diff --git a/api.d.ts b/api.d.ts
index 8d32e84..75de313 100644
--- a/api.d.ts
+++ b/api.d.ts
@@ -238,6 +238,11 @@ export interface STF_API {
              */
             env?: Object
 
+            /**
+             * A flags object override for testing with specific feature toggle setting.
+             */
+            flags?: Object
+
             /**
              * Definition of SAP Web IDE plugin transformation that happens BEFORE
              * any plugins are registered in the "pluginRegistry". This allows using mock
diff --git a/resources/local_env/webide_starter.js b/resources/local_env/webide_starter.js
index 62457ff..c40c3ac 100644
--- a/resources/local_env/webide_starter.js
+++ b/resources/local_env/webide_starter.js
@@ -91,6 +91,7 @@ var DEFAULT_START_WEBIDE_OPTIONS = {
   extra_url_params: {},
   backend: "IN_MEMORY",
   env: localEnvJson,
+  flags: {},
   featureConfig: DEFAULT_FEATURE_CONFIG
 }
 
@@ -223,7 +224,11 @@ function startWebIDE(options) {
     actualOptions.featureConfig
   )
 
-  iframe.contentWindow.WEB_IDE_ENV_JSON_OVERRIDE = actualOptions.env
+  iframe.contentWindow.WEB_IDE_ENV_JSON_OVERRIDE = _.assign(
+    {},
+    actualOptions.env,
+    { flags: actualOptions.flags }
+  )
 
   return deferred.promise.then(function(PluginRegistry) {
     return {
diff --git a/resources/tests/serviceTestFramework.js b/resources/tests/serviceTestFramework.js
index 2459960..08f2e6b 100644
--- a/resources/tests/serviceTestFramework.js
+++ b/resources/tests/serviceTestFramework.js
@@ -143,6 +143,7 @@ define("STF", [
     pluginsTransformDef: { add: [], remove: [] },
     mocks: [IN_MEMORY_BACKEND],
     env: localEnvJson,
+    flags: {},
     html: "/base/node_modules/webide/src/main/webapp/index.html",
     ui5Root:
       "https://sapui5.hana.ondemand.com/" + ui5Version.version + "/resources/",
@@ -257,7 +258,11 @@ define("STF", [
       )
       iframe.contentWindow.WEB_IDE_FEATURE_CONFIG_OVERRIDE =
         actualOptions.featureConfig
-      iframe.contentWindow.WEB_IDE_ENV_JSON_OVERRIDE = actualOptions.env
+      iframe.contentWindow.WEB_IDE_ENV_JSON_OVERRIDE = _.assign(
+        {},
+        actualOptions.env,
+        { flags: actualOptions.flags }
+      )
 
       return serviceRegistryDeferred.promise.then(function(PluginRegistry) {
         window.WEB_IDE_PLUGIN_REG[suiteName] = PluginRegistry