Many tests have an initial setup step that might fail based
on whether earlier tests in the script have succeeded or
not. Using a trick like "|| true" breaks the &&-chain,
missing earlier failures (and fooling --chain-lint).

We can use test_might_fail in some cases, which is correct
and makes the intent more obvious. We can also use
test_unconfig for unsetting config (and which is more
robust, as well).

The case in t9500 is an oddball. It wants to run cmd1 _or_
cmd2, and does it like:

  cmd1 || cmd2 &&
  other_stuff

It's not wrong in this case, but it's a bad habit to get
into, because it breaks the &&-chain if used anywhere except
at the beginning of the test (and we use the correct
solution here, putting it inside a block for precedence).

Signed-off-by: Jeff King <p...@peff.net>
---
 t/t5503-tagfollow.sh                   | 4 ++--
 t/t6032-merge-large-rename.sh          | 6 +++---
 t/t7201-co.sh                          | 2 +-
 t/t7508-status.sh                      | 2 +-
 t/t9500-gitweb-standalone-no-errors.sh | 5 ++++-
 5 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/t/t5503-tagfollow.sh b/t/t5503-tagfollow.sh
index f30c038..4ca48f0 100755
--- a/t/t5503-tagfollow.sh
+++ b/t/t5503-tagfollow.sh
@@ -139,8 +139,8 @@ EOF
 '
 
 test_expect_success 'new clone fetch master and tags' '
-       git branch -D cat
-       rm -f $U
+       test_might_fail git branch -D cat &&
+       rm -f $U &&
        (
                mkdir clone2 &&
                cd clone2 &&
diff --git a/t/t6032-merge-large-rename.sh b/t/t6032-merge-large-rename.sh
index 15beecc..0f79268 100755
--- a/t/t6032-merge-large-rename.sh
+++ b/t/t6032-merge-large-rename.sh
@@ -28,10 +28,10 @@ make_text() {
 
 test_rename() {
        test_expect_success "rename ($1, $2)" '
-       n='$1'
-       expect='$2'
+       n='$1' &&
+       expect='$2' &&
        git checkout -f master &&
-       git branch -D test$n || true &&
+       test_might_fail git branch -D test$n &&
        git reset --hard initial &&
        for i in $(count $n); do
                make_text $i initial initial >$i
diff --git a/t/t7201-co.sh b/t/t7201-co.sh
index eae9e5a..a7fe4e6 100755
--- a/t/t7201-co.sh
+++ b/t/t7201-co.sh
@@ -591,7 +591,7 @@ test_expect_success 'checkout --conflict=merge, overriding 
config' '
 '
 
 test_expect_success 'checkout --conflict=diff3' '
-       git config --unset merge.conflictstyle
+       test_unconfig merge.conflictstyle &&
        setup_conflicting_index &&
        echo "none of the above" >sample &&
        echo ourside >expect &&
diff --git a/t/t7508-status.sh b/t/t7508-status.sh
index 0f9ad4c..c3ed7cb 100755
--- a/t/t7508-status.sh
+++ b/t/t7508-status.sh
@@ -538,7 +538,7 @@ A  dir2/added
 ?? untracked
 EOF
 test_expect_success 'status -s -uall' '
-       git config --unset status.showuntrackedfiles
+       test_unconfig status.showuntrackedfiles &&
        git status -s -uall >output &&
        test_cmp expect output
 '
diff --git a/t/t9500-gitweb-standalone-no-errors.sh 
b/t/t9500-gitweb-standalone-no-errors.sh
index f9f078e..e94b2f1 100755
--- a/t/t9500-gitweb-standalone-no-errors.sh
+++ b/t/t9500-gitweb-standalone-no-errors.sh
@@ -779,7 +779,10 @@ test_expect_success \
 
 test_expect_success \
        'unborn HEAD: "summary" page (with "heads" subview)' \
-       'git checkout orphan_branch || git checkout --orphan orphan_branch &&
+       '{
+               git checkout orphan_branch ||
+               git checkout --orphan orphan_branch
+        } &&
         test_when_finished "git checkout master" &&
         gitweb_run "p=.git;a=summary"'
 
-- 
2.3.3.520.g3cfbb5d

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