Switch to JUnit 4 assumptions

log4j-core-test/src/test/java/org/apache/logging/log4j/core/appender/rolling/RollingAppenderRestartTest.java

@@ -16,14 +16,14 @@
  */
 package org.apache.logging.log4j.core.appender.rolling;
 
+import static junit.framework.Assert.fail;
 import static org.apache.logging.log4j.core.test.hamcrest.Descriptors.that;
 import static org.apache.logging.log4j.core.test.hamcrest.FileMatchers.hasName;
 import static org.hamcrest.Matchers.endsWith;
 import static org.hamcrest.Matchers.hasItemInArray;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.junit.jupiter.api.Assertions.fail;
-import static org.junit.jupiter.api.Assumptions.assumeTrue;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assume.assumeTrue;
 
 import java.io.File;
 import java.io.IOException;
@@ -100,7 +100,7 @@ public void testAppender() throws Exception {
         Thread.yield();
         final String name = "RollingFile";
         final RollingFileAppender appender = loggerContextRule.getAppender(name);
-        assertNotNull(appender, name);
+        assertNotNull(name, appender);
         if (appender.getManager().getSemaphore().tryAcquire(5, TimeUnit.SECONDS)) {
             // If we are in here, either the rollover is done or has not taken place yet.
             validate();
@@ -114,7 +114,7 @@ private void validate() {
         final File[] files = DIR.toFile().listFiles();
         Arrays.sort(files);
         assertTrue(
-                hasGzippedFile.matches(files),
-                () -> "was expecting files with '.gz' suffix, found: " + Arrays.toString(files));
+                "was expecting files with '.gz' suffix, found: " + Arrays.toString(files),
+                hasGzippedFile.matches(files));
     }
 }