[test] fix AbstractJavaModelTests #1333

avoid asynchronous refresh. Implementation taken from
org.eclipse.core.tests.resources.refresh.RefreshProviderTest.joinAutoRefreshJobs()

#1333

org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/AbstractJavaModelTests.java

@@ -354,7 +354,7 @@ protected class DeltaListener implements IElementChangedListener, IResourceChang
  * <code>#startDeltas</code> and
  * <code>#stopDeltas</code>.
  */
- private IJavaElementDelta[] deltas;
+ private ArrayList<IJavaElementDelta> deltas = new ArrayList<>();
 
  private final int eventType;
 
@@ -373,10 +373,7 @@ public DeltaListener(int eventType) {
 
  public synchronized void elementChanged(ElementChangedEvent event) {
  if (this.eventType == -1 || event.getType() == this.eventType) {
- IJavaElementDelta[] copy= new IJavaElementDelta[this.deltas.length + 1];
- System.arraycopy(this.deltas, 0, copy, 0, this.deltas.length);
- copy[this.deltas.length]= event.getDelta();
- this.deltas= copy;
+ this.deltas.add(event.getDelta());
  StringBuilder message = new StringBuilder();
  Job currentJob = Job.getJobManager().currentJob();
  if (currentJob != null) {
@@ -389,8 +386,8 @@ public synchronized void elementChanged(ElementChangedEvent event) {
  }
  }
  public synchronized CompilationUnit getCompilationUnitAST(ICompilationUnit workingCopy) {
- for (int i=0, length= this.deltas.length; i<length; i++) {
- CompilationUnit result = getCompilationUnitAST(workingCopy, this.deltas[i]);
+ for (IJavaElementDelta delta: this.deltas) {
+ CompilationUnit result = getCompilationUnitAST(workingCopy,delta);
  if (result != null)
  return result;
  }
@@ -418,8 +415,8 @@ public synchronized IJavaElementDelta getDeltaFor(IJavaElement element, boolean
  if (this.deltas == null) waitForResourceDelta();
  if (this.deltas == null) return null;
  IJavaElementDelta result = null;
- for (int i = 0; i < this.deltas.length; i++) {
- IJavaElementDelta delta = searchForDelta(element, this.deltas[i]);
+ for (IJavaElementDelta delta1: this.deltas) {
+ IJavaElementDelta delta = searchForDelta(element, delta1);
  if (delta != null) {
  if (returnFirst) {
  return delta;
@@ -431,15 +428,15 @@ public synchronized IJavaElementDelta getDeltaFor(IJavaElement element, boolean
  }
 
  public synchronized IJavaElementDelta getLastDelta() {
- return this.deltas[this.deltas.length - 1];
+ return this.deltas.get(this.deltas.size()-1);
  }
 
  public synchronized List<IJavaElementDelta> getAllDeltas() {
- return List.of(this.deltas);
+ return this.deltas;
  }
 
  public synchronized void flush() {
- this.deltas = new IJavaElementDelta[0];
+ this.deltas.clear();
  this.stackTraces = new ByteArrayOutputStream();
  this.gotResourceDelta = false;
  }
@@ -512,8 +509,7 @@ public synchronized String stackTraces() {
  @Override
  public synchronized String toString() {
  StringBuilder buffer = new StringBuilder();
- for (int i = 0, length= this.deltas.length; i < length; i++) {
- IJavaElementDelta delta = this.deltas[i];
+ for (IJavaElementDelta delta: this.deltas) {
  if (((JavaElementDelta) delta).ignoreFromTests) {
  continue;
  }
@@ -1607,6 +1603,14 @@ public void clearDeltas(DeltaListener listener) {
  listener.flush();
  }
  public void clearDeltas() {
+ // We must join on the auto-refresh family because the workspace changes done in the
+ // tests may be batched and broadcasted by the RefreshJob, not the main thread.
+ Job.getJobManager().wakeUp(ResourcesPlugin.FAMILY_AUTO_REFRESH);
+ try {
+ Job.getJobManager().join(ResourcesPlugin.FAMILY_AUTO_REFRESH, null);
+ } catch (InterruptedException e) {
+ throw new RuntimeException(e);
+ }
  this.deltaListener.flush();
  }
  protected IJavaElement[] codeSelect(ISourceReference sourceReference, String selectAt, String selection) throws JavaModelException {