[PATCH 3/3] t0006-date.sh: add `human` date format tests.

["Stephen P. Smith" <ischis2@cox.net>]

The `human` date format varies based on two inputs: the date in the
reference time which is constant and the local computers date which
varies.  Using hardcoded test expected output dates would require
holding the local machines date and time constant which is not
desireable.

Alternatively, letting the local date vary, which is the normal
situation, implies that the tests would be checking for formating
changes based on on a ref date relative to the local computers time.

When using `human` several fields are suppressed depending on the time
difference between the reference date and the local computer date. In
cases where the difference is less than a year, the year field is
supppressed. If the time is less than a day; the month and year is
suppressed.

Test using a regular expression to verify that fields that are
expected to be suppressed are not displayed.

Signed-off-by: Stephen P. Smith <ischis2@cox.net>
---
 t/t0006-date.sh | 24 ++++++++++++++++++++++++
 t/t4202-log.sh  | 24 ++++++++++++++++++++++++
 t/t7007-show.sh | 25 +++++++++++++++++++++++++
 3 files changed, 73 insertions(+)

diff --git a/t/t0006-date.sh b/t/t0006-date.sh
index ffb2975e48..f208a80867 100755
--- a/t/t0006-date.sh
+++ b/t/t0006-date.sh
@@ -40,6 +40,16 @@ check_show () {
 	'
 }
 
+check_human_date () {
+	time=$1
+	expect=$2
+	test_expect_success "check date ($format:$time)" '
+		echo "$time -> $expect" >expect &&
+		TZ=${zone:-$TZ} test-tool date show:"$format" "$time" >actual &&
+		grep "$expect" actual 
+	'
+}
+
 # arbitrary but sensible time for examples
 TIME='1466000000 +0200'
 check_show iso8601 "$TIME" '2016-06-15 16:13:20 +0200'
@@ -52,6 +62,20 @@ check_show unix "$TIME" '1466000000'
 check_show iso-local "$TIME" '2016-06-15 14:13:20 +0000'
 check_show raw-local "$TIME" '1466000000 +0000'
 check_show unix-local "$TIME" '1466000000'
+check_show human "$TIME" 'Jun 15 2016'
+
+# Subtract some known constant time and look for expected field format
+TODAY_REGEX='5 hours ago'
+THIS_YEAR_REGEX='[A-Z][a-z][a-z] [A-Z][a-z][a-z] [0-9]* [012][0-9]:[0-6][0-9]'
+MORE_THAN_A_YEAR_REGEX='[A-Z][a-z][a-z] [A-Z][a-z][a-z] [0-9]* [0-9][0-9][0-9][0-9]'
+check_human_date "$(($(date +%s)-18000)) +0200" $TODAY_REGEX # 5 hours ago
+check_human_date "$(($(date +%s)-432000)) +0200" $THIS_YEAR_REGEX  # 5 days ago
+check_human_date "$(($(date +%s)-1728000)) +0200" $THIS_YEAR_REGEX # 3 weeks ago
+check_human_date "$(($(date +%s)-13000000)) +0200" $THIS_YEAR_REGEX # 5 months ago
+check_human_date "$(($(date +%s)-31449600)) +0200" $THIS_YEAR_REGEX # 12 months ago
+check_human_date "$(($(date +%s)-37500000)) +0200" $MORE_THAN_A_YEAR_REGEX # 1 year, 2 months ago
+check_human_date "$(($(date +%s)-55188000)) +0200" $MORE_THAN_A_YEAR_REGEX # 1 year, 9 months ago
+check_human_date "$(($(date +%s)-630000000)) +0200" $MORE_THAN_A_YEAR_REGEX # 20 years ago
 
 check_show 'format:%z' "$TIME" '+0200'
 check_show 'format-local:%z' "$TIME" '+0000'
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 819c24d10e..d7f3b73650 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -1707,4 +1707,28 @@ test_expect_success '--exclude-promisor-objects does not BUG-crash' '
 	test_must_fail git log --exclude-promisor-objects source-a
 '
 
+check_human_date() {
+	commit_date=$1
+	expect=$2
+	test_expect_success "$commit_date" "
+		echo $expect $commit_date >dates && 
+		git add dates &&
+		git commit -m 'Expect String' --date=\"$commit_date\" dates &&
+		git log -1 --date=human | grep \"^Date:\" >actual &&
+		grep \"$expect\" actual
+"
+}
+
+TODAY_REGEX='[A-Z][a-z][a-z] [012][0-9]:[0-6][0-9] .0200'
+THIS_YEAR_REGEX='[A-Z][a-z][a-z] [A-Z][a-z][a-z] [0-9]* [012][0-9]:[0-6][0-9]'
+MORE_THAN_A_YEAR_REGEX='[A-Z][a-z][a-z] [A-Z][a-z][a-z] [0-9]* [0-9][0-9][0-9][0-9]'
+check_human_date "$(($(date +%s)-18000)) +0200" $TODAY_REGEX # 5 hours ago
+check_human_date "$(($(date +%s)-432000)) +0200" $THIS_YEAR_REGEX  # 5 days ago
+check_human_date "$(($(date +%s)-1728000)) +0200" $THIS_YEAR_REGEX # 3 weeks ago
+check_human_date "$(($(date +%s)-13000000)) +0200" $THIS_YEAR_REGEX # 5 months ago
+check_human_date "$(($(date +%s)-31449600)) +0200" $THIS_YEAR_REGEX # 12 months ago
+check_human_date "$(($(date +%s)-37500000)) +0200" $MORE_THAN_A_YEAR_REGEX # 1 year, 2 months ago
+check_human_date "$(($(date +%s)-55188000)) +0200" $MORE_THAN_A_YEAR_REGEX # 1 year, 9 months ago
+check_human_date "$(($(date +%s)-630000000)) +0200" $MORE_THAN_A_YEAR_REGEX # 20 years ago
+
 test_done
diff --git a/t/t7007-show.sh b/t/t7007-show.sh
index 42d3db6246..0a0334a8b5 100755
--- a/t/t7007-show.sh
+++ b/t/t7007-show.sh
@@ -128,4 +128,29 @@ test_expect_success 'show --graph is forbidden' '
   test_must_fail git show --graph HEAD
 '
 
+check_human_date() {
+	commit_date=$1
+	expect=$2
+	test_expect_success "$commit_date" "
+		echo $expect $commit_date >dates && 
+		git add dates &&
+		git commit -m 'Expect String' --date=\"$commit_date\" dates &&
+		git show --date=human | grep \"^Date:\" >actual &&
+		grep \"$expect\" actual
+"
+}
+
+TODAY_REGEX='[A-Z][a-z][a-z] [012][0-9]:[0-6][0-9] .0200'
+THIS_YEAR_REGEX='[A-Z][a-z][a-z] [A-Z][a-z][a-z] [0-9]* [012][0-9]:[0-6][0-9]'
+MORE_THAN_A_YEAR_REGEX='[A-Z][a-z][a-z] [A-Z][a-z][a-z] [0-9]* [0-9][0-9][0-9][0-9]'
+check_human_date "$(($(date +%s)-18000)) +0200" $TODAY_REGEX # 5 hours ago
+check_human_date "$(($(date +%s)-432000)) +0200" $THIS_YEAR_REGEX  # 5 days ago
+check_human_date "$(($(date +%s)-1728000)) +0200" $THIS_YEAR_REGEX # 3 weeks ago
+check_human_date "$(($(date +%s)-13000000)) +0200" $THIS_YEAR_REGEX # 5 months ago
+check_human_date "$(($(date +%s)-31449600)) +0200" $THIS_YEAR_REGEX # 12 months ago
+check_human_date "$(($(date +%s)-37500000)) +0200" $MORE_THAN_A_YEAR_REGEX # 1 year, 2 months ago
+check_human_date "$(($(date +%s)-55188000)) +0200" $MORE_THAN_A_YEAR_REGEX # 1 year, 9 months ago
+check_human_date "$(($(date +%s)-630000000)) +0200" $MORE_THAN_A_YEAR_REGEX # 20 years ago
+
+
 test_done
-- 
2.20.1.2.gb21ebb671b