Fix stubbing programs that have dashes in them

test/stubs/stub

@@ -3,7 +3,7 @@ set -e
 
 status=0
 program="${0##*/}"
-PROGRAM="$(echo "$program" | tr a-z A-Z)"
+PROGRAM="$(echo "$program" | tr a-z- A-Z_)"
 [ -n "$TMPDIR" ] || TMPDIR="/tmp"
 
 _STUB_PLAN="${PROGRAM}_STUB_PLAN"

test/test_helper.bash

@@ -15,7 +15,7 @@ teardown() {
 
 stub() {
   local program="$1"
-  local prefix="$(echo "$program" | tr a-z A-Z)"
+  local prefix="$(echo "$program" | tr a-z- A-Z_)"
   shift
 
   export "${prefix}_STUB_PLAN"="${TMP}/${program}-stub-plan"
@@ -31,7 +31,7 @@ stub() {
 
 unstub() {
   local program="$1"
-  local prefix="$(echo "$program" | tr a-z A-Z)"
+  local prefix="$(echo "$program" | tr a-z- A-Z_)"
   local path="${TMP}/bin/${program}"
 
   export "${prefix}_STUB_END"=1