HBASE-26838 Junit jar is not included in the hbase tar ball, causing … (#4223)

Signed-off-by: Josh Elser <elserj@apache.org>
Singed-off-by: Nick Dimiduk <ndimiduk@apache.org>
Reviewed-by: Sean Busbey <busbey@apache.org>

bin/hbase

@@ -757,6 +757,13 @@ elif [ "$COMMAND" = "hbtop" ] ; then
   HBASE_OPTS="${HBASE_OPTS} ${HBASE_HBTOP_OPTS}"
 else
   CLASS=$COMMAND
+if [[ "$CLASS" =~ .*IntegrationTest.* ]] ; then
+    for f in ${HBASE_HOME}/lib/test/*.jar; do
+      if [ -f "${f}" ]; then
+        CLASSPATH="${CLASSPATH}:${f}"
+      fi
+    done
+  fi
 fi
 
 # Add lib/jdk11 jars to the classpath

hbase-assembly/pom.xml

@@ -374,5 +374,16 @@
       <artifactId>opentelemetry-javaagent</artifactId>
       <classifier>all</classifier>
     </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <!-- Making it compile here so that it can be downloaded during packaging. -->
+      <!-- All other modules scope it as test or inherit test scope from parent pom.  -->
+      <scope>compile</scope>
+    </dependency>
   </dependencies>
 </project>

hbase-assembly/src/main/assembly/client.xml

@@ -52,6 +52,7 @@
               <exclude>com.sun.jersey:*</exclude>
               <exclude>com.sun.jersey.contribs:*</exclude>
               <exclude>jline:jline</exclude>
+              <exclude>junit:junit</exclude>
               <exclude>com.github.stephenc.findbugs:findbugs-annotations</exclude>
               <exclude>commons-logging:commons-logging</exclude>
               <exclude>log4j:log4j</exclude>
@@ -64,6 +65,8 @@
               <exclude>org.slf4j:*</exclude>
               <exclude>org.apache.logging.log4j:*</exclude>
               <exclude>io.opentelemetry.javaagent:*</exclude>
+              <exclude>org.hamcrest:hamcrest-core</exclude>
+              <exclude>org.mockito:mockito-core</exclude>
             </excludes>
           </dependencySet>
         </dependencySets>
@@ -159,6 +162,15 @@
         <include>io.opentelemetry.javaagent:*</include>
       </includes>
     </dependencySet>
+    <!-- Adds junit libs to lib/test -->
+    <dependencySet>
+      <outputDirectory>lib/test</outputDirectory>
+      <includes>
+        <include>junit:junit</include>
+        <include>org.hamcrest:hamcrest-core</include>
+        <include>org.mockito:mockito-core</include>
+      </includes>
+    </dependencySet>
   </dependencySets>
 
 </assembly>

hbase-assembly/src/main/assembly/hadoop-three-compat.xml

@@ -112,6 +112,9 @@
               <exclude>org.slf4j:*</exclude>
               <exclude>org.apache.logging.log4j:*</exclude>
               <exclude>io.opentelemetry.javaagent:*</exclude>
+              <exclude>junit:junit</exclude>
+              <exclude>org.hamcrest:hamcrest-core</exclude>
+              <exclude>org.mockito:mockito-core</exclude>
             </excludes>
           </dependencySet>
         </dependencySets>
@@ -261,6 +264,16 @@
         <include>io.opentelemetry.javaagent:*</include>
       </includes>
     </dependencySet>
+
+    <!-- Adds junit libs to lib/test -->
+    <dependencySet>
+      <outputDirectory>lib/test</outputDirectory>
+      <includes>
+        <include>junit:junit</include>
+        <include>org.hamcrest:hamcrest-core</include>
+        <include>org.mockito:mockito-core</include>
+      </includes>
+    </dependencySet>
   </dependencySets>
 
 </assembly>

src/main/asciidoc/_chapters/developer.adoc

@@ -1575,7 +1575,7 @@ They are generally long-lasting, sizeable (the test can be asked to 1M rows or 1
 Integration tests are what you would run when you need to more elaborate proofing of a release candidate beyond what unit tests can do.
 They are not generally run on the Apache Continuous Integration build server, however, some sites opt to run integration tests as a part of their continuous testing on an actual cluster.
 
-Integration tests currently live under the _src/test_                directory in the hbase-it submodule and will match the regex: _**/IntegrationTest*.java_.
+Integration tests currently live under the _src/test_ directory in the hbase-it submodule and will match the regex: _*IntegrationTest*.java_.
 All integration tests are also annotated with `@Category(IntegrationTests.class)`.
 
 Integration tests can be run in two modes: using a mini cluster, or against an actual distributed cluster.
@@ -1692,6 +1692,17 @@ Currently tarball deployments, deployments which uses _hbase-daemons.sh_, and li
 _/etc/init.d/_ scripts are not supported for now, but it can be easily added.
 For other deployment options, a ClusterManager can be implemented and plugged in.
 
+Some integration tests define a _main_ method as entry point, and can be run on its' own, rather than using the test driver. For example, the _itbll_ test can be run as follows:
+
+----
+bin/hbase org.apache.hadoop.hbase.test.IntegrationTestBigLinkedList loop 2 1 100000 /temp 1 1000 50 1 0
+----
+
+NOTE: The _hbase_ script assumes all integration tests with exposed _main_ methods to be run
+against a distributed cluster will follow the *IntegrationTest* regex naming pattern
+mentioned above, in order to proper set test dependencies into the classpath.
+
+
 [[maven.build.commands.integration.tests.destructive]]
 ==== Destructive integration / system tests (ChaosMonkey)