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YARN-11271. Upgrade JUnit from 4 to 5 in hadoop-yarn-server-timelineservice-hbase-common (#4774)

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Co-authored-by: Ashutosh Gupta <ashugpt@amazon.com>
Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
This commit is contained in:
Ashutosh Gupta 2022-09-25 15:30:58 +01:00 committed by GitHub
parent fd0415c44a
commit 603e9bd745
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6 changed files with 103 additions and 83 deletions
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21
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/hadoop-yarn-server-timelineservice-hbase-common/pom.xml
View File

@ -121,6 +121,21 @@
<artifactId>hadoop-shaded-guava</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-launcher</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
@ -139,12 +154,6 @@
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>

10
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/hadoop-yarn-server-timelineservice-hbase-common/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestCustomApplicationIdConversion.java
View File

@ -17,9 +17,11 @@
*/
package org.apache.hadoop.yarn.server.timelineservice.storage.common;
import org.junit.jupiter.api.Test;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.junit.Assert;
import org.junit.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* Test for HBaseTimelineStorageUtils.convertApplicationIdToString(),
@ -29,11 +31,11 @@
*/
public class TestCustomApplicationIdConversion {
@Test
public void testConvertAplicationIdToString() {
void testConvertAplicationIdToString() {
ApplicationId applicationId = ApplicationId.newInstance(0, 1);
String applicationIdStr =
HBaseTimelineSchemaUtils.convertApplicationIdToString(applicationId);
Assert.assertEquals(applicationId,
assertEquals(applicationId,
ApplicationId.fromString(applicationIdStr));
}
}

30
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/hadoop-yarn-server-timelineservice-hbase-common/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestKeyConverters.java
View File

@ -18,13 +18,14 @@
package org.apache.hadoop.yarn.server.timelineservice.storage.common;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import org.junit.jupiter.api.Test;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.junit.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
* Unit tests for key converters for various tables' row keys.
@ -33,7 +34,7 @@
public class TestKeyConverters {
@Test
public void testAppIdKeyConverter() {
void testAppIdKeyConverter() {
AppIdKeyConverter appIdKeyConverter = new AppIdKeyConverter();
long currentTs = System.currentTimeMillis();
ApplicationId appId1 = ApplicationId.newInstance(currentTs, 1);
@ -48,23 +49,20 @@ public void testAppIdKeyConverter() {
// App ids' should be encoded in a manner wherein descending order
// is maintained.
assertTrue(
"Ordering of app ids' is incorrect",
Bytes.compareTo(appIdBytes1, appIdBytes2) > 0
&& Bytes.compareTo(appIdBytes1, appIdBytes3) > 0
&& Bytes.compareTo(appIdBytes2, appIdBytes3) > 0);
&& Bytes.compareTo(appIdBytes2, appIdBytes3) > 0,
"Ordering of app ids' is incorrect");
String decodedAppId1 = appIdKeyConverter.decode(appIdBytes1);
String decodedAppId2 = appIdKeyConverter.decode(appIdBytes2);
String decodedAppId3 = appIdKeyConverter.decode(appIdBytes3);
assertTrue("Decoded app id is not same as the app id encoded",
appIdStr1.equals(decodedAppId1));
assertTrue("Decoded app id is not same as the app id encoded",
appIdStr2.equals(decodedAppId2));
assertTrue("Decoded app id is not same as the app id encoded",
appIdStr3.equals(decodedAppId3));
assertEquals(appIdStr1, decodedAppId1);
assertEquals(appIdStr2, decodedAppId2);
assertEquals(appIdStr3, decodedAppId3);
}
@Test
public void testEventColumnNameConverter() {
void testEventColumnNameConverter() {
String eventId = "=foo_=eve=nt=";
byte[] valSepBytes = Bytes.toBytes(Separator.VALUES.getValue());
byte[] maxByteArr =
@ -91,7 +89,7 @@ public void testEventColumnNameConverter() {
}
@Test
public void testLongKeyConverter() {
void testLongKeyConverter() {
LongKeyConverter longKeyConverter = new LongKeyConverter();
confirmLongKeyConverter(longKeyConverter, Long.MIN_VALUE);
confirmLongKeyConverter(longKeyConverter, -1234567890L);
@ -113,7 +111,7 @@ private void confirmLongKeyConverter(LongKeyConverter longKeyConverter,
}
@Test
public void testStringKeyConverter() {
void testStringKeyConverter() {
StringKeyConverter stringKeyConverter = new StringKeyConverter();
String phrase = "QuackAttack now!";

53
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/hadoop-yarn-server-timelineservice-hbase-common/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeys.java
View File

@ -17,8 +17,7 @@
*/
package org.apache.hadoop.yarn.server.timelineservice.storage.common;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import org.junit.jupiter.api.Test;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.yarn.api.records.ApplicationId;
@ -26,14 +25,16 @@
import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationRowKeyPrefix;
import org.apache.hadoop.yarn.server.timelineservice.storage.apptoflow.AppToFlowRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.domain.DomainRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.entity.EntityRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.entity.EntityRowKeyPrefix;
import org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowActivityRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowActivityRowKeyPrefix;
import org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.subapplication.SubApplicationRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.domain.DomainRowKey;
import org.junit.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
@ -81,14 +82,14 @@ private static void verifyRowPrefixBytes(byte[] byteRowKeyPrefix) {
int sepLen = QUALIFIER_SEP_BYTES.length;
for (int i = 0; i < sepLen; i++) {
assertTrue(
"Row key prefix not encoded properly.",
byteRowKeyPrefix[byteRowKeyPrefix.length - sepLen + i] ==
QUALIFIER_SEP_BYTES[i]);
QUALIFIER_SEP_BYTES[i],
"Row key prefix not encoded properly.");
}
}
@Test
public void testApplicationRowKey() {
void testApplicationRowKey() {
byte[] byteRowKey =
new ApplicationRowKey(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID,
APPLICATION_ID).getRowKey();
@ -104,7 +105,7 @@ public void testApplicationRowKey() {
.getRowKeyPrefix();
byte[][] splits =
Separator.QUALIFIERS.split(byteRowKeyPrefix,
new int[] {Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
new int[]{Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
Separator.VARIABLE_SIZE, Bytes.SIZEOF_LONG,
Separator.VARIABLE_SIZE});
assertEquals(5, splits.length);
@ -118,9 +119,9 @@ public void testApplicationRowKey() {
byteRowKeyPrefix =
new ApplicationRowKeyPrefix(CLUSTER, USER, FLOW_NAME).getRowKeyPrefix();
splits =
Separator.QUALIFIERS.split(byteRowKeyPrefix, new int[] {
Separator.QUALIFIERS.split(byteRowKeyPrefix, new int[]{
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE });
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE});
assertEquals(4, splits.length);
assertEquals(0, splits[3].length);
assertEquals(FLOW_NAME,
@ -133,14 +134,14 @@ public void testApplicationRowKey() {
* corresponding rowkey.
*/
@Test
public void testAppToFlowRowKey() {
void testAppToFlowRowKey() {
byte[] byteRowKey = new AppToFlowRowKey(APPLICATION_ID).getRowKey();
AppToFlowRowKey rowKey = AppToFlowRowKey.parseRowKey(byteRowKey);
assertEquals(APPLICATION_ID, rowKey.getAppId());
}
@Test
public void testEntityRowKey() {
void testEntityRowKey() {
TimelineEntity entity = new TimelineEntity();
entity.setId("!ent!ity!!id!");
entity.setType("entity!Type");
@ -163,14 +164,14 @@ public void testEntityRowKey() {
byte[] byteRowKeyPrefix =
new EntityRowKeyPrefix(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID,
APPLICATION_ID, entity.getType(), null, null)
.getRowKeyPrefix();
.getRowKeyPrefix();
byte[][] splits =
Separator.QUALIFIERS.split(
byteRowKeyPrefix,
new int[] {Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
new int[]{Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
Separator.VARIABLE_SIZE, Bytes.SIZEOF_LONG,
AppIdKeyConverter.getKeySize(), Separator.VARIABLE_SIZE,
Bytes.SIZEOF_LONG, Separator.VARIABLE_SIZE });
Bytes.SIZEOF_LONG, Separator.VARIABLE_SIZE});
assertEquals(7, splits.length);
assertEquals(APPLICATION_ID, new AppIdKeyConverter().decode(splits[4]));
assertEquals(entity.getType(),
@ -183,7 +184,7 @@ public void testEntityRowKey() {
splits =
Separator.QUALIFIERS.split(
byteRowKeyPrefix,
new int[] {Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
new int[]{Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
Separator.VARIABLE_SIZE, Bytes.SIZEOF_LONG,
AppIdKeyConverter.getKeySize(), Separator.VARIABLE_SIZE});
assertEquals(6, splits.length);
@ -194,7 +195,7 @@ public void testEntityRowKey() {
}
@Test
public void testFlowActivityRowKey() {
void testFlowActivityRowKey() {
Long ts = 1459900830000L;
Long dayTimestamp = HBaseTimelineSchemaUtils.getTopOfTheDayTimestamp(ts);
byte[] byteRowKey =
@ -208,8 +209,8 @@ public void testFlowActivityRowKey() {
byte[] byteRowKeyPrefix =
new FlowActivityRowKeyPrefix(CLUSTER).getRowKeyPrefix();
byte[][] splits =
Separator.QUALIFIERS.split(byteRowKeyPrefix, new int[] {
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE });
Separator.QUALIFIERS.split(byteRowKeyPrefix, new int[]{
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE});
assertEquals(2, splits.length);
assertEquals(0, splits[1].length);
assertEquals(CLUSTER,
@ -220,7 +221,7 @@ public void testFlowActivityRowKey() {
new FlowActivityRowKeyPrefix(CLUSTER, ts).getRowKeyPrefix();
splits =
Separator.QUALIFIERS.split(byteRowKeyPrefix,
new int[] {Separator.VARIABLE_SIZE, Bytes.SIZEOF_LONG,
new int[]{Separator.VARIABLE_SIZE, Bytes.SIZEOF_LONG,
Separator.VARIABLE_SIZE});
assertEquals(3, splits.length);
assertEquals(0, splits[2].length);
@ -232,7 +233,7 @@ public void testFlowActivityRowKey() {
}
@Test
public void testFlowRunRowKey() {
void testFlowRunRowKey() {
byte[] byteRowKey =
new FlowRunRowKey(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID).getRowKey();
FlowRunRowKey rowKey = FlowRunRowKey.parseRowKey(byteRowKey);
@ -244,9 +245,9 @@ public void testFlowRunRowKey() {
byte[] byteRowKeyPrefix =
new FlowRunRowKey(CLUSTER, USER, FLOW_NAME, null).getRowKey();
byte[][] splits =
Separator.QUALIFIERS.split(byteRowKeyPrefix, new int[] {
Separator.QUALIFIERS.split(byteRowKeyPrefix, new int[]{
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE,
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE });
Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE});
assertEquals(4, splits.length);
assertEquals(0, splits[3].length);
assertEquals(FLOW_NAME,
@ -255,7 +256,7 @@ public void testFlowRunRowKey() {
}
@Test
public void testSubAppRowKey() {
void testSubAppRowKey() {
TimelineEntity entity = new TimelineEntity();
entity.setId("entity1");
entity.setType("DAG");
@ -275,7 +276,7 @@ public void testSubAppRowKey() {
}
@Test
public void testDomainRowKey() {
void testDomainRowKey() {
String clusterId = "cluster1@dc1";
String domainId = "helloworld";
byte[] byteRowKey =
@ -291,7 +292,7 @@ public void testDomainRowKey() {
}
@Test
public void testDomainRowKeySpecialChars() {
void testDomainRowKeySpecialChars() {
String clusterId = "cluster1!temp!dc1";
String domainId = "hello=world";
byte[] byteRowKey =

35
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/hadoop-yarn-server-timelineservice-hbase-common/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeysAsString.java
View File

@ -17,7 +17,8 @@
*/
package org.apache.hadoop.yarn.server.timelineservice.storage.common;
import static org.junit.Assert.assertEquals;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity;
@ -27,7 +28,8 @@
import org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowActivityRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunRowKey;
import org.apache.hadoop.yarn.server.timelineservice.storage.subapplication.SubApplicationRowKey;
import org.junit.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* Test for row key as string.
@ -50,8 +52,9 @@ public class TestRowKeysAsString {
private final static String APPLICATION_ID =
ApplicationId.newInstance(System.currentTimeMillis(), 1).toString();
@Test(timeout = 10000)
public void testApplicationRow() {
@Test
@Timeout(10000)
void testApplicationRow() {
String rowKeyAsString = new ApplicationRowKey(CLUSTER, USER, FLOW_NAME,
FLOW_RUN_ID, APPLICATION_ID).getRowKeyAsString();
ApplicationRowKey rowKey =
@ -63,8 +66,9 @@ public void testApplicationRow() {
assertEquals(APPLICATION_ID, rowKey.getAppId());
}
@Test(timeout = 10000)
public void testEntityRowKey() {
@Test
@Timeout(10000)
void testEntityRowKey() {
char del = TimelineReaderUtils.DEFAULT_DELIMITER_CHAR;
char esc = TimelineReaderUtils.DEFAULT_ESCAPE_CHAR;
String id = del + esc + "ent" + esc + del + "ity" + esc + del + esc + "id"
@ -78,7 +82,7 @@ public void testEntityRowKey() {
String rowKeyAsString =
new EntityRowKey(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID, APPLICATION_ID,
entity.getType(), entity.getIdPrefix(), entity.getId())
.getRowKeyAsString();
.getRowKeyAsString();
EntityRowKey rowKey = EntityRowKey.parseRowKeyFromString(rowKeyAsString);
assertEquals(CLUSTER, rowKey.getClusterId());
assertEquals(USER, rowKey.getUserId());
@ -91,8 +95,9 @@ public void testEntityRowKey() {
}
@Test(timeout = 10000)
public void testFlowActivityRowKey() {
@Test
@Timeout(10000)
void testFlowActivityRowKey() {
Long ts = 1459900830000L;
Long dayTimestamp = HBaseTimelineSchemaUtils.getTopOfTheDayTimestamp(ts);
String rowKeyAsString = new FlowActivityRowKey(CLUSTER, ts, USER, FLOW_NAME)
@ -105,8 +110,9 @@ public void testFlowActivityRowKey() {
assertEquals(FLOW_NAME, rowKey.getFlowName());
}
@Test(timeout = 10000)
public void testFlowRunRowKey() {
@Test
@Timeout(10000)
void testFlowRunRowKey() {
String rowKeyAsString =
new FlowRunRowKey(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID)
.getRowKeyAsString();
@ -117,8 +123,9 @@ public void testFlowRunRowKey() {
assertEquals(FLOW_RUN_ID, rowKey.getFlowRunId());
}
@Test(timeout = 10000)
public void testSubApplicationRowKey() {
@Test
@Timeout(10000)
void testSubApplicationRowKey() {
char del = TimelineReaderUtils.DEFAULT_DELIMITER_CHAR;
char esc = TimelineReaderUtils.DEFAULT_ESCAPE_CHAR;
String id = del + esc + "ent" + esc + del + "ity" + esc + del + esc + "id"
@ -131,7 +138,7 @@ public void testSubApplicationRowKey() {
String rowKeyAsString = new SubApplicationRowKey(SUB_APP_USER, CLUSTER,
entity.getType(), entity.getIdPrefix(), entity.getId(), USER)
.getRowKeyAsString();
.getRowKeyAsString();
SubApplicationRowKey rowKey = SubApplicationRowKey
.parseRowKeyFromString(rowKeyAsString);
assertEquals(SUB_APP_USER, rowKey.getSubAppUserId());

37
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/hadoop-yarn-server-timelineservice-hbase-common/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestSeparator.java
View File

@ -16,19 +16,19 @@
*/
package org.apache.hadoop.yarn.server.timelineservice.storage.common;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;
import org.apache.hadoop.thirdparty.com.google.common.collect.Iterables;
import org.junit.jupiter.api.Test;
import org.apache.hadoop.hbase.util.Bytes;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;
public class TestSeparator {
@ -40,7 +40,7 @@ public class TestSeparator {
*
*/
@Test
public void testEncodeDecodeString() {
void testEncodeDecodeString() {
for (Separator separator : Separator.values()) {
testEncodeDecode(separator, "");
@ -65,11 +65,11 @@ private void testEncodeDecode(Separator separator, String token) {
String encoded = separator.encode(token);
String decoded = separator.decode(encoded);
String msg = "token:" + token + " separator:" + separator + ".";
assertEquals(msg, token, decoded);
assertEquals(token, decoded, msg);
}
@Test
public void testEncodeDecode() {
void testEncodeDecode() {
testEncodeDecode("Dr.", Separator.QUALIFIERS);
testEncodeDecode("Heinz", Separator.QUALIFIERS, Separator.QUALIFIERS);
testEncodeDecode("Doofenshmirtz", Separator.QUALIFIERS, null,
@ -81,15 +81,16 @@ public void testEncodeDecode() {
Separator.VALUES, Separator.SPACE);
}
@Test
public void testEncodedValues() {
void testEncodedValues() {
testEncodeDecode("Double-escape %2$ and %9$ or %%2$ or %%3$, nor %%%2$" +
"= no problem!",
Separator.QUALIFIERS, Separator.VALUES, Separator.SPACE, Separator.TAB);
}
@Test
public void testSplits() {
void testSplits() {
byte[] maxLongBytes = Bytes.toBytes(Long.MAX_VALUE);
byte[] maxIntBytes = Bytes.toBytes(Integer.MAX_VALUE);
for (Separator separator : Separator.values()) {
@ -128,7 +129,7 @@ public void testSplits() {
longVal1Arr = Bytes.add(sepByteArr, Bytes.copy(maxLongBytes,
sepByteArr.length, 4 - sepByteArr.length), sepByteArr);
longVal1Arr = Bytes.add(longVal1Arr, Bytes.copy(maxLongBytes, 4, 3 -
sepByteArr.length), sepByteArr);
sepByteArr.length), sepByteArr);
arr = separator.join(Bytes.toBytes(separator.encode(str1)), longVal1Arr,
Bytes.toBytes(separator.encode(str2)), intVal1Arr);
splits = separator.split(arr, sizes);
@ -154,14 +155,16 @@ public void testSplits() {
Bytes.SIZEOF_INT, 7};
splits = separator.split(arr, sizes2);
fail("Exception should have been thrown.");
} catch (IllegalArgumentException e) {}
} catch (IllegalArgumentException e) {
}
try {
int[] sizes2 = {Separator.VARIABLE_SIZE, Separator.VARIABLE_SIZE, 2,
Bytes.SIZEOF_LONG};
splits = separator.split(arr, sizes2);
fail("Exception should have been thrown.");
} catch (IllegalArgumentException e) {}
} catch (IllegalArgumentException e) {
}
}
}
@ -179,7 +182,7 @@ private static void testEncodeDecode(String token, Separator... separators) {
}
@Test
public void testJoinStripped() {
void testJoinStripped() {
List<String> stringList = new ArrayList<String>(0);
stringList.add("nothing");