-cat >expected <<\EOF
-'refs/heads/master' 'Mon Jul 3 17:18:43 2006 +0200' 'Mon Jul 3 17:18:44 2006 +0200'
-'refs/tags/testtag' 'Mon Jul 3 17:18:45 2006 +0200'
-EOF
+test_date () {
+ f=$1 &&
+ committer_date=$2 &&
+ author_date=$3 &&
+ tagger_date=$4 &&
+ cat >expected <<-EOF &&
+ 'refs/heads/master' '$committer_date' '$author_date'
+ 'refs/tags/testtag' '$tagger_date'
+ EOF
+ (
+ git for-each-ref --shell \
+ --format="%(refname) %(committerdate${f:+:$f}) %(authordate${f:+:$f})" \
+ refs/heads &&
+ git for-each-ref --shell \
+ --format="%(refname) %(taggerdate${f:+:$f})" \
+ refs/tags
+ ) >actual &&
+ test_cmp expected actual
+}