[PATCH v4 1/3] test-lib: show missing prereq summary

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When running the full test suite many tests can be skipped because of
missing prerequisites. It not easy right now to get an overview of which
ones are missing.
When switching to a new machine or environment some libraries and tools
might be missing or maybe a dependency broke completely. In this case
the tests would indicate nothing since all dependant tests are simply
skipped. This could hide broken behaviour or missing features in the
build. Therefore this patch summarizes the missing prereqs at the end of
the test run making it easier to spot such cases.

 - Add failed prereqs to the test results.
 - Aggregate and then show them with the totals.

Signed-off-by: Fabian Stelzer <fs@xxxxxxxxxxxx>
---
 t/aggregate-results.sh | 17 +++++++++++++++++
 t/test-lib.sh          | 11 +++++++++++
 2 files changed, 28 insertions(+)

diff --git a/t/aggregate-results.sh b/t/aggregate-results.sh
index 7913e206ed..7f2b83bdc8 100755
--- a/t/aggregate-results.sh
+++ b/t/aggregate-results.sh
@@ -6,6 +6,7 @@ success=0
 failed=0
 broken=0
 total=0
+missing_prereq=
 
 while read file
 do
@@ -30,10 +31,26 @@ do
 			broken=$(($broken + $value)) ;;
 		total)
 			total=$(($total + $value)) ;;
+		missing_prereq)
+			missing_prereq="$missing_prereq,$value" ;;
 		esac
 	done <"$file"
 done
 
+if test -n "$missing_prereq"
+then
+	unique_missing_prereq=$(
+		echo $missing_prereq |
+		tr -s "," "\n" |
+		grep -v '^$' |
+		sort -u |
+		paste -s -d ' ')
+	if test -n "$unique_missing_prereq"
+	then
+		printf "\nmissing prereq: $unique_missing_prereq\n\n"
+	fi
+fi
+
 if test -n "$failed_tests"
 then
 	printf "\nfailed test(s):$failed_tests\n\n"
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 57efcc5e97..9090ce1225 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -669,6 +669,8 @@ test_fixed=0
 test_broken=0
 test_success=0
 
+test_missing_prereq=
+
 test_external_has_tap=0
 
 die () {
@@ -1069,6 +1071,14 @@ test_skip () {
 			of_prereq=" of $test_prereq"
 		fi
 		skipped_reason="missing $missing_prereq${of_prereq}"
+
+		# Keep a list of all the missing prereq for result aggregation
+		if test -z "$missing_prereq"
+		then
+			test_missing_prereq=$missing_prereq
+		else
+			test_missing_prereq="$test_missing_prereq,$missing_prereq"
+		fi
 	fi
 
 	case "$to_skip" in
@@ -1175,6 +1185,7 @@ test_done () {
 		fixed $test_fixed
 		broken $test_broken
 		failed $test_failure
+		missing_prereq $test_missing_prereq
 
 		EOF
 	fi
-- 
2.31.1




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