Improve checks for API user permissions

.github/workflows/ci.yaml

@@ -60,6 +60,7 @@ jobs:
           invoke import-fixtures
           invoke server -a 127.0.0.1:12345 &
           invoke wait
+          sleep 30
       - name: Unit Tests
         run: |
           flutter test --coverage

lib/api.dart

@@ -497,7 +497,7 @@ class InvenTreeAPI {
   /*
    * Request the user roles (permissions) from the InvenTree server
    */
-  Future<void> getUserRoles() async {
+  Future<bool> getUserRoles() async {
 
     roles.clear();
 
@@ -511,7 +511,7 @@ class InvenTreeAPI {
     final response = await get(_URL_GET_ROLES, expectedStatusCode: 200);
 
     if (!response.successful()) {
-      return;
+      return false;
     }
 
     var data = response.asMap();
@@ -519,6 +519,10 @@ class InvenTreeAPI {
     if (data.containsKey("roles")) {
       // Save a local copy of the user roles
       roles = (response.data["roles"] ?? {}) as Map<String, dynamic>;
+
+      return true;
+    } else {
+      return false;
     }
   }
 

test/api_test.dart

@@ -129,10 +129,13 @@ void main() {
       assert(api.supportsNotifications);
       assert(api.supportsPoReceive);
 
+      // Ensure we can request (and receive) user roles
+      assert(await api.getUserRoles());
+
       // Check available permissions
       assert(api.checkPermission("part", "change"));
       assert(api.checkPermission("stocklocation", "delete"));
-      assert(api.checkPermission("part", "weirdpermission"));
+      assert(!api.checkPermission("part", "weirdpermission"));
       assert(api.checkPermission("blah", "bloo"));
     });