Start of unit tests for the actual API code

lib/api.dart

@@ -201,6 +201,8 @@ class InvenTreeAPI {
   // Authentication token (initially empty, must be requested)
   String _token = "";
 
+  bool get hasToken => _token.isNotEmpty;
+
   /*
    * Check server connection and display messages if not connected.
    * Useful as a precursor check before performing operations.
@@ -278,7 +280,7 @@ class InvenTreeAPI {
   bool _connecting = false;
 
   bool isConnected() {
-    return profile != null && _connected && baseUrl.isNotEmpty && _token.isNotEmpty;
+    return profile != null && _connected && baseUrl.isNotEmpty && hasToken;
   }
 
   bool isConnecting() {

lib/l10.dart

@@ -7,16 +7,18 @@ import "package:flutter/material.dart";
 // Shortcut function to reduce boilerplate!
 I18N L10()
 {
-  BuildContext? _ctx = OneContext().context;
+  if (OneContext.hasContext) {
+    BuildContext? _ctx = OneContext().context;
 
-  if (_ctx != null) {
-    I18N? i18n = I18N.of(_ctx);
+    if (_ctx != null) {
+      I18N? i18n = I18N.of(_ctx);
 
-    if (i18n != null) {
-      return i18n;
+      if (i18n != null) {
+        return i18n;
+      }
     }
   }
 
   // Fallback for "null" context
-   return I18NEn();
+  return I18NEn();
 }

lib/widget/snacks.dart

@@ -1,21 +1,19 @@
-
-/*
- * Display a snackbar with:
- *
- * a) Text on the left
- * b) Icon on the right
- *
- * | Text          <icon> |
- */
-
 import "package:flutter/material.dart";
 import "package:font_awesome_flutter/font_awesome_flutter.dart";
 import "package:one_context/one_context.dart";
 import "package:inventree/l10.dart";
 
 
+/*
+ * Display a configurable 'snackbar' at the bottom of the screen
+ */
 void showSnackIcon(String text, {IconData? icon, Function()? onAction, bool? success, String? actionText}) {
 
+  // Escape quickly if we do not have context
+  if (!OneContext.hasContext) {
+    return;
+  }
+
   BuildContext? context = OneContext().context;
 
   if (context != null) {