add nls_test()

tests/bash_tests/testcases.py

@@ -860,6 +860,40 @@ set Exif.Photo.DateTimeDigitized 2020:05:26 07:31:42
         BT.reportTest('modify-test', out)
 
 
+    def nls_test(self):
+        # Test driver for exiv2.exe nls support
+        nls          = BT.Executer('exiv2 -vVg nls').stdout.split('\n')[1]
+        platform     = BT.Executer('exiv2 -vVg platform').stdout.split('\n')[1]
+
+        if nls      != 'enable_nls=1':
+            print('Skipped. Because exiv2 is not built with nls.')
+            return
+        if platform == 'platform=windows':
+            print('Skipped. Because nls_test cannot be run msvc builds.')
+            return
+        
+        # variable LANG is unused
+        # if platform == 'platform=linux':
+        #     LANG = 'LANGUAGE'
+        # else:
+        #     LANG = 'LANG'
+
+        share_dir    = os.path.normpath(os.path.join(BT.Config.bin_dir, '..', 'share2'))
+        os.makedirs(share_dir, exist_ok=True)
+
+        locale_dir   = '/usr/local/share/locale'
+        if os.path.isdir(locale_dir) and os.path.isdir(share_dir):
+            BT.cp(locale_dir, share_dir)
+        else:
+            print('Skipped. Because localisation files are not installed in {}.'.format(locale_dir))
+
+        # The above part is checking the environment, and the following part is executing the actual test
+        out      = BT.Output()
+        for language in ['fr_FR', 'es_ES']:
+            out += BT.Executer('exiv2', extra_env={'LC_ALL': language, 'LANG': language}, assert_returncode=[1])
+        BT.reportTest('nls-test', out)
+
+
     def path_test(self):
         # Mini test-driver for path utility functions
         BT.copyTestFile('path-test.txt')