[PATCH v2 3/5] test: introduce new x_to_tab() helper function

[Dragan Simic <dsimic@manjaro.org>]

There's nothing wrong with the already existing q_to_tab() function, except
when it's used on strings that contain uppercase letter "Q" in its literal
meaning, which, for example, can happen with git configurations that contain
"*.*Quoted" as the names of their configuration variables.

Thus, let's introduce new x_to_tab() helper function that does pretty much
the same job as the already existing q_to_tab() helper function, except for
replacing "X" with a horizontal tab (HT), instead of replacing "Q".

Signed-off-by: Dragan Simic <dsimic@manjaro.org>
---

Notes:
    This patch didn't exist in the v1 of this patch series.

 t/test-lib-functions.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 6eaf116346be..362d3205b7b0 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -107,6 +107,10 @@ q_to_tab () {
 	tr Q '\011'
 }
 
+x_to_tab () {
+	tr X '\011'
+}
+
 qz_to_tab_space () {
 	tr QZ '\011\040'
 }