Get authoritative profile keys from group changes only.

app/src/test/java/org/thoughtcrime/securesms/testutil/LogRecorder.java

@@ -1,5 +1,8 @@
 package org.thoughtcrime.securesms.testutil;
 
+import org.hamcrest.BaseMatcher;
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
 import org.thoughtcrime.securesms.logging.Log;
 
 import java.util.ArrayList;
@@ -95,4 +98,46 @@ public final class LogRecorder extends Log.Logger {
       return throwable;
     }
   }
+
+  @SafeVarargs
+  public static <T> Matcher<T> hasMessages(T... messages) {
+    return new BaseMatcher<T>() {
+
+      @Override
+      public void describeTo(Description description) {
+        description.appendValueList("[", ", ", "]", messages);
+      }
+
+      @Override
+      public void describeMismatch(Object item, Description description) {
+        @SuppressWarnings("unchecked")
+        List<Entry>       list     = (List<Entry>) item;
+        ArrayList<String> messages = new ArrayList<>(list.size());
+
+        for (Entry e : list) {
+          messages.add(e.message);
+        }
+
+        description.appendText("was ").appendValueList("[", ", ", "]", messages);
+      }
+
+      @Override
+      public boolean matches(Object item) {
+        @SuppressWarnings("unchecked")
+        List<Entry> list = (List<Entry>) item;
+
+        if (list.size() != messages.length) {
+          return false;
+        }
+
+        for (int i = 0; i < messages.length; i++) {
+          if (!list.get(i).message.equals(messages[i])) {
+            return false;
+          }
+        }
+
+        return true;
+      }
+    };
+  }
 }