--- /dev/null
+#!/bin/bash
+
+source "$BP_DIR/bp_test/lib/test.sh"
+
+run "write_tab -I $in -o $tmp -x"
+assert_no_diff $tmp $out.1
+rm $tmp
+
+run "write_tab -I $in -c -o $tmp -x"
+assert_no_diff $tmp $out.2
+rm $tmp
+
+run "write_tab -I $in -d ',' -o $tmp -x"
+assert_no_diff $tmp $out.3
+rm $tmp
+
+run "write_tab -I $in -Z -o $tmp.gz -x"
+gunzip $tmp.gz
+assert_no_diff $tmp $out.4
+rm $tmp
+
+run "write_tab -I $in -k 'Count' -o $tmp -x"
+assert_no_diff $tmp $out.5
+rm $tmp
+
+run "write_tab -I $in -K 'Count' -o $tmp -x"
+assert_no_diff $tmp $out.6
+rm $tmp