test: Added test for linked files

Adds tests for linked files, including error handling for cyclic
dependencies and missing files. Includes a fix to consider the
`useOnlyLangCode` flag.

Author: JavedNicolas

i18n/en-cyclic.json

@@ -0,0 +1,4 @@
+{
+  "test": "cyclic_test",
+  "cycle_start": ":/cycle_file1.json"
+}

i18n/en-cyclic/cycle_file1.json

@@ -0,0 +1,4 @@
+{
+  "file1_value": "This is file 1",
+  "link_to_file2": ":/cycle_file2.json"
+}

i18n/en-cyclic/cycle_file2.json

@@ -0,0 +1,4 @@
+{
+  "file2_value": "This is file 2",
+  "link_back_to_file1": ":/cycle_file1.json"
+}

i18n/en-linked.json

@@ -0,0 +1,19 @@
+{
+  "test": "test_linked_en",
+  "hello": "Hello",
+  "app": {
+    "name": "Test App",
+    "errors": ":/errors.json"
+  },
+  "validation": ":/validation.json",
+  "nested": {
+    "module": {
+      "messages": ":/nested/messages.json"
+    }
+  },
+  "multiple": {
+    "errors": ":/multi_errors.json",
+    "validation": ":/multi_validation.json"
+  },
+  "deep_nested": ":/deep/level1.json"
+}

i18n/en-linked/deep/level1.json

@@ -0,0 +1,4 @@
+{
+  "level1_value": "This is level 1",
+  "level2": ":/deep/level2.json"
+}

i18n/en-linked/deep/level2.json

@@ -0,0 +1,4 @@
+{
+  "level2_value": "This is level 2",
+  "final_message": "Deep nesting works!"
+}

i18n/en-linked/errors.json

@@ -0,0 +1,5 @@
+{
+  "not_found": "Resource not found",
+  "server_error": "Internal server error",
+  "invalid_input": "Invalid input provided"
+}

i18n/en-linked/multi_errors.json

@@ -0,0 +1,5 @@
+{
+  "not_found": "Multiple resource not found",
+  "server_error": "Multiple internal server error",
+  "invalid_input": "Multiple invalid input provided"
+}

i18n/en-linked/multi_validation.json

@@ -0,0 +1,6 @@
+{
+  "required": "Multiple field is required",
+  "email": "Multiple valid email address required",
+  "min_length": "Multiple minimum length is {min} characters",
+  "max_length": "Multiple maximum length is {max} characters"
+}

i18n/en-linked/nested/messages.json

@@ -0,0 +1,5 @@
+{
+  "welcome": "Welcome to our app",
+  "goodbye": "Thank you for using our app",
+  "info": "This is a nested message file"
+}