test prerequisites: eradicate NOT_FOO

diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index 30d42cb3bfd856a7d920119f1c4226c408a8f82f..f2f55fc51ccd294194300d4bbf66307ac73f9ac6 100755 (executable)
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -230,7 +230,7 @@ test_expect_success '.gitattributes override config' '
 '
 
 test_expect_success 'setup: remove diff driver regex' '
-       test_might_fail git config --unset diff.testdriver.wordRegex
+       test_unconfig diff.testdriver.wordRegex
 '
 
 test_expect_success 'use configured regex' '
@@ -298,6 +298,7 @@ test_expect_success 'unset default driver' '
        test_unconfig diff.wordregex
 '
 
+test_language_driver ada
 test_language_driver bibtex
 test_language_driver cpp
 test_language_driver csharp
@@ -334,8 +335,7 @@ test_expect_success 'word-diff with diff.sbe' '
 
        c
        EOF
-       test_when_finished "git config --unset diff.suppress-blank-empty" &&
-       git config diff.suppress-blank-empty true &&
+       test_config diff.suppress-blank-empty true &&
        word_diff --word-diff=plain
 '
 
@@ -367,7 +367,7 @@ test_expect_success 'setup history with two files' '
 
 test_expect_success 'wordRegex for the first file does not apply to the second' '
        echo "*.tex diff=tex" >.gitattributes &&
-       git config diff.tex.wordRegex "[a-z]+|." &&
+       test_config diff.tex.wordRegex "[a-z]+|." &&
        cat >expect <<-\EOF &&
                diff --git a/a.tex b/a.tex
                --- a/a.tex