Format all tests.

tests/standalone/io/dependency_graph_test.dart

Index: tests/standalone/io/dependency_graph_test.dart
diff --git a/tests/standalone/io/dependency_graph_test.dart b/tests/standalone/io/dependency_graph_test.dart
index 495b9eafb62e4a5a0a0799eecbcfc4f50cb80c9e..13ce532068a64f8525bc599d3ab8d1de67a0a3ca 100644
--- a/tests/standalone/io/dependency_graph_test.dart
+++ b/tests/standalone/io/dependency_graph_test.dart
@@ -55,7 +55,7 @@ main() {
   changeState(node3, graph.NodeState.UnableToRun);
 
   dgraph.events.take(numberOfEvents).toList().then((events) {
-    for (var i=0; i<events.length; i++) {
+    for (var i = 0; i < events.length; i++) {
       eventAssertions[i](events[i]);
     }
   });