diff --git a/common/unsafe/src/test/java/org/apache/spark/unsafe/types/UTF8StringSuite.java b/common/unsafe/src/test/java/org/apache/spark/unsafe/types/UTF8StringSuite.java
index 773461bcc9c3..ea79c28151ed 100644
--- a/common/unsafe/src/test/java/org/apache/spark/unsafe/types/UTF8StringSuite.java
+++ b/common/unsafe/src/test/java/org/apache/spark/unsafe/types/UTF8StringSuite.java
@@ -63,6 +63,9 @@ public void basicTest() {
     checkBasic("hello", 5); // 5 * 1 byte chars
     checkBasic("大 千 世 界", 7);
     checkBasic("︽﹋％", 3); // 3 * 3 bytes chars
+    // checkstyle.off: AvoidEscapedUnicodeCharacters
+    checkBasic("\uD83E\uDD19", 1); // 4 bytes char
+    // checkstyle.on: AvoidEscapedUnicodeCharacters
   }
 
   @Test
diff --git a/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorterSuite.java b/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorterSuite.java
index 12497c7f92ed..17c4d7e5b988 100644
--- a/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorterSuite.java
+++ b/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorterSuite.java
@@ -480,18 +480,17 @@ public void testOOMDuringSpill() throws Exception {
     memoryManager.markconsequentOOM(2);
     try {
       insertNumber(sorter, 1024);
-        fail("expected OutOfMmoryError but " +
-                "it seems operation surprisingly succeeded");
+      fail("expected OutOfMmoryError but it seems operation surprisingly succeeded");
     }
     // We expect an OutOfMemoryError here, anything else
     // (i.e the original NPE is a failure)
     catch (OutOfMemoryError oom){
       String oomStackTrace = Utils.exceptionString(oom);
-        assertThat("expected OutOfMemoryError in " +
-                   "org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.reset",
-              oomStackTrace,
-              Matchers.containsString("org.apache.spark.util.collection." +
-                      "unsafe.sort.UnsafeInMemorySorter.reset"));
+      assertThat("expected OutOfMemoryError in " +
+        "org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.reset",
+        oomStackTrace,
+        Matchers.containsString(
+          "org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.reset"));
     }
   }
 }
diff --git a/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorterSuite.java b/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorterSuite.java
index 359426d82932..c14553232851 100644
--- a/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorterSuite.java
+++ b/core/src/test/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorterSuite.java
@@ -174,14 +174,12 @@ public int compare(
       }
     };
     UnsafeInMemorySorter sorter = new UnsafeInMemorySorter(consumer, memoryManager,
-            recordComparator, prefixComparator,
-            100, shouldUseRadixSort());
+            recordComparator, prefixComparator, 100, shouldUseRadixSort());
 
     testMemoryManager.markExecutionAsOutOfMemoryOnce();
     try {
       sorter.reset();
-        fail("expected OutOfMmoryError " +
-                "but it seems operation surprisingly succeeded");
+      fail("expected OutOfMmoryError but it seems operation surprisingly succeeded");
     } catch (OutOfMemoryError oom) {
       // as expected
     }