Add tests for sparse checkout

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t1009-read-tree-sparse-checkout.sh b/t/t1009-read-tree-sparse-checkout.sh
new file mode 100755 (executable)
index 0000000..2192f5a
--- /dev/null
+++ b/t/t1009-read-tree-sparse-checkout.sh
@@ -0,0 +1,154 @@
+#!/bin/sh
+
+test_description='sparse checkout tests'
+
+. ./test-lib.sh
+
+cat >expected <<EOF
+100644 77f0ba1734ed79d12881f81b36ee134de6a3327b 0      init.t
+100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0      sub/added
+EOF
+test_expect_success 'setup' '
+       test_commit init &&
+       echo modified >> init.t &&
+       mkdir sub &&
+       touch sub/added &&
+       git add init.t sub/added &&
+       git commit -m "modified and added" &&
+       git tag top &&
+       git rm sub/added &&
+       git commit -m removed &&
+       git tag removed &&
+       git checkout top &&
+       git ls-files --stage > result &&
+       test_cmp expected result
+'
+
+cat >expected.swt <<EOF
+H init.t
+H sub/added
+EOF
+test_expect_success 'read-tree without .git/info/sparse-checkout' '
+       git read-tree -m -u HEAD &&
+       git ls-files --stage > result &&
+       test_cmp expected result &&
+       git ls-files -t > result &&
+       test_cmp expected.swt result
+'
+
+test_expect_success 'read-tree with .git/info/sparse-checkout but disabled' '
+       echo > .git/info/sparse-checkout
+       git read-tree -m -u HEAD &&
+       git ls-files -t > result &&
+       test_cmp expected.swt result &&
+       test -f init.t &&
+       test -f sub/added
+'
+
+test_expect_success 'read-tree --no-sparse-checkout with empty .git/info/sparse-checkout and enabled' '
+       git config core.sparsecheckout true &&
+       echo > .git/info/sparse-checkout &&
+       git read-tree --no-sparse-checkout -m -u HEAD &&
+       git ls-files -t > result &&
+       test_cmp expected.swt result &&
+       test -f init.t &&
+       test -f sub/added
+'
+
+cat >expected.swt <<EOF
+S init.t
+S sub/added
+EOF
+test_expect_success 'read-tree with empty .git/info/sparse-checkout' '
+       git config core.sparsecheckout true &&
+       echo > .git/info/sparse-checkout &&
+       git read-tree -m -u HEAD &&
+       git ls-files --stage > result &&
+       test_cmp expected result &&
+       git ls-files -t > result &&
+       test_cmp expected.swt result &&
+       test ! -f init.t &&
+       test ! -f sub/added
+'
+
+cat >expected.swt <<EOF
+S init.t
+H sub/added
+EOF
+test_expect_success 'match directories with trailing slash' '
+       echo sub/ > .git/info/sparse-checkout &&
+       git read-tree -m -u HEAD &&
+       git ls-files -t > result &&
+       test_cmp expected.swt result &&
+       test ! -f init.t &&
+       test -f sub/added
+'
+
+cat >expected.swt <<EOF
+H init.t
+H sub/added
+EOF
+test_expect_failure 'match directories without trailing slash' '
+       echo init.t > .git/info/sparse-checkout &&
+       echo sub >> .git/info/sparse-checkout &&
+       git read-tree -m -u HEAD &&
+       git ls-files -t > result &&
+       test_cmp expected.swt result &&
+       test ! -f init.t &&
+       test -f sub/added
+'
+
+cat >expected.swt <<EOF
+H init.t
+S sub/added
+EOF
+test_expect_success 'checkout area changes' '
+       echo init.t > .git/info/sparse-checkout &&
+       git read-tree -m -u HEAD &&
+       git ls-files -t > result &&
+       test_cmp expected.swt result &&
+       test -f init.t &&
+       test ! -f sub/added
+'
+
+test_expect_success 'read-tree updates worktree, absent case' '
+       echo sub/added > .git/info/sparse-checkout &&
+       git checkout -f top &&
+       git read-tree -m -u HEAD^ &&
+       test ! -f init.t
+'
+
+test_expect_success 'read-tree updates worktree, dirty case' '
+       echo sub/added > .git/info/sparse-checkout &&
+       git checkout -f top &&
+       echo dirty > init.t &&
+       git read-tree -m -u HEAD^ &&
+       grep -q dirty init.t &&
+       rm init.t
+'
+
+test_expect_success 'read-tree removes worktree, dirty case' '
+       echo init.t > .git/info/sparse-checkout &&
+       git checkout -f top &&
+       echo dirty > added &&
+       git read-tree -m -u HEAD^ &&
+       grep -q dirty added
+'
+
+test_expect_success 'read-tree adds to worktree, absent case' '
+       echo init.t > .git/info/sparse-checkout &&
+       git checkout -f removed &&
+       git read-tree -u -m HEAD^ &&
+       test ! -f sub/added
+'
+
+test_expect_success 'read-tree adds to worktree, dirty case' '
+       echo init.t > .git/info/sparse-checkout &&
+       git checkout -f removed &&
+       mkdir sub &&
+       echo dirty > sub/added &&
+       git read-tree -u -m HEAD^ &&
+       grep -q dirty sub/added
+'
+
+test_done