diff --git a/pom.xml b/pom.xml
index 29dff13..377129f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -136,7 +136,7 @@
         <dependency>
             <groupId>org.eclipse.jgit</groupId>
             <artifactId>org.eclipse.jgit</artifactId>
-            <version>5.5.1.201910021850-r</version>
+            <version>5.10.0.202012080955-r</version>
         </dependency>
         <!-- end git stuff -->
 
diff --git a/src/main/java/com/danielflower/restabuild/build/ProjectManager.java b/src/main/java/com/danielflower/restabuild/build/ProjectManager.java
index d023dd6..fa44d65 100644
--- a/src/main/java/com/danielflower/restabuild/build/ProjectManager.java
+++ b/src/main/java/com/danielflower/restabuild/build/ProjectManager.java
@@ -16,6 +16,7 @@
 import org.eclipse.jgit.lib.*;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.transport.FetchResult;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -96,12 +97,14 @@ static class ExtendedBuildState {
         public final String commitIDAfterBuild;
         public final List<String> tagsAdded;
         public final File workDir;
-        ExtendedBuildState(BuildState buildState, String commitIDBeforeBuild, String commitIDAfterBuild, List<String> tagsAdded, File workDir) {
+        public final String branch;
+        ExtendedBuildState(BuildState buildState, String commitIDBeforeBuild, String commitIDAfterBuild, List<String> tagsAdded, File workDir, String branch) {
             this.buildState = buildState;
             this.commitIDBeforeBuild = commitIDBeforeBuild;
             this.commitIDAfterBuild = commitIDAfterBuild;
             this.tagsAdded = tagsAdded;
             this.workDir = workDir;
+            this.branch = branch;
         }
     }
 
@@ -110,10 +113,11 @@ public ExtendedBuildState build(Writer outputHandler, String branch, String buil
         final File workDir;
         final ExtendedBuildState extendedBuildState;
         try (Git git = pullFromGitAndCopyWorkingCopyToNewDir(outputHandler, branch)) {
+            branch = git.getRepository().getBranch();
             workDir = git.getRepository().getWorkTree();
             doubleLog(outputHandler, "Created new instance in " + dirPath(workDir));
 
-            Ref headBefore = git.getRepository().exactRef("HEAD");
+            Ref headBefore = git.getRepository().exactRef(Constants.HEAD);
             Ref headAfter = headBefore;
             ObjectId beforeCommitID = headBefore.getObjectId();
             List<String> newTags = new ArrayList<>();
@@ -140,7 +144,7 @@ public ExtendedBuildState build(Writer outputHandler, String branch, String buil
                 ProcessStarter processStarter = new ProcessStarter(outputHandler);
                 result = processStarter.run(outputHandler, command, workDir, TimeUnit.MINUTES.toMillis(buildTimeout), environment);
 
-                headAfter = git.getRepository().exactRef("HEAD");
+                headAfter = git.getRepository().exactRef(Constants.HEAD);
 
                 try (RevWalk walk = new RevWalk(git.getRepository())) {
                     walk.markStart(walk.parseCommit(headAfter.getObjectId()));
@@ -154,7 +158,7 @@ public ExtendedBuildState build(Writer outputHandler, String branch, String buil
 
             newTags.removeAll(tagsBefore);
 
-            extendedBuildState = new ExtendedBuildState(result, beforeCommitID.name(), headAfter.getObjectId().name(), Collections.unmodifiableList(newTags), workDir);
+            extendedBuildState = new ExtendedBuildState(result, beforeCommitID.name(), headAfter.getObjectId().name(), Collections.unmodifiableList(newTags), workDir, branch);
         }
 
         deleteDirectoryQuietly(workDir, StandardDeleteOption.OVERRIDE_READ_ONLY);
@@ -169,10 +173,53 @@ public void close() {
     }
 
     private Git pullFromGitAndCopyWorkingCopyToNewDir(Writer writer, String branch) throws GitAPIException, IOException {
-        git.fetch().setRemote("origin").setProgressMonitor(new TextProgressMonitor(writer)).call();
+        FetchResult fetchResult = git.fetch().setRemote("origin").setProgressMonitor(new TextProgressMonitor(writer)).call();
+        if (branch == null) {
+            Ref ref = findBranchToBuild(fetchResult);
+            if (ref == null) {
+                throw new RuntimeException("Could not determine default branch to build");
+            } else {
+                branch = StringUtils.removeStart(ref.getName(), Constants.R_HEADS);
+            }
+            doubleLog(writer, "Building default branch: "+branch);
+        } else {
+            doubleLog(writer, "Building branch: "+branch);
+        }
         return copyToNewInstanceDirAndSwitchBranch(branch);
     }
 
+    private Ref findBranchToBuild(FetchResult result) {
+        final Ref headRef = result.getAdvertisedRef(Constants.HEAD);
+        if (headRef == null) {
+            return null;
+        }
+
+        if (headRef.isSymbolic()) {
+            return headRef.getTarget();
+        }
+
+        final ObjectId headObjectId = headRef.getObjectId();
+        if (headObjectId == null) {
+            return null;
+        }
+
+        final Ref masterRef = result.getAdvertisedRef(Constants.R_HEADS + Constants.MASTER);
+        if (masterRef != null && headObjectId.equals(masterRef.getObjectId())) {
+            return masterRef;
+        }
+
+        for (Ref adRef : result.getAdvertisedRefs()) {
+            if (!adRef.getName().startsWith(Constants.R_HEADS)) {
+                continue;
+            }
+            if (headObjectId.equals(adRef.getObjectId())) {
+                return adRef;
+            }
+        }
+
+        return null;
+    }
+
     private Git copyToNewInstanceDirAndSwitchBranch(String branch) throws GitAPIException, IOException {
         File dest = new File(instanceDir, String.valueOf(System.currentTimeMillis()));
         if (!dest.mkdir()) {
diff --git a/src/main/java/com/danielflower/restabuild/web/BuildResource.java b/src/main/java/com/danielflower/restabuild/web/BuildResource.java
index 051d15e..b29cda0 100644
--- a/src/main/java/com/danielflower/restabuild/web/BuildResource.java
+++ b/src/main/java/com/danielflower/restabuild/web/BuildResource.java
@@ -12,6 +12,7 @@
 import io.muserver.rest.ApiResponse;
 import io.muserver.rest.Description;
 import io.muserver.rest.ResponseHeader;
+import org.apache.commons.lang3.StringUtils;
 import org.json.JSONArray;
 import org.json.JSONObject;
 
@@ -51,7 +52,7 @@ public BuildResource(FileSandbox fileSandbox, BuildQueue buildQueue, BuildDataba
     @ApiResponse(code = "400", message = "No gitUrl form parameter was specified.", contentType = "text/plain")
     public Response create(@FormParam("gitUrl") @Description(value = "The URL of a git repo that includes a `build.sh` or `build.bat` file. " +
         "It can be any type of Git URL (e.g. SSH or HTTPS) that the server has permission for.", example = "https://github.com/3redronin/mu-server-sample.git") String gitUrl,
-                           @DefaultValue("master") @FormParam("branch") @Description(value = "The value of the git branch. This parameter is optional.") String branch,
+                           @FormParam("branch") @Description(value = "The value of the git branch. This parameter is optional.") String branch,
                            @FormParam("buildParam") @Description(value = "The parameter for the `build.sh` or `build.bat` file. This parameter is optional.") String buildParam,
                            @Context UriInfo uriInfo) {
         BuildResult result = createInternal(gitUrl, branch, buildParam, uriInfo);
@@ -69,11 +70,7 @@ private BuildResult createInternal(String gitUrl, String branch, String buildPar
             throw new BadRequestException("A form parameter named gitUrl must point to a valid git repo");
         }
 
-        String gitBranch = branch;
-        if(null == branch || branch.trim().isEmpty()) {
-            gitBranch = "master";
-        }
-
+        String gitBranch = StringUtils.trimToNull(branch);
         GitRepo gitRepo = new GitRepo(gitUrl, gitBranch);
         String id = UUID.randomUUID().toString().replace("-", "");
         Map<String, String> environment = getEnrichedEnvironment(id, uriInfo);
diff --git a/src/main/resources/web/index.html b/src/main/resources/web/index.html
index 7076bcf..f26b7de 100644
--- a/src/main/resources/web/index.html
+++ b/src/main/resources/web/index.html
@@ -44,7 +44,7 @@ <h2>Submit a build</h2>
     </label>
     <label>
         Git Branch:
-        <input type="text" id="branchBox" name="branch"  placeholder="master">
+        <input type="text" id="branchBox" name="branch"  placeholder="<default>">
     </label>
     <label>
         Build Parameters:
diff --git a/src/main/resources/web/restabuild.js b/src/main/resources/web/restabuild.js
index af68b23..5c0e2d4 100644
--- a/src/main/resources/web/restabuild.js
+++ b/src/main/resources/web/restabuild.js
@@ -21,8 +21,13 @@ document.addEventListener('DOMContentLoaded', function () {
         var value = urlBox.value;
         var branch = branchBox.value;
         var buildParam = buildParamBox.value;
-        cc.textContent = 'curl -LNs -F \'gitUrl=' + (value || 'git-url') + '\' '  + '-F \'branch=' + (branch || 'master') + '\' ' + '-F \'param=' + (buildParam || '') + '\' ' + form.action;
-        history.replaceState(null, null, value ? encodeURI(path) + '?url=' + encodeURIComponent(value) : encodeURI(path));
+        cc.textContent = 'curl -LNs -F \'gitUrl=' + (value || 'git-url') + '\' '  + (branch ? ('-F \'branch=' + branch + '\' ') : '') + (buildParam ? ('-F \'param=' + buildParam + '\' ') : '') + form.action;
+        var encodedQS = '';
+        if (value) encodedQS += "&url="+encodeURIComponent(value);
+        if (branch) encodedQS += "&branch="+encodeURIComponent(branch);
+        if (buildParam) encodedQS += "&param="+encodeURIComponent(buildParam);
+        if (encodedQS) encodedQS = "?"+encodedQS.slice(1);
+        history.replaceState(null, null, encodeURI(path) + encodedQS);
     };
     urlBox.addEventListener('input', update);
     branchBox.addEventListener('input', update);
diff --git a/src/test/java/com/danielflower/restabuild/build/ProjectManagerTest.java b/src/test/java/com/danielflower/restabuild/build/ProjectManagerTest.java
index 20ca323..7670995 100644
--- a/src/test/java/com/danielflower/restabuild/build/ProjectManagerTest.java
+++ b/src/test/java/com/danielflower/restabuild/build/ProjectManagerTest.java
@@ -3,6 +3,8 @@
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.output.StringBuilderWriter;
 import org.eclipse.jgit.api.errors.GitAPIException;
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
 import scaffolding.AppRepo;
 import scaffolding.TestConfig;
@@ -15,12 +17,23 @@
 import static org.hamcrest.CoreMatchers.*;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.hasSize;
 
 public class ProjectManagerTest {
 
-    private AppRepo appRepo = AppRepo.create("maven");
+    private AppRepo appRepo;
     private final int defaultTimeout = 30;
 
+    @Before
+    public void setUp() {
+        appRepo = AppRepo.create("maven");
+    }
+
+    @After
+    public void tearDown() {
+        appRepo.close();
+    }
+
     @Test
     public void canBuildProjectsAndPickUpChangesFromMasterBranch() throws Exception {
         StringBuilderWriter buildLog = new StringBuilderWriter();
@@ -29,17 +42,86 @@ public void canBuildProjectsAndPickUpChangesFromMasterBranch() throws Exception
         ProjectManager.ExtendedBuildState extendedBuildState = runner.build(buildLog, "master", null, defaultTimeout, System.getenv());
         assertThat(buildLog.toString(), extendedBuildState.buildState, is(BuildState.SUCCESS));
         assertThat(buildLog.toString(), containsString("BUILD SUCCESS"));
+        assertThat(extendedBuildState.branch, equalTo("master"));
         assertThat(extendedBuildState.tagsAdded, contains("my-maven-app-1.0.0"));
         assertThat("workDir does not still exist", extendedBuildState.workDir.exists(), is(false));
 
         breakTheProject(appRepo, "master");
 
         StringBuilderWriter badBuildLog = new StringBuilderWriter();
-        BuildState result2 = runner.build(badBuildLog, "master", null, defaultTimeout, System.getenv()).buildState;
-        assertThat(buildLog.toString(), result2, is(BuildState.FAILURE));
+        ProjectManager.ExtendedBuildState badExtendedBuildState = runner.build(badBuildLog, "master", null, defaultTimeout, System.getenv());
+        assertThat(badBuildLog.toString(), badExtendedBuildState.buildState, is(BuildState.FAILURE));
         assertThat(badBuildLog.toString(), containsString("The build could not read 1 project"));
+        assertThat(badExtendedBuildState.branch, equalTo("master"));
+        assertThat(badExtendedBuildState.tagsAdded, hasSize(0));
+        assertThat("workDir does not still exist", badExtendedBuildState.workDir.exists(), is(false));
+
+    }
+
+    @Test
+    public void canBuildProjectsUsingDefaultBranch() throws Exception {
+        StringBuilderWriter buildLog = new StringBuilderWriter();
+        ProjectManager runner = ProjectManager.create(appRepo.gitUrl(), TestConfig.testSandbox(), buildLog);
+        ProjectManager.ExtendedBuildState extendedBuildState = runner.build(buildLog, null, null, defaultTimeout, System.getenv());
+        assertThat(buildLog.toString(), extendedBuildState.buildState, is(BuildState.SUCCESS));
+        assertThat(buildLog.toString(), containsString("BUILD SUCCESS"));
+        assertThat(extendedBuildState.branch, equalTo("master"));
+        assertThat(extendedBuildState.tagsAdded, contains("my-maven-app-1.0.0"));
         assertThat("workDir does not still exist", extendedBuildState.workDir.exists(), is(false));
 
+        breakTheProject(appRepo, "master");
+        StringBuilderWriter badBuildLog = new StringBuilderWriter();
+        ProjectManager.ExtendedBuildState badExtendedBuildState = runner.build(badBuildLog, null, null, defaultTimeout, System.getenv());
+        assertThat(badBuildLog.toString(), badExtendedBuildState.buildState, is(BuildState.FAILURE));
+        assertThat(badBuildLog.toString(), containsString("The build could not read 1 project"));
+        assertThat(badExtendedBuildState.branch, equalTo("master"));
+        assertThat(badExtendedBuildState.tagsAdded, hasSize(0));
+        assertThat("workDir does not still exist", badExtendedBuildState.workDir.exists(), is(false));
+    }
+
+    @Test
+    public void canBuildProjectsWithADefaultBranchNotCalledMaster() throws Exception {
+        appRepo.origin.checkout().setName("branch-1").call();
+
+        StringBuilderWriter buildLog = new StringBuilderWriter();
+        ProjectManager runner = ProjectManager.create(appRepo.gitUrl(), TestConfig.testSandbox(), buildLog);
+        ProjectManager.ExtendedBuildState extendedBuildState = runner.build(buildLog, null, null, defaultTimeout, System.getenv());
+        assertThat(buildLog.toString(), extendedBuildState.buildState, is(BuildState.SUCCESS));
+        assertThat(buildLog.toString(), containsString("BUILD SUCCESS"));
+        assertThat(extendedBuildState.branch, equalTo("branch-1"));
+        assertThat(extendedBuildState.tagsAdded, contains("my-maven-app-1.0.0"));
+        assertThat("workDir does not still exist", extendedBuildState.workDir.exists(), is(false));
+
+        breakTheProject(appRepo, "branch-1");
+        StringBuilderWriter badBuildLog = new StringBuilderWriter();
+        ProjectManager.ExtendedBuildState badExtendedBuildState = runner.build(badBuildLog, null, null, defaultTimeout, System.getenv());
+        assertThat(badBuildLog.toString(), badExtendedBuildState.buildState, is(BuildState.FAILURE));
+        assertThat(badBuildLog.toString(), containsString("The build could not read 1 project"));
+        assertThat(badExtendedBuildState.branch, equalTo("branch-1"));
+        assertThat(badExtendedBuildState.tagsAdded, hasSize(0));
+        assertThat("workDir does not still exist", badExtendedBuildState.workDir.exists(), is(false));
+    }
+
+    @Test
+    public void canBuildProjectsUsingChangingDefaultBranch() throws Exception {
+        StringBuilderWriter buildLog = new StringBuilderWriter();
+        ProjectManager runner = ProjectManager.create(appRepo.gitUrl(), TestConfig.testSandbox(), buildLog);
+        ProjectManager.ExtendedBuildState extendedBuildState = runner.build(buildLog, null, null, defaultTimeout, System.getenv());
+        assertThat(buildLog.toString(), extendedBuildState.buildState, is(BuildState.SUCCESS));
+        assertThat(buildLog.toString(), containsString("BUILD SUCCESS"));
+        assertThat(extendedBuildState.branch, equalTo("master"));
+        assertThat(extendedBuildState.tagsAdded, contains("my-maven-app-1.0.0"));
+        assertThat("workDir does not still exist", extendedBuildState.workDir.exists(), is(false));
+
+
+        appRepo.origin.checkout().setName("branch-1").call();
+        StringBuilderWriter buildLog2 = new StringBuilderWriter();
+        ProjectManager.ExtendedBuildState extendedBuildState2 = runner.build(buildLog2, null, null, defaultTimeout, System.getenv());
+        assertThat(buildLog2.toString(), extendedBuildState2.buildState, is(BuildState.SUCCESS));
+        assertThat(buildLog2.toString(), containsString("BUILD SUCCESS"));
+        assertThat(extendedBuildState2.branch, equalTo("branch-1"));
+        assertThat(extendedBuildState2.tagsAdded, contains("my-maven-app-1.0.1"));
+        assertThat("workDir does not still exist", extendedBuildState2.workDir.exists(), is(false));
     }
 
     @Test
@@ -54,6 +136,7 @@ public void tagsCanBePickedUpEvenForBuildsWithCommitsInThem() throws Exception {
         ProjectManager.ExtendedBuildState extendedBuildState = runner.build(buildLog, "master", null, defaultTimeout, System.getenv());
 
         String log = buildLog.toString();
+        assertThat(log, extendedBuildState.branch, equalTo("master"));
         assertThat(log, extendedBuildState.buildState, is(BuildState.SUCCESS));
         assertThat(log, extendedBuildState.commitIDBeforeBuild, is(commitIDAtStart));
         assertThat(log, extendedBuildState.commitIDAfterBuild, not(equalTo(commitIDAtStart)));
@@ -68,17 +151,18 @@ public void canBuildProjectsAndPickUpChangesFromAnyExistingBranch() throws Excep
         StringBuilderWriter buildLog = new StringBuilderWriter();
         ProjectManager runner = ProjectManager.create(appRepo.gitUrl(), TestConfig.testSandbox(), buildLog);
 
-        BuildState result = runner.build(buildLog, "branch-1", null, defaultTimeout, System.getenv()).buildState;
-        assertThat(buildLog.toString(), result, is(BuildState.SUCCESS));
+        ProjectManager.ExtendedBuildState extendedBuildState = runner.build(buildLog, "branch-1", null, defaultTimeout, System.getenv());
+        assertThat(buildLog.toString(), extendedBuildState.buildState, is(BuildState.SUCCESS));
         assertThat(buildLog.toString(), containsString("BUILD SUCCESS"));
+        assertThat(extendedBuildState.branch, equalTo("branch-1"));
 
         breakTheProject(appRepo, "branch-1");
 
         StringBuilderWriter badBuildLog = new StringBuilderWriter();
-        BuildState result2 = runner.build(badBuildLog, "branch-1", null, defaultTimeout, System.getenv()).buildState;
-        assertThat(buildLog.toString(), result2, is(BuildState.FAILURE));
+        ProjectManager.ExtendedBuildState badExtendedBuildState = runner.build(badBuildLog, "branch-1", null, defaultTimeout, System.getenv());
+        assertThat(badBuildLog.toString(), badExtendedBuildState.buildState, is(BuildState.FAILURE));
         assertThat(badBuildLog.toString(), containsString("The build could not read 1 project"));
-
+        assertThat(badExtendedBuildState.branch, equalTo("branch-1"));
     }
 
 
@@ -87,28 +171,32 @@ public void canBuildProjectsAndSwitchFromBranch() throws Exception {
         StringBuilderWriter buildLog = new StringBuilderWriter();
         ProjectManager runner = ProjectManager.create(appRepo.gitUrl(), TestConfig.testSandbox(), buildLog);
 
-        BuildState result = runner.build(buildLog, "master", null, defaultTimeout, System.getenv()).buildState;
-        assertThat(buildLog.toString(), result, is(BuildState.SUCCESS));
+        ProjectManager.ExtendedBuildState masterExtendedBuildState = runner.build(buildLog, "master", null, defaultTimeout, System.getenv());
+        assertThat(buildLog.toString(), masterExtendedBuildState.buildState, is(BuildState.SUCCESS));
         assertThat(buildLog.toString(), containsString("BUILD SUCCESS"));
+        assertThat(buildLog.toString(), masterExtendedBuildState.branch, equalTo("master"));
 
 
         StringBuilderWriter buildLogBranch1 = new StringBuilderWriter();
-        result = runner.build(buildLogBranch1, "branch-1", null, defaultTimeout, System.getenv()).buildState;
-        assertThat(buildLogBranch1.toString(), result, is(BuildState.SUCCESS));
+        ProjectManager.ExtendedBuildState branch1ExtendedBuildState = runner.build(buildLogBranch1, "branch-1", null, defaultTimeout, System.getenv());
+        assertThat(buildLogBranch1.toString(), branch1ExtendedBuildState.buildState, is(BuildState.SUCCESS));
         assertThat(buildLogBranch1.toString(), containsString("BUILD SUCCESS"));
+        assertThat(buildLogBranch1.toString(), branch1ExtendedBuildState.branch, equalTo("branch-1"));
 
         breakTheProject(appRepo, "branch-1");
 
         StringBuilderWriter buildLogMasterAgain = new StringBuilderWriter();
-        BuildState result2 = runner.build(buildLogMasterAgain, "master", null, defaultTimeout, System.getenv()).buildState;
-        assertThat(buildLogMasterAgain.toString(), result2, is(BuildState.SUCCESS));
+        ProjectManager.ExtendedBuildState masterExtendedBuildState2 = runner.build(buildLogMasterAgain, "master", null, defaultTimeout, System.getenv());
+        assertThat(buildLogMasterAgain.toString(), masterExtendedBuildState2.buildState, is(BuildState.SUCCESS));
         assertThat(buildLogMasterAgain.toString(),  containsString("BUILD SUCCESS"));
+        assertThat(buildLogMasterAgain.toString(), masterExtendedBuildState2.branch, equalTo("master"));
 
 
         StringBuilderWriter buildLogBranch1Again = new StringBuilderWriter();
-        BuildState branch1AgainResult = runner.build(buildLogBranch1Again, "branch-1", null, defaultTimeout, System.getenv()).buildState;
-        assertThat(buildLogBranch1Again.toString(), branch1AgainResult, is(BuildState.FAILURE));
+        ProjectManager.ExtendedBuildState branch1ExtendedBuildState2 = runner.build(buildLogBranch1Again, "branch-1", null, defaultTimeout, System.getenv());
+        assertThat(buildLogBranch1Again.toString(), branch1ExtendedBuildState2.buildState, is(BuildState.FAILURE));
         assertThat(buildLogBranch1Again.toString(),  containsString("The build could not read 1 project"));
+        assertThat(buildLogBranch1Again.toString(), branch1ExtendedBuildState2.branch, equalTo("branch-1"));
     }
 
     @Test
diff --git a/src/test/java/scaffolding/AppRepo.java b/src/test/java/scaffolding/AppRepo.java
index 95c1991..df2ed34 100644
--- a/src/test/java/scaffolding/AppRepo.java
+++ b/src/test/java/scaffolding/AppRepo.java
@@ -4,6 +4,7 @@
 import org.eclipse.jgit.api.InitCommand;
 
 import java.io.File;
+import java.nio.file.Files;
 
 import static scaffolding.Photocopier.copySampleAppToTempDir;
 
@@ -16,6 +17,7 @@ public static AppRepo create(String name) {
             InitCommand initCommand = Git.init();
             initCommand.setDirectory(originDir);
             Git origin = initCommand.call();
+            String defaultBranch = origin.getRepository().getBranch();
 
             origin.add().addFilepattern(".").call();
             origin.commit().setMessage("Initial commit").call();
@@ -25,6 +27,13 @@ public static AppRepo create(String name) {
             origin.branchCreate().setName("branch-3").call();
             origin.branchCreate().setName("branch-4").call();
 
+            // Create new new branch that is ahead of the default but has no build scripts so a build would fail
+            origin.branchCreate().setName("ahead").call();
+            Files.deleteIfExists(new File(originDir, "build.sh").toPath());
+            Files.deleteIfExists(new File(originDir, "build.bat").toPath());
+            origin.commit().setMessage("Second commit").call();
+
+            origin.checkout().setName(defaultBranch).call();
 
             return new AppRepo(name, originDir, origin);
         } catch (Exception e) {
@@ -45,4 +54,8 @@ private AppRepo(String name, File originDir, Git origin) {
     public String gitUrl() {
         return originDir.toURI().toString();
     }
+
+    public void close() {
+        origin.close();
+    }
 }