Fix minor mistakes in rate limiter unit test (apache#8253)

1、acquirePermist  -> acquirePermits
2、remove some useless 'throws Exception'

pulsar-common/src/test/java/org/apache/pulsar/common/util/RateLimiterTest.java

@@ -18,15 +18,14 @@
  */
 package org.apache.pulsar.common.util;
 
-import static org.testng.Assert.fail;
-import static org.testng.Assert.assertTrue;
-import static org.testng.Assert.assertFalse;
 import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertFalse;
+import static org.testng.Assert.assertTrue;
+import static org.testng.Assert.fail;
 
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Supplier;
-
 import org.testng.annotations.Test;
 
 public class RateLimiterTest {
@@ -49,7 +48,7 @@ public void testInvalidRenewTime() {
     }
 
     @Test
-    public void testclose() throws Exception {
+    public void testClose() throws Exception {
         RateLimiter rate = new RateLimiter(1, 1000, TimeUnit.MILLISECONDS);
         assertFalse(rate.isClosed());
         rate.close();
@@ -95,11 +94,11 @@ public void testAcquire() throws Exception {
     public void testMultipleAcquire() throws Exception {
         final long rateTimeMSec = 1000;
         final int permits = 100;
-        final int acquirePermist = 50;
+        final int acquirePermits = 50;
         RateLimiter rate = new RateLimiter(permits, rateTimeMSec, TimeUnit.MILLISECONDS);
         long start = System.currentTimeMillis();
-        for (int i = 0; i < permits / acquirePermist; i++) {
-            rate.acquire(acquirePermist);
+        for (int i = 0; i < permits / acquirePermits; i++) {
+            rate.acquire(acquirePermits);
         }
         long end = System.currentTimeMillis();
         assertTrue((end - start) < rateTimeMSec);
@@ -108,7 +107,7 @@ public void testMultipleAcquire() throws Exception {
     }
 
     @Test
-    public void testTryAcquireNoPermits() throws Exception {
+    public void testTryAcquireNoPermits() {
         final long rateTimeMSec = 1000;
         RateLimiter rate = new RateLimiter(1, rateTimeMSec, TimeUnit.MILLISECONDS);
         assertTrue(rate.tryAcquire());
@@ -118,7 +117,7 @@ public void testTryAcquireNoPermits() throws Exception {
     }
 
     @Test
-    public void testTryAcquire() throws Exception {
+    public void testTryAcquire() {
         final long rateTimeMSec = 1000;
         final int permits = 100;
         RateLimiter rate = new RateLimiter(permits, rateTimeMSec, TimeUnit.MILLISECONDS);
@@ -130,13 +129,13 @@ public void testTryAcquire() throws Exception {
     }
 
     @Test
-    public void testMultipleTryAcquire() throws Exception {
+    public void testMultipleTryAcquire() {
         final long rateTimeMSec = 1000;
         final int permits = 100;
-        final int acquirePermist = 50;
+        final int acquirePermits = 50;
         RateLimiter rate = new RateLimiter(permits, rateTimeMSec, TimeUnit.MILLISECONDS);
-        for (int i = 0; i < permits / acquirePermist; i++) {
-            rate.tryAcquire(acquirePermist);
+        for (int i = 0; i < permits / acquirePermits; i++) {
+            rate.tryAcquire(acquirePermits);
         }
         assertEquals(rate.getAvailablePermits(), 0);
         rate.close();
@@ -166,19 +165,19 @@ public void testResetRate() throws Exception {
     }
 
     @Test
-    public void testRateLimiterWithPermitUpdater() throws Exception{
+    public void testRateLimiterWithPermitUpdater() throws Exception {
         long permits = 10;
         long rateTime = 1;
         long newUpdatedRateLimit = 100L;
         Supplier<Long> permitUpdater = () -> newUpdatedRateLimit;
-        RateLimiter limiter = new RateLimiter(null, permits , 1, TimeUnit.SECONDS, permitUpdater);
+        RateLimiter limiter = new RateLimiter(null, permits, 1, TimeUnit.SECONDS, permitUpdater);
         limiter.acquire();
-        Thread.sleep(rateTime*3*1000);
+        Thread.sleep(rateTime * 3 * 1000);
         assertEquals(limiter.getAvailablePermits(), newUpdatedRateLimit);
     }
 
     @Test
-    public void testRateLimiterWithFunction()throws Exception {
+    public void testRateLimiterWithFunction() {
         final AtomicInteger atomicInteger = new AtomicInteger(0);
         long permits = 10;
         long rateTime = 1;