[PATCH v4 2/4] t0006: add support for approxidate test date adjustment

[Tuomas Ahola <taahol@utu.fi>]

t0006 uses a hard-coded test date and provides no convenient
way to override it temporarily.  Add an optional parameter to
check_approxidate to adjust the time as needed, and demonstrate
the feature with a new test.

Signed-off-by: Tuomas Ahola <taahol@utu.fi>
---
 t/t0006-date.sh | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/t/t0006-date.sh b/t/t0006-date.sh
index 07bf6115ab..15fbc12861 100755
--- a/t/t0006-date.sh
+++ b/t/t0006-date.sh
@@ -155,12 +155,41 @@ check_parse '2100-00-00 00:00:00 -11' bad
 check_parse '2100-00-00 00:00:00 +11' bad
 REQUIRE_64BIT_TIME=
 
+add_time_offset() {
+	case "$3" in
+	hours)
+		unit=$(( 60*60 ))
+		;;
+	days)
+		unit=$(( 24*60*60 ))
+		;;
+	esac
+	offset=$(( $2 * unit ))
+	echo $(( $1 + offset ))
+}
+
 check_approxidate() {
+	old_date=$GIT_TEST_DATE_NOW
+	if test "$3" = "failure"
+	then
+		expection="$3"
+	else
+		expection=${4:-success}
+		offset="$3"
+	fi
+	if test -n "$offset"
+	then
+		GIT_TEST_DATE_NOW=$(add_time_offset $old_date $offset)
+		caption="$1; offset $offset"
+	else
+		caption=$1
+	fi
 	echo "$1 -> $2 +0000" >expect
-	test_expect_${3:-success} "parse approxidate ($1)" "
+	test_expect_$expection "parse approxidate ($caption)" "
 	test-tool date approxidate '$1' >actual &&
 	test_cmp expect actual
 	"
+	GIT_TEST_DATE_NOW=$old_date
 }
 
 check_approxidate now '2009-08-30 19:20:00'
@@ -183,6 +212,8 @@ check_approxidate 'noon today' '2009-08-30 12:00:00'
 check_approxidate 'noon yesterday' '2009-08-29 12:00:00'
 check_approxidate 'January 5th noon pm' '2009-01-05 12:00:00'
 check_approxidate '10am noon' '2009-08-29 12:00:00'
+check_approxidate 'January 5th yesterday' '2009-01-29 19:20:00'
+check_approxidate 'January 5th yesterday' '2008-12-31 19:20:00' '+2 days'
 
 check_approxidate 'last tuesday' '2009-08-25 19:20:00'
 check_approxidate 'July 5th' '2009-07-05 19:20:00'
-- 
2.30.2