diff --git a/t/t7401-submodule-summary.sh b/t/t7401-submodule-summary.sh
new file mode 100755
index 0000000000..0f3c42ab35
--- /dev/null
+++ b/t/t7401-submodule-summary.sh
@@ -0,0 +1,195 @@
+#!/bin/sh
+#
+# Copyright (c) 2008 Ping Yin
+#
+
+test_description='Summary support for submodules
+
+This test tries to verify the sanity of summary subcommand of git-submodule.
+'
+
+. ./test-lib.sh
+
+add_file () {
+	sm=$1
+	shift
+	owd=$(pwd)
+	cd "$sm"
+	for name; do
+		echo "$name" > "$name" &&
+		git add "$name" &&
+		test_tick &&
+		git commit -m "Add $name"
+	done >/dev/null
+	git rev-parse --verify HEAD | cut -c1-7
+	cd "$owd"
+}
+commit_file () {
+	test_tick &&
+	git commit "$@" -m "Commit $*" >/dev/null
+}
+
+test_create_repo sm1 &&
+add_file . foo
+
+head1=$(add_file sm1 foo1 foo2)
+
+test_expect_success 'added submodule' "
+	git add sm1 &&
+	git submodule summary >actual &&
+	diff actual - <<-EOF
+* sm1 0000000...$head1 (2):
+  > Add foo2
+
+EOF
+"
+
+commit_file sm1 &&
+head2=$(add_file sm1 foo3)
+
+test_expect_success 'modified submodule(forward)' "
+	git submodule summary >actual &&
+	diff actual - <<-EOF
+* sm1 $head1...$head2 (1):
+  > Add foo3
+
+EOF
+"
+
+commit_file sm1 &&
+cd sm1 &&
+git reset --hard HEAD~2 >/dev/null &&
+head3=$(git rev-parse --verify HEAD | cut -c1-7) &&
+cd ..
+
+test_expect_success 'modified submodule(backward)' "
+    git submodule summary >actual &&
+    diff actual - <<-EOF
+* sm1 $head2...$head3 (2):
+  < Add foo3
+  < Add foo2
+
+EOF
+"
+
+head4=$(add_file sm1 foo4 foo5) &&
+head4_full=$(GIT_DIR=sm1/.git git rev-parse --verify HEAD)
+test_expect_success 'modified submodule(backward and forward)' "
+    git submodule summary >actual &&
+    diff actual - <<-EOF
+* sm1 $head2...$head4 (4):
+  > Add foo5
+  > Add foo4
+  < Add foo3
+  < Add foo2
+
+EOF
+"
+
+test_expect_success '--summary-limit' "
+    git submodule summary -n 3 >actual &&
+    diff actual - <<-EOF
+* sm1 $head2...$head4 (4):
+  > Add foo5
+  > Add foo4
+  < Add foo3
+
+EOF
+"
+
+commit_file sm1 &&
+mv sm1 sm1-bak &&
+echo sm1 >sm1 &&
+head5=$(git hash-object sm1 | cut -c1-7) &&
+git add sm1 &&
+rm -f sm1 &&
+mv sm1-bak sm1
+
+test_expect_success 'typechanged submodule(submodule->blob), --cached' "
+    git submodule summary --cached >actual &&
+    diff actual - <<-EOF
+* sm1 $head4(submodule)->$head5(blob) (3):
+  < Add foo5
+
+EOF
+"
+
+rm -rf sm1 &&
+git checkout-index sm1
+test_expect_success 'typechanged submodule(submodule->blob)' "
+    git submodule summary >actual &&
+    diff actual - <<-EOF
+* sm1 $head4(submodule)->$head5(blob):
+
+EOF
+"
+
+rm -f sm1 &&
+test_create_repo sm1 &&
+head6=$(add_file sm1 foo6 foo7)
+test_expect_success 'nonexistent commit' "
+    git submodule summary >actual &&
+    diff actual - <<-EOF
+* sm1 $head4...$head6:
+  Warn: sm1 doesn't contain commit $head4_full
+
+EOF
+"
+
+commit_file
+test_expect_success 'typechanged submodule(blob->submodule)' "
+    git submodule summary >actual &&
+    diff actual - <<-EOF
+* sm1 $head5(blob)->$head6(submodule) (2):
+  > Add foo7
+
+EOF
+"
+
+commit_file sm1 &&
+rm -rf sm1
+test_expect_success 'deleted submodule' "
+    git submodule summary >actual &&
+    diff actual - <<-EOF
+* sm1 $head6...0000000:
+
+EOF
+"
+
+test_create_repo sm2 &&
+head7=$(add_file sm2 foo8 foo9) &&
+git add sm2
+
+test_expect_success 'multiple submodules' "
+    git submodule summary >actual &&
+    diff actual - <<-EOF
+* sm1 $head6...0000000:
+
+* sm2 0000000...$head7 (2):
+  > Add foo9
+
+EOF
+"
+
+test_expect_success 'path filter' "
+    git submodule summary sm2 >actual &&
+    diff actual - <<-EOF
+* sm2 0000000...$head7 (2):
+  > Add foo9
+
+EOF
+"
+
+commit_file sm2
+test_expect_success 'given commit' "
+    git submodule summary HEAD^ >actual &&
+    diff actual - <<-EOF
+* sm1 $head6...0000000:
+
+* sm2 0000000...$head7 (2):
+  > Add foo9
+
+EOF
+"
+
+test_done