du: tests: make H_flag tests more strict about output requirements

The current version of this test will effectively pass as long as one of the
specified paths is in the output, and it could even be a subset of one of
the paths.

Strengthen up the test a little bit:
  * Specify beginning/end anchors for each path
  * Add egrep -v checks to make sure we don't have any *additional* paths
  * Ratchet down paths2 to exactly the two paths we expect to appear

(cherry picked from commit 3c5c39c7ad8f010cfa5fc0db43d15d1964b4cf16)

1 files changed, 12 insertions, 4 deletions

diff --git a/usr.bin/du/tests/du_test.sh b/usr.bin/du/tests/du_test.sh
index 4a8f11e83ff5..92a26deae02b 100755
--- a/usr.bin/du/tests/du_test.sh
+++ b/usr.bin/du/tests/du_test.sh
@@ -45,17 +45,25 @@ H_flag_head()
 H_flag_body()
 {
 	local paths1='testdir/A/B testdir/A testdir/C testdir'
-	local paths2='testdir/A/B testdir/A testdir/C testdir'
+	local paths2='testdir/C/B testdir/C'
 	local lineprefix="^[0-9]+$(printf "\t")"
-	local sep="\n${lineprefix}"
+	local sep="\$\n${lineprefix}"
 
 	atf_check mkdir testdir
 	atf_check -x "cd testdir && mkdir A && touch A/B && ln -s A C"
 
 	atf_check -o save:du.out du -aAH testdir
-	atf_check egrep -q "${lineprefix}$(echo $paths1 | sed -e "s/ /$sep/g")" du.out
+	atf_check egrep -q "${lineprefix}$(echo $paths1 | sed -e "s/ /$sep/g")$" du.out
+	# Check that the output doesn't contain any lines (i.e. paths) that we
+	# did not expect it to contain from $paths1.
+	atf_check -s exit:1 egrep -vq "${lineprefix}$(echo $paths1 | sed -e "s/ /$sep/g")$" du.out
+
 	atf_check -o save:du_C.out du -aAH testdir/C
-	atf_check egrep -q "${lineprefix}$(echo $paths2 | sed -e "s/ /$sep/g")" du_C.out
+	atf_check egrep -q "${lineprefix}$(echo $paths2 | sed -e "s/ /$sep/g")$" du_C.out
+
+	# Check that the output doesn't contain any lines (i.e. paths) that we
+	# did not expect it to contain from $paths2.
+	atf_check -s exit:1 egrep -vq "${lineprefix}$(echo $paths2 | sed -e "s/ /$sep/g")$" du_C.out
 }
 
 atf_test_case I_flag