hush testsuite: add many tests from ash testsuite

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-standalone/noexec_gets_no_env.right b/shell/hush_test/hush-standalone/noexec_gets_no_env.right
new file mode 100644
index 0000000..8522dff
--- /dev/null
+++ b/shell/hush_test/hush-standalone/noexec_gets_no_env.right
@@ -0,0 +1,4 @@
+VAR7=VAL
+0
+VAR8=VAL
+0
diff --git a/shell/hush_test/hush-standalone/noexec_gets_no_env.tests b/shell/hush_test/hush-standalone/noexec_gets_no_env.tests
new file mode 100755
index 0000000..0d347bd
--- /dev/null
+++ b/shell/hush_test/hush-standalone/noexec_gets_no_env.tests
@@ -0,0 +1,5 @@
+export VAR7=VAL
+env | grep ^VAR7=
+echo $?
+VAR8=VAL env | grep ^VAR8=
+echo $?
diff --git a/shell/hush_test/hush-standalone/nofork_trashes_getopt.right b/shell/hush_test/hush-standalone/nofork_trashes_getopt.right
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/shell/hush_test/hush-standalone/nofork_trashes_getopt.right
@@ -0,0 +1 @@
+0
diff --git a/shell/hush_test/hush-standalone/nofork_trashes_getopt.tests b/shell/hush_test/hush-standalone/nofork_trashes_getopt.tests
new file mode 100755
index 0000000..f42c507
--- /dev/null
+++ b/shell/hush_test/hush-standalone/nofork_trashes_getopt.tests
@@ -0,0 +1,6 @@
+# In this test, rm is NOFORK and it modifies getopt internal state
+rm -f non_existent_file
+# Subsequent hexdump is run as NOEXEC, and thus still uses this state
+hexdump </dev/null
+# Did hexdump segfault etc?
+echo $?
diff --git a/shell/hush_test/hush-standalone/var_standalone1.right b/shell/hush_test/hush-standalone/var_standalone1.right
new file mode 100644
index 0000000..37457fd
--- /dev/null
+++ b/shell/hush_test/hush-standalone/var_standalone1.right
@@ -0,0 +1 @@
+Done: 1
diff --git a/shell/hush_test/hush-standalone/var_standalone1.tests b/shell/hush_test/hush-standalone/var_standalone1.tests
new file mode 100755
index 0000000..1e905ba
--- /dev/null
+++ b/shell/hush_test/hush-standalone/var_standalone1.tests
@@ -0,0 +1,2 @@
+VAR=42 $THIS_SH -c 'unset VAR; env | grep ^VAR'
+echo Done: $?