[kotlin.test] Do not run test suites containing only ignored tests

Popular frameworks such as JUnit, TestNG and Google Test do not
run @BeforeClass/@AfterClass hooks of test suites containing only
ignored tests.

This patch introduces the same behaviour to the Kotlin/Native's
kotlin.test runner.

See also: #4522, #4615.

kotlin-native/backend.native/tests/build.gradle

@@ -3530,15 +3530,14 @@ standaloneTest("testing_filtered_suites") {
             ["A.*"],                    // filter out a top-level suite.
             ["*.common"],               // run a test from all suites -> all hooks executed.
             ["Ignored.*"],              // an ignored suite -> no hooks executed.
-            ["A.ignored"]               // a suite with only ignored tests.
+            ["A.ignored"]               // a suite with only ignored tests -> no hooks executed.
-                                        //      TODO: Currently we execute hooks while other frameworks don't. Fix it.
     ]
     def expectedHooks = [
             ["Filtered_suitesKt.before", "Filtered_suitesKt.after"],
             ["A.before", "A.after"],
             ["A.before", "A.after", "Filtered_suitesKt.before", "Filtered_suitesKt.after"],
             [],
-            ["A.before", "A.after"],  // TODO: fix it.
+            []
     ]
 
     multiRuns = true

kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/test/TestRunner.kt

@@ -225,6 +225,15 @@ internal class TestRunner(val suites: List<TestSuite>, args: Array<String>) {
     }
 
     private fun TestSuite.run() {
+        // Do not run @BeforeClass/@AfterClass hooks if all test cases are ignored.
+        if (testCases.values.all { it.ignored }) {
+            testCases.values.forEach { testCase ->
+                sendToListeners { ignore(testCase) }
+            }
+            return
+        }
+
+        // Normal path: run all hooks and execute test cases.
         doBeforeClass()
         testCases.values.forEach { testCase ->
             if (testCase.ignored) {