Add simple test cases for x, g and G with empty hold space

Author: LoukasPap

tests/by-util/test_sed.rs

@@ -352,7 +352,7 @@ check_output!(trans_no_new_line, ["-e", r"y/l/L/", NO_NEW_LINE]);
 check_output!(trans_newline, ["-e", r"1N;2y/\n/X/", LINES1]);
 
 ////////////////////////////////////////////////////////////
-// Pattern space manipulation: D, d, H, h, N, n, P, p, q, x
+// Pattern space manipulation: D, d, H, h, N, n, P, p, q, x, g, G
 check_output!(pattern_print_to_newline, ["-n", r"1{;N;P;P;p;}", LINES1]);
 check_output!(pattern_next_print, ["-n", r"N;N;P", LINES1]);
 check_output!(pattern_delete_to_newline, ["-n", r"2N;3p;3D;3p", LINES1]);
@@ -371,6 +371,9 @@ check_output!(
     pattern_hold_append_swap,
     ["-e", r"2h;3H;4g;5G;6x;6p;6x;6p", LINES1]
 );
+check_output!(pattern_swap_empty_hold, ["-e", r"4x", LINES1]);
+check_output!(pattern_replace_empty_hold, ["-e", r"4g;5g", LINES1]);
+check_output!(pattern_replace_append_empty_hold, ["-e", r"4G;5G", LINES1]);
 check_output!(pattern_next_output, ["-e", r"4n", LINES1]);
 check_output!(pattern_next_no_output, ["-n", "-e", r"4n", LINES1]);
 check_output!(pattern_next_print_output, ["-e", r"4n;p", LINES1]);

tests/fixtures/sed/output/pattern_replace_append_empty_hold

@@ -0,0 +1,16 @@
+l1_1
+l1_2
+l1_3
+l1_4
+
+l1_5
+
+l1_6
+l1_7
+l1_8
+l1_9
+l1_10
+l1_11
+l1_12
+l1_13
+l1_14

tests/fixtures/sed/output/pattern_replace_empty_hold

@@ -0,0 +1,14 @@
+l1_1
+l1_2
+l1_3
+
+
+l1_6
+l1_7
+l1_8
+l1_9
+l1_10
+l1_11
+l1_12
+l1_13
+l1_14

tests/fixtures/sed/output/pattern_swap_empty_hold

@@ -0,0 +1,14 @@
+l1_1
+l1_2
+l1_3
+
+l1_5
+l1_6
+l1_7
+l1_8
+l1_9
+l1_10
+l1_11
+l1_12
+l1_13
+l1_14