[PATCH 3/5] t6050-replace: test that objects are of the same type

@@ -263,4 +263,17 @@ test_expect_success 'not just commits' '
 	test_cmp file.replaced file
 '
 
+test_expect_success 'replaced and replacement objects must be of the same type' '
+	test_must_fail git replace mytag $HASH1 2>err &&
+	grep "Object ref '\''mytag'\'' is of type '\''tag'\''" err &&
+	grep "replace ref '\''$HASH1'\'' is of type '\''commit'\''" err &&
+	test_must_fail git replace HEAD^{tree} HEAD~1 2>err &&
+	grep "Object ref '\''HEAD^{tree}'\'' is of type '\''tree'\''" err &&
+	grep "replace ref '\''HEAD~1'\'' is of type '\''commit'\''" err &&
+	BLOB=$(git rev-parse :file) &&
+	test_must_fail git replace HEAD^ $BLOB 2>err &&
+	grep "Object ref '\''HEAD^'\'' is of type '\''commit'\''" err &&
+	grep "replace ref '\''$BLOB'\'' is of type '\''blob'\''" err
+'
+
 test_done