedMethodNameListener listener = run(test.dataprovider.issue2800.TestClassGenerator.class);
+    assertThat(listener.getSucceedMethodNames()).containsExactly("hi", "hi");
+  }
+
   @Test(description = "GITHUB-1691")
   public void testDataProviderInfoIgnored() {
     InvokedMethodNameListener listener =

testng-core/src/test/java/test/dataprovider/issue2800/AbstractTestClassGenerator.java

@@ -0,0 +1,17 @@
+package test.dataprovider.issue2800;
+
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Factory;
+
+public abstract class AbstractTestClassGenerator {
+
+  @DataProvider(name = "dataProvider")
+  public Object[][] dataProvider() {
+    return new Object[][] {{"foo"}, {"bar"}};
+  }
+
+  @Factory(dataProvider = "dataProvider")
+  public Object[] testFactory(String value) {
+    return new Object[] {new TestClassSample()};
+  }
+}

testng-core/src/test/java/test/dataprovider/issue2800/TestClassGenerator.java

@@ -0,0 +1,3 @@
+package test.dataprovider.issue2800;
+
+public class TestClassGenerator extends AbstractTestClassGenerator {}

testng-core/src/test/java/test/dataprovider/issue2800/TestClassSample.java

@@ -0,0 +1,9 @@
+package test.dataprovider.issue2800;
+
+import org.testng.annotations.Test;
+
+public class TestClassSample {
+
+  @Test
+  public void hi() {}
+}