t: stop announcing prereqs

We have a couple of cases where our tests end up announcing that a
certain prerequisite is or isn't fulfilled. While this is supposed to
help the developer it has the downside that it breaks the TAP format.

We could convert these cases to just have a "#" prefix, but it feels
rather unlikely that these are generally useful in the first place. We
already do announce why a specific test is being skipped, so we should
try to use this mechanism to the best extent possible.

Stop announcing these prereqs to fix the TAP format. Where possible,
convert the tests to rely on the prerequisites themselves to announce
why a test ran or didn't ran.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0050-filesystem.sh

@@ -10,53 +10,35 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 auml=$(printf '\303\244')
 aumlcdiar=$(printf '\141\314\210')
 
-if test_have_prereq CASE_INSENSITIVE_FS
-then
-	say "will test on a case insensitive filesystem"
-	test_case=test_expect_failure
-else
-	test_case=test_expect_success
-fi
-
 if test_have_prereq UTF8_NFD_TO_NFC
 then
-	say "will test on a unicode corrupting filesystem"
 	test_unicode=test_expect_failure
 else
 	test_unicode=test_expect_success
 fi
 
-test_have_prereq SYMLINKS ||
-	say "will test on a filesystem lacking symbolic links"
-
-if test_have_prereq CASE_INSENSITIVE_FS
-then
-test_expect_success "detection of case insensitive filesystem during repo init" '
+test_expect_success CASE_INSENSITIVE_FS "detection of case insensitive filesystem during repo init" '
 	test $(git config --bool core.ignorecase) = true
 '
-else
-test_expect_success "detection of case insensitive filesystem during repo init" '
+
+test_expect_success !CASE_INSENSITIVE_FS "detection of case insensitive filesystem during repo init" '
 	{
 		test_must_fail git config --bool core.ignorecase >/dev/null ||
 			test $(git config --bool core.ignorecase) = false
 	}
 '
-fi
 
-if test_have_prereq SYMLINKS
-then
-test_expect_success "detection of filesystem w/o symlink support during repo init" '
+test_expect_success SYMLINKS "detection of filesystem w/o symlink support during repo init" '
 	{
 		test_must_fail git config --bool core.symlinks ||
 		test "$(git config --bool core.symlinks)" = true
 	}
 '
-else
-test_expect_success "detection of filesystem w/o symlink support during repo init" '
+
+test_expect_success !SYMLINKS "detection of filesystem w/o symlink support during repo init" '
 	v=$(git config --bool core.symlinks) &&
 	test "$v" = false
 '
-fi
 
 test_expect_success "setup case tests" '
 	git config core.ignorecase true &&

t/t3600-rm.sh

@@ -17,11 +17,6 @@ test_expect_success 'Initialize test directory' '
 	git commit -m "add normal files"
 '
 
-if test_have_prereq !FUNNYNAMES
-then
-	say 'Your filesystem does not allow tabs in filenames.'
-fi
-
 test_expect_success FUNNYNAMES 'add files with funny names' '
 	touch -- "tab	embedded" "newline${LF}embedded" &&
 	git add -- "tab	embedded" "newline${LF}embedded" &&

t/t4000-diff-format.sh

@@ -36,7 +36,7 @@ test_expect_success 'git diff-files -p after editing work tree.' '
 # that's as far as it comes
 if [ "$(git config --get core.filemode)" = false ]
 then
-	say 'filemode disabled on the filesystem'
+	skip_all='filemode disabled on the filesystem'
 	test_done
 fi
 

t/t9500-gitweb-standalone-no-errors.sh

@@ -700,19 +700,17 @@ test_expect_success \
 # ----------------------------------------------------------------------
 # syntax highlighting
 
+test_lazy_prereq HIGHLIGHT '
+	highlight_version=$(highlight --version </dev/null 2>/dev/null) &&
+	test -n "$highlight_version"
+'
 
-highlight_version=$(highlight --version </dev/null 2>/dev/null)
-if [ $? -eq 127 ]; then
-	say "Skipping syntax highlighting tests: 'highlight' not found"
-elif test -z "$highlight_version"; then
-	say "Skipping syntax highlighting tests: incorrect 'highlight' found"
-else
-	test_set_prereq HIGHLIGHT
+test_expect_success HIGHLIGHT '
 	cat >>gitweb_config.perl <<-\EOF
 	our $highlight_bin = "highlight";
-	$feature{'highlight'}{'override'} = 1;
+	$feature{"highlight"}{"override"} = 1;
 	EOF
-fi
+'
 
 test_expect_success HIGHLIGHT \
 	'syntax highlighting (no highlight, unknown syntax)' \

t/t9903-bash-prompt.sh

@@ -66,10 +66,6 @@ test_expect_success 'prompt - unborn branch' '
 	test_cmp expected "$actual"
 '
 
-if test_have_prereq !FUNNYNAMES; then
-	say 'Your filesystem does not allow newlines in filenames.'
-fi
-
 test_expect_success FUNNYNAMES 'prompt - with newline in path' '
     repo_with_newline="repo
 with