diff --git a/.gitignore b/.gitignore
index 3a8816c..9958159 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
+# Reserved for testing
+a/
+b/
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
diff --git a/tests/test.sh b/tests/test.sh
new file mode 100755
index 0000000..4a61647
--- /dev/null
+++ b/tests/test.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# use rere.py, see https://github.com/tsoding/rere.py
+rm -rf a b && mkdir -p a b
+touch a/0.log a/1.log a/1.txt a/2.txt
+pdm run batchlink -S a -d b --dry-run '*' '{path}'
+pdm run batchlink -S a -d b -c --dry-run '*' '{path}'
+pdm run batchlink -S a -d b -R --dry-run '*' '{path}'
+pdm run batchlink -S a -d b -sR --dry-run '*' '{path}'
+pdm run batchlink -S a -d b --dry-run '*.log' '{num}.log'
+pdm run batchlink -S a -d b -c --dry-run '*.log' '{num}.log'
+pdm run batchlink -S a -d b -R --dry-run '*.log' '{num}.log'
+pdm run batchlink -S a -d b -sR --dry-run '*.log' '{num}.log'
+pdm run batchlink -S a -d b -f '*' '{path}'
+pdm run batchlink -S a -d b -c -f '*' '{path}'
+pdm run batchlink -S a -d b -R -f '*' '{path}'
+pdm run batchlink -S a -d b -sR -f '*' '{path}'
+pdm run batchlink -S a -d b -f '*.log' '{num}.log'
+pdm run batchlink -S a -d b -c -f '*.log' '{num}.log'
+pdm run batchlink -S a -d b -R -f '*.log' '{num}.log'
+pdm run batchlink -S a -d b -sR -f '*.log' '{num}.log'
+pdm run batchlink -S a -d b -r --dry-run '*' '{path}'
+pdm run batchlink -S a -d b -r --dry-run '*.log' '{num}.log'
+pdm run batchlink -S a -d b -r -f '*.log' '{num}.log'
+pdm run batchlink -S a -d b -r -f '*' '{path}'
diff --git a/tests/test.sh.bi b/tests/test.sh.bi
new file mode 100644
index 0000000..0abf89f
--- /dev/null
+++ b/tests/test.sh.bi
@@ -0,0 +1,250 @@
+:i count 24
+:b shell 19
+#!/usr/bin/env bash
+:i returncode 0
+:b stdout 0
+
+:b stderr 0
+
+:b shell 53
+# use rere.py, see https://github.com/tsoding/rere.py
+:i returncode 0
+:b stdout 0
+
+:b stderr 0
+
+:b shell 26
+rm -rf a b && mkdir -p a b
+:i returncode 0
+:b stdout 0
+
+:b stderr 0
+
+:b shell 37
+touch a/0.log a/1.log a/1.txt a/2.txt
+:i returncode 0
+:b stdout 0
+
+:b stderr 0
+
+:b shell 50
+pdm run batchlink -S a -d b --dry-run '*' '{path}'
+:i returncode 0
+:b stdout 144
+Create hard link b/0.log to a/0.log
+Create hard link b/1.log to a/1.log
+Create hard link b/1.txt to a/1.txt
+Create hard link b/2.txt to a/2.txt
+
+:b stderr 0
+
+:b shell 53
+pdm run batchlink -S a -d b -c --dry-run '*' '{path}'
+:i returncode 0
+:b stdout 96
+Copy a/0.log to b/0.log
+Copy a/1.log to b/1.log
+Copy a/1.txt to b/1.txt
+Copy a/2.txt to b/2.txt
+
+:b stderr 0
+
+:b shell 53
+pdm run batchlink -S a -d b -R --dry-run '*' '{path}'
+:i returncode 0
+:b stdout 144
+Create hard link b/0.log to a/0.log
+Create hard link b/1.log to a/1.log
+Create hard link b/1.txt to a/1.txt
+Create hard link b/2.txt to a/2.txt
+
+:b stderr 0
+
+:b shell 54
+pdm run batchlink -S a -d b -sR --dry-run '*' '{path}'
+:i returncode 0
+:b stdout 172
+Create symbolic link b/0.log to ../a/0.log
+Create symbolic link b/1.log to ../a/1.log
+Create symbolic link b/1.txt to ../a/1.txt
+Create symbolic link b/2.txt to ../a/2.txt
+
+:b stderr 0
+
+:b shell 57
+pdm run batchlink -S a -d b --dry-run '*.log' '{num}.log'
+:i returncode 0
+:b stdout 72
+Create hard link b/1.log to a/0.log
+Create hard link b/2.log to a/1.log
+
+:b stderr 0
+
+:b shell 60
+pdm run batchlink -S a -d b -c --dry-run '*.log' '{num}.log'
+:i returncode 0
+:b stdout 48
+Copy a/0.log to b/1.log
+Copy a/1.log to b/2.log
+
+:b stderr 0
+
+:b shell 60
+pdm run batchlink -S a -d b -R --dry-run '*.log' '{num}.log'
+:i returncode 0
+:b stdout 72
+Create hard link b/1.log to a/0.log
+Create hard link b/2.log to a/1.log
+
+:b stderr 0
+
+:b shell 61
+pdm run batchlink -S a -d b -sR --dry-run '*.log' '{num}.log'
+:i returncode 0
+:b stdout 86
+Create symbolic link b/1.log to ../a/0.log
+Create symbolic link b/2.log to ../a/1.log
+
+:b stderr 0
+
+:b shell 43
+pdm run batchlink -S a -d b -f '*' '{path}'
+:i returncode 0
+:b stdout 144
+Create hard link b/0.log to a/0.log
+Create hard link b/1.log to a/1.log
+Create hard link b/1.txt to a/1.txt
+Create hard link b/2.txt to a/2.txt
+
+:b stderr 0
+
+:b shell 46
+pdm run batchlink -S a -d b -c -f '*' '{path}'
+:i returncode 0
+:b stdout 156
+Remove b/0.log
+Copy a/0.log to b/0.log
+Remove b/1.log
+Copy a/1.log to b/1.log
+Remove b/1.txt
+Copy a/1.txt to b/1.txt
+Remove b/2.txt
+Copy a/2.txt to b/2.txt
+
+:b stderr 0
+
+:b shell 46
+pdm run batchlink -S a -d b -R -f '*' '{path}'
+:i returncode 0
+:b stdout 204
+Remove b/0.log
+Create hard link b/0.log to a/0.log
+Remove b/1.log
+Create hard link b/1.log to a/1.log
+Remove b/1.txt
+Create hard link b/1.txt to a/1.txt
+Remove b/2.txt
+Create hard link b/2.txt to a/2.txt
+
+:b stderr 0
+
+:b shell 47
+pdm run batchlink -S a -d b -sR -f '*' '{path}'
+:i returncode 0
+:b stdout 232
+Remove b/0.log
+Create symbolic link b/0.log to ../a/0.log
+Remove b/1.log
+Create symbolic link b/1.log to ../a/1.log
+Remove b/1.txt
+Create symbolic link b/1.txt to ../a/1.txt
+Remove b/2.txt
+Create symbolic link b/2.txt to ../a/2.txt
+
+:b stderr 0
+
+:b shell 50
+pdm run batchlink -S a -d b -f '*.log' '{num}.log'
+:i returncode 0
+:b stdout 87
+Remove b/1.log
+Create hard link b/1.log to a/0.log
+Create hard link b/2.log to a/1.log
+
+:b stderr 0
+
+:b shell 53
+pdm run batchlink -S a -d b -c -f '*.log' '{num}.log'
+:i returncode 0
+:b stdout 78
+Remove b/1.log
+Copy a/0.log to b/1.log
+Remove b/2.log
+Copy a/1.log to b/2.log
+
+:b stderr 0
+
+:b shell 53
+pdm run batchlink -S a -d b -R -f '*.log' '{num}.log'
+:i returncode 0
+:b stdout 102
+Remove b/1.log
+Create hard link b/1.log to a/0.log
+Remove b/2.log
+Create hard link b/2.log to a/1.log
+
+:b stderr 0
+
+:b shell 54
+pdm run batchlink -S a -d b -sR -f '*.log' '{num}.log'
+:i returncode 0
+:b stdout 116
+Remove b/1.log
+Create symbolic link b/1.log to ../a/0.log
+Remove b/2.log
+Create symbolic link b/2.log to ../a/1.log
+
+:b stderr 0
+
+:b shell 53
+pdm run batchlink -S a -d b -r --dry-run '*' '{path}'
+:i returncode 0
+:b stdout 104
+Rename a/0.log to b/0.log
+Rename a/1.log to b/1.log
+Rename a/1.txt to b/1.txt
+Rename a/2.txt to b/2.txt
+
+:b stderr 0
+
+:b shell 60
+pdm run batchlink -S a -d b -r --dry-run '*.log' '{num}.log'
+:i returncode 0
+:b stdout 52
+Rename a/0.log to b/1.log
+Rename a/1.log to b/2.log
+
+:b stderr 0
+
+:b shell 53
+pdm run batchlink -S a -d b -r -f '*.log' '{num}.log'
+:i returncode 0
+:b stdout 82
+Remove b/1.log
+Rename a/0.log to b/1.log
+Remove b/2.log
+Rename a/1.log to b/2.log
+
+:b stderr 0
+
+:b shell 46
+pdm run batchlink -S a -d b -r -f '*' '{path}'
+:i returncode 0
+:b stdout 82
+Remove b/1.txt
+Rename a/1.txt to b/1.txt
+Remove b/2.txt
+Rename a/2.txt to b/2.txt
+
+:b stderr 0
+