[PATCH 1/3] Demonstrate broken t6001 test case function

Junio discovered a problem where an actual test case break was hidden because pipelines
are not handled properly by the test infrastructure in t6001.

This patch fixes the broken infrastructure (and demonstrates the break explicitly).

A subsequent patch in this series will fix the test case so that it doesn't fail.

Signed-off-by: Jon Seymour <redacted>
---

This patch set:
   * demonstrates and fixes some broken test infrastructure
   * fixes a broken test case that was previously hidden by the broken infrastructure
   * simplifies the test case to remove an unnecessary sort.

Although all patches in the set touch the same file, I have broken it into
three smaller patches to highlight the 3 different changes.

This patch set patches assumes that this series has been applied:

[PATCH 1/2] Test case that demonstrates problem with --merge-order ^ processing
[PATCH 2/2] Fix for git-rev-list --merge-order B ^A (A,B share common base) [rev 2]

 t/t6001-rev-list-merge-order.sh |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

0b0041e1fdb1b25757b0c861a0832c54b922440b

diff --git a/t/t6001-rev-list-merge-order.sh b/t/t6001-rev-list-merge-order.sh
--- a/t/t6001-rev-list-merge-order.sh
+++ b/t/t6001-rev-list-merge-order.sh

@@ -85,13 +85,12 @@ check_output()
 {
 	_name=$1
 	shift 1
-	if "$@" | entag > $_name.actual
+	if eval "$*" | entag > $_name.actual
 	then
 		diff $_name.expected $_name.actual
 	else
 		return 1;
 	fi
-	
 }
 
 # Turn a reasonable test description into a reasonable test name.

@@ -114,7 +113,7 @@ test_output_expect_success()
         [ $# -eq 2 ] || error "usage: test_output_expect_success description test <<EOF ... EOF"
         _name=$(echo $_description | name_from_description)
 	cat > $_name.expected
-	test_expect_success "$_description" "check_output $_name $_test" 
+	test_expect_success "$_description" "check_output $_name \"$_test\"" 
 }
 
 # --- end of stuff to move ---
------------