Make it possible to run tests with set -x

One can now run:

    make TRACE_TESTS=1 check

to get detailed output

tests/jqtest

@@ -1,5 +1,5 @@
 #!/bin/sh
 
-. "${0%/*}/setup"
+. "${0%/*}/setup" "$@"
 
 $VALGRIND $Q $JQ -L "$mods" --run-tests $JQTESTDIR/jq.test

tests/mantest

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-. "${0%/*}/setup"
+. "${0%/*}/setup" "$@"
 
 # We set PAGER because there's a mantest for `env` that uses it.
 (cd $JQBASEDIR/docs && rake mantests) |

tests/onigtest

@@ -1,5 +1,5 @@
 #!/bin/sh
 
-. "${0%/*}/setup"
+. "${0%/*}/setup" "$@"
 
 $VALGRIND $Q $JQ -L "$mods" --run-tests $JQTESTDIR/onig.test

tests/optionaltest

@@ -1,5 +1,5 @@
 #!/bin/sh
 
-. "${0%/*}/setup"
+. "${0%/*}/setup" "$@"
 
 $VALGRIND $Q $JQ -L "$mods" --run-tests $JQTESTDIR/optional.test

tests/setup

@@ -2,6 +2,10 @@
 
 # This is meant to be included by each test's shell script driver.
 
+if [ -n "$TRACE_TESTS" ]; then
+    set -x
+fi
+
 set -eu
 
 JQTESTDIR=$(cd "$(dirname "$0")" && pwd)

tests/shtest

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-. "${0%/*}/setup"
+. "${0%/*}/setup" "$@"
 
 PATH=$JQBASEDIR:$PATH $JQBASEDIR/tests/jq-f-test.sh > /dev/null