diff --git a/t/vsistdout.t b/t/vsistdout.t
index 02be848..8159f92 100644
--- a/t/vsistdout.t
+++ b/t/vsistdout.t
@@ -19,9 +19,10 @@ use JSON;
     sub write {
         my $line = shift;
         push @output, $line;
+        return 1;
     }
     sub close {
-        push @output, "end";
+        return 1;
     }
     sub output {
         my $output = join '', @output;
@@ -33,14 +34,17 @@ use JSON;
 # test vsistdout redirection
 if(1){
     # create a small layer and copy it to vsistdout with redirection
-    my $layer = GetDriver('Memory')->Create->CreateLayer({GeometryType => 'None'});
+    my $ds = GetDriver('Memory')->Create;
+    my $layer = $ds->CreateLayer({GeometryType => 'None'});
     $layer->CreateField(value => 'Integer');
     $layer->CreateGeomField(geom => 'Point');
-    my $feature = Geo::GDAL::FFI::Feature->new($layer->GetDefn);
-    $feature->SetField(value => 12);
-    $feature->SetGeomField(geom => [WKT => 'POINT(1 1)']);
-    $layer->CreateFeature($feature);
-
+    for my $i (1..2) {
+        my $feature = Geo::GDAL::FFI::Feature->new($layer->GetDefn);
+        $feature->SetField(value => 12);
+        $feature->SetGeomField(geom => [WKT => "POINT(1 $i)"]);
+        $layer->CreateFeature($feature);
+    }
+    $ds->FlushCache;
     my $output = Output->new;
     my $gdal = Geo::GDAL::FFI->get_instance;
     $gdal->SetWriter($output);
@@ -48,16 +52,16 @@ if(1){
     $gdal->CloseWriter;
 
     my $ret = $output->output;
-    ok($ret eq
-       '{"type": "FeatureCollection",'.
-       '"features": '.
-       '[{ "type": "Feature", "id": 0, "properties": '.
-       '{ "value": 12 }, "geometry": { "type": "Point", '.
-       '"coordinates": [ 1.0, 1.0 ] } }]}end', 
+    $ret = decode_json $ret;
+
+    my $exp = decode_json (get_expected_json_data());
+
+    is_deeply ($ret, $exp,
     "Redirect vsistdout to write/close methods of a class.");
 
 }
 
+
 # test Translate
 if(1){
     my $ds = GetDriver('GTiff')->Create('/vsimem/test.tiff', 10);
@@ -66,3 +70,38 @@ if(1){
 }
 
 done_testing();
+
+
+sub get_expected_json_data {
+    my $json = <<'EOJSON'
+{
+    "type": "FeatureCollection",
+    "features": [{
+            "type": "Feature",
+            "id": 0,
+            "properties": {
+                "value": 12
+            },
+            "geometry": {
+                "type": "Point",
+                "coordinates": [1.0, 1.0]
+            }
+        }, {
+            "type": "Feature",
+            "id": 1,
+            "properties": {
+                "value": 12
+            },
+            "geometry": {
+                "type": "Point",
+                "coordinates": [1.0, 2.0]
+            }
+        }
+    ]
+}
+EOJSON
+   ; 
+    return $json;
+}
+
+