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diff --git a/t/t7414-submodule-mistakes.sh b/t/t7414-submodule-mistakes.sh
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+#!/bin/sh
+
+test_description='handling of common mistakes people may make with submodules'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'create embedded repository' '
+ git init embed &&
+ test_commit -C embed one
+'
+
+test_expect_success 'git-add on embedded repository warns' '
+ test_when_finished "git rm --cached -f embed" &&
+ git add embed 2>stderr &&
+ test_grep warning stderr
+'
+
+test_expect_success '--no-warn-embedded-repo suppresses warning' '
+ test_when_finished "git rm --cached -f embed" &&
+ git add --no-warn-embedded-repo embed 2>stderr &&
+ test_grep ! warning stderr
+'
+
+test_expect_success 'no warning when updating entry' '
+ test_when_finished "git rm --cached -f embed" &&
+ git add embed &&
+ git -C embed commit --allow-empty -m two &&
+ git add embed 2>stderr &&
+ test_grep ! warning stderr
+'
+
+test_expect_success 'submodule add does not warn' '
+ test_when_finished "git rm -rf submodule .gitmodules" &&
+ git -c protocol.file.allow=always \
+ submodule add ./embed submodule 2>stderr &&
+ test_grep ! warning stderr
+'
+
+test_done