Skip truncation test on ancient git versions

When the git changelow raw format is used there is no truncation,
don't test for truncation on old git versions.

Author: MarkEWaite

src/test/java/hudson/plugins/git/GitChangeSetTruncateTest.java

@@ -18,6 +18,8 @@
 
 import hudson.EnvVars;
 import hudson.model.TaskListener;
+import jenkins.plugins.git.CliGitCommand;
+import jenkins.plugins.git.GitSampleRepoRule;
 import org.jenkinsci.plugins.gitclient.Git;
 import org.jenkinsci.plugins.gitclient.GitClient;
 
@@ -37,6 +39,9 @@ public class GitChangeSetTruncateTest {
     @ClassRule
     public static TemporaryFolder tempFolder = new TemporaryFolder();
 
+    @ClassRule
+    public static GitSampleRepoRule versionCheckRepo = new GitSampleRepoRule();
+
     private static File repoRoot = null;
 
     private static final Random random = new Random();
@@ -96,9 +101,12 @@ public GitChangeSetTruncateTest(String gitImpl, String commitSummary, String exp
 
     @Parameterized.Parameters(name = "{0} \"{1}\" --->>> \"{2}\"")
     public static Collection gitObjects() {
-        String[] implementations = {"git", "jgit"};
+        /* If CLI git is older than 1.8.3, don't test CLI git message truncation */
+        /* CLI git 1.7.1 (CentOS 6) does not support the message truncation command line flags */
+        String[] bothGitImplementations = {"git", "jgit"};
+        String[] jgitImplementation = {"jgit"};
         List<Object[]> arguments = new ArrayList<>();
-        for (String implementation : implementations) {
+        for (String implementation : versionCheckRepo.gitVersionAtLeast(1, 8, 3) ? bothGitImplementations : jgitImplementation) {
             for (TestData sample : TEST_DATA) {
                 /* Expect truncated message from git, full message from JGit */
                 String expected = implementation.equals("git") ? sample.testDataExpectedSummary : sample.testDataCommitSummary;