Unregister postrender listener in tests

test/spec/ol/interaction/dragzoominteraction.test.js

@@ -27,7 +27,7 @@ describe('ol.interaction.DragZoom', function() {
         resolution: 1
       })
     });
-    map.on('postrender', function() {
+    map.once('postrender', function() {
       done();
     });
   });

test/spec/ol/interaction/drawinteraction.test.js

@@ -26,7 +26,7 @@ describe('ol.interaction.Draw', function() {
         resolution: 1
       })
     });
-    map.on('postrender', function() {
+    map.once('postrender', function() {
       done();
     });
   });

test/spec/ol/interaction/modifyinteraction.test.js

@@ -42,7 +42,7 @@ describe('ol.interaction.Modify', function() {
       })
     });
 
-    map.on('postrender', function() {
+    map.once('postrender', function() {
       done();
     });
   });

test/spec/ol/interaction/selectinteraction.test.js

@@ -57,7 +57,7 @@ describe('ol.interaction.Select', function() {
       })
     });
 
-    map.on('postrender', function() {
+    map.once('postrender', function() {
       done();
     });
   });

test/spec/ol/interaction/snapinteraction.test.js

@@ -37,7 +37,7 @@ describe('ol.interaction.Snap', function() {
         })
       });
 
-      map.on('postrender', function() {
+      map.once('postrender', function() {
         done();
       });
     });

test/spec/ol/interaction/translateinteraction.test.js

@@ -32,7 +32,7 @@ describe('ol.interaction.Translate', function() {
         resolution: 1
             })
     });
-    map.on('postrender', function() {
+    map.once('postrender', function() {
       done();
     });
   });