Looks like an interesting form of a merge conflict.

test/src/test/java/hudson/cli/CLIRegistererTest.java

@@ -3,7 +3,7 @@ package hudson.cli;
 import static hudson.cli.CLICommandInvoker.Matcher.failedWith;
 import static hudson.cli.CLICommandInvoker.Matcher.succeededSilently;
 import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.CoreMatchers.is;
 
 import jenkins.model.Jenkins;

test/src/test/java/hudson/cli/GroovyshCommandTest.java

@@ -27,7 +27,7 @@ package hudson.cli;
 import static hudson.cli.CLICommandInvoker.Matcher.*;
 import jenkins.model.Jenkins;
 import org.apache.tools.ant.filters.StringInputStream;
-import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.Matchers.containsString;
 import static org.junit.Assert.*;
 import org.junit.Rule;
 import org.junit.Test;

test/src/test/java/hudson/cli/HelpCommandTest.java

@@ -27,6 +27,7 @@ package hudson.cli;
 import static hudson.cli.CLICommandInvoker.Matcher.*;
 import static org.junit.Assert.*;
 import static org.hamcrest.CoreMatchers.*;
+import static org.hamcrest.Matchers.*;
 import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder;
 
 import java.io.PrintStream;