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diff --git a/t/t0070-fundamental.sh b/t/t0070-fundamental.sh
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+#!/bin/sh
+
+test_description='check that the most basic functions work
+
+
+Verify wrappers and compatibility functions.
+'
+
+. ./test-lib.sh
+
+test_expect_success 'character classes (isspace, isalpha etc.)' '
+ test-ctype
+'
+
+test_expect_success 'mktemp to nonexistent directory prints filename' '
+ test_must_fail test-mktemp doesnotexist/testXXXXXX 2>err &&
+ grep "doesnotexist/test" err
+'
+
+test_expect_success POSIXPERM 'mktemp to unwritable directory prints filename' '
+ mkdir cannotwrite &&
+ chmod -w cannotwrite &&
+ test_when_finished "chmod +w cannotwrite" &&
+ test_must_fail test-mktemp cannotwrite/testXXXXXX 2>err &&
+ grep "cannotwrite/test" err
+'
+
+test_done