[tests]: Avoid failures when $GROFF_ENCODING set.

* src/roff/groff/tests/ab_works.sh:
* src/roff/groff/tests/handle_special_input_code_points.sh:
* src/roff/groff/tests/initialization_is_quiet.sh:
* src/roff/groff/tests/msoquiet_works.sh:
* src/roff/groff/tests/soquiet_works.sh:
* tmac/tests/an-ext_MR-works.sh:
* tmac/tests/an_MR-works.sh:
* tmac/tests/an_font-remapping-does-not-affect-titles.sh: Unset
  $GROFF_ENCODING before running test because preconv(1) confounds these
  tests.

Thanks to Alexis for reporting this problem.

5 files changed, 15 insertions, 0 deletions

diff --git a/src/roff/groff/tests/ab_works.sh b/src/roff/groff/tests/ab_works.sh
index a1ff78327..589387dcc 100755
--- a/src/roff/groff/tests/ab_works.sh
+++ b/src/roff/groff/tests/ab_works.sh
@@ -25,6 +25,9 @@ groff="${abs_top_builddir:-.}/test-groff"
 # We don't test the X11 devices because groff launches an X client,
 # which has to be killed.  Using "-z" to avoid this masks the bug.
 
+# Keep preconv from being run.
+unset GROFF_ENCODING
+
 for d in ascii cp1047 dvi html latin1 lbp lj4 pdf ps utf8
 do
   echo "verifying exit status of .ab request using $d device" >&2
diff --git a/src/roff/groff/tests/handle_special_input_code_points.sh b/src/roff/groff/tests/handle_special_input_code_points.sh
index 5a064a2af..1e4f9a476 100755
--- a/src/roff/groff/tests/handle_special_input_code_points.sh
+++ b/src/roff/groff/tests/handle_special_input_code_points.sh
@@ -22,6 +22,9 @@ groff="${abs_top_builddir:-.}/test-groff"
 
 # Regression-test Savannah #58962.
 
+# Keep preconv from being run.
+unset GROFF_ENCODING
+
 input='.if " "\~" .tm input no-break space matches \\~
 .if "­"\%" .tm input soft hyphen matches \\%'
 
diff --git a/src/roff/groff/tests/initialization_is_quiet.sh b/src/roff/groff/tests/initialization_is_quiet.sh
index c3ca6c081..ee3070bde 100755
--- a/src/roff/groff/tests/initialization_is_quiet.sh
+++ b/src/roff/groff/tests/initialization_is_quiet.sh
@@ -27,6 +27,9 @@ set -e
 # groff should start up in any supported locale, in compatibility mode
 # or not, without producing diagnostics.
 
+# Keep preconv from being run.
+unset GROFF_ENCODING
+
 for COMPAT in "" -C
 do
   for LOCALE in cs de en fr it ja sv zh
diff --git a/src/roff/groff/tests/msoquiet_works.sh b/src/roff/groff/tests/msoquiet_works.sh
index c232a1bef..bb86427bd 100755
--- a/src/roff/groff/tests/msoquiet_works.sh
+++ b/src/roff/groff/tests/msoquiet_works.sh
@@ -22,6 +22,9 @@ groff="${abs_top_builddir:-.}/test-groff"
 
 set -e
 
+# Keep preconv from being run.
+unset GROFF_ENCODING
+
 DOC='.msoquiet nonexistent'
 
 OUTPUT=$(echo "$DOC" | "$groff" -Tascii 2>&1)
diff --git a/src/roff/groff/tests/soquiet_works.sh b/src/roff/groff/tests/soquiet_works.sh
index 8e8d71e71..50112cfdc 100755
--- a/src/roff/groff/tests/soquiet_works.sh
+++ b/src/roff/groff/tests/soquiet_works.sh
@@ -22,6 +22,9 @@ groff="${abs_top_builddir:-.}/test-groff"
 
 set -e
 
+# Keep preconv from being run.
+unset GROFF_ENCODING
+
 DOC='.soquiet nonexistent'
 
 OUTPUT=$(echo "$DOC" | "$groff" -Tascii 2>&1)