t1092: add compatibility tests for 'git show'

Signed-off-by: Derrick Stolee <[email protected]>

Author: derrickstolee

t/t1092-sparse-checkout-compatibility.sh

@@ -1164,6 +1164,22 @@ test_expect_success 'clean' '
 	test_sparse_match test_path_is_dir folder1
 '
 
+test_expect_success 'show (cached blobs/trees)' '
+	init_repos &&
+
+	test_all_match git show :a &&
+	test_all_match git show :deep/a &&
+	test_sparse_match git show :folder1/a &&
+
+	# Asking "git show" for directories in the index
+	# does not work as implemented. The error message is
+	# different for a full checkout and a sparse checkout
+	# when the directory is outside of the cone.
+	test_all_match test_must_fail git show :deep/ &&
+	test_must_fail git -C full-checkout show :folder1/ &&
+	test_sparse_match test_must_fail git show :folder1/
+'
+
 test_expect_success 'submodule handling' '
 	init_repos &&