invalid_variable_name='${foo.bar}'
+actual="$TRASH_DIRECTORY/actual"
+
+test_expect_success 'setup for __gitdir tests' '
+ mkdir -p subdir/subsubdir &&
+ git init otherrepo
+'
+
+test_expect_success '__gitdir - from command line (through $__git_dir)' '
+ echo "$TRASH_DIRECTORY/otherrepo/.git" >expected &&
+ (
+ __git_dir="$TRASH_DIRECTORY/otherrepo/.git" &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - repo as argument' '
+ echo "otherrepo/.git" >expected &&
+ __gitdir "otherrepo" >"$actual" &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - remote as argument' '
+ echo "remote" >expected &&
+ __gitdir "remote" >"$actual" &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - .git directory in cwd' '
+ echo ".git" >expected &&
+ __gitdir >"$actual" &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - .git directory in parent' '
+ echo "$(pwd -P)/.git" >expected &&
+ (
+ cd subdir/subsubdir &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - cwd is a .git directory' '
+ echo "." >expected &&
+ (
+ cd .git &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - parent is a .git directory' '
+ echo "$(pwd -P)/.git" >expected &&
+ (
+ cd .git/refs/heads &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - $GIT_DIR set while .git directory in cwd' '
+ echo "$TRASH_DIRECTORY/otherrepo/.git" >expected &&
+ (
+ GIT_DIR="$TRASH_DIRECTORY/otherrepo/.git" &&
+ export GIT_DIR &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - $GIT_DIR set while .git directory in parent' '
+ echo "$TRASH_DIRECTORY/otherrepo/.git" >expected &&
+ (
+ GIT_DIR="$TRASH_DIRECTORY/otherrepo/.git" &&
+ export GIT_DIR &&
+ cd subdir &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - non-existing $GIT_DIR' '
+ (
+ GIT_DIR="$TRASH_DIRECTORY/non-existing" &&
+ export GIT_DIR &&
+ test_must_fail __gitdir
+ )
+'
+
+test_expect_success '__gitdir - gitfile in cwd' '
+ echo "$(pwd -P)/otherrepo/.git" >expected &&
+ echo "gitdir: $TRASH_DIRECTORY/otherrepo/.git" >subdir/.git &&
+ test_when_finished "rm -f subdir/.git" &&
+ (
+ cd subdir &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - gitfile in parent' '
+ echo "$(pwd -P)/otherrepo/.git" >expected &&
+ echo "gitdir: $TRASH_DIRECTORY/otherrepo/.git" >subdir/.git &&
+ test_when_finished "rm -f subdir/.git" &&
+ (
+ cd subdir/subsubdir &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success SYMLINKS '__gitdir - resulting path avoids symlinks' '
+ echo "$(pwd -P)/otherrepo/.git" >expected &&
+ mkdir otherrepo/dir &&
+ test_when_finished "rm -rf otherrepo/dir" &&
+ ln -s otherrepo/dir link &&
+ test_when_finished "rm -f link" &&
+ (
+ cd link &&
+ __gitdir >"$actual"
+ ) &&
+ test_cmp expected "$actual"
+'
+
+test_expect_success '__gitdir - not a git repository' '
+ (
+ cd subdir/subsubdir &&
+ GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY" &&
+ export GIT_CEILING_DIRECTORIES &&
+ test_must_fail __gitdir
+ )
+'
+
test_expect_success '__gitcomp - trailing space - options' '
test_gitcomp "--re" "--dry-run --reuse-message= --reedit-message=
--reset-author" <<-EOF