tests: set -e -u in shell scripts

Cherry-picked from #1017

tests/gen_keys.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -e
+set -u
 
 # Generate test keys
 

tests/mansyntax.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -e
+set -u
 
 # Written by Mikhail Gusarov
 #

tests/test_read_algos.test

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+set -e
+set -u
+
 # https://testanything.org/tap-specification.html
 
 if [[ "$(uname)" = *'_NT'* ]]; then
@@ -8,7 +11,7 @@ if [[ "$(uname)" = *'_NT'* ]]; then
   exit 0
 fi
 
-testbin="./test_read${EXEEXT}"
+testbin="./test_read${EXEEXT:-}"
 
 d="$(dirname "$0")"
 algos="$(tr -d $"\r" < "${d}/test_read_algos.txt")"

tests/test_sshd.test

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+set -e
+set -u
+
 # https://testanything.org/tap-specification.html
 
 d="$(dirname "$0")"
@@ -25,7 +28,7 @@ total="$(echo "${tests}" | wc -w | tr -d ' ')"
 echo "${count}..${total}"
 
 for test in ${tests}; do
-  if "${d}/sshd_fixture.sh" "./${test}${EXEEXT}"; then
+  if "${d}/sshd_fixture.sh" "./${test}${EXEEXT:-}"; then
     res='ok'
   else
     res='not ok'