FIX problems when LANG is undefined

Author: Pascal Grange

README.adoc

@@ -108,6 +108,7 @@ Running tests in tests/test_core.sh
 	Running test_fake_echo_stdin_when_no_params ... SUCCESS
 	Running test_fake_exports_faked_in_subshells ... SUCCESS
 	Running test_fake_transmits_params_to_fake_code ... SUCCESS
+	Running test_should_pretty_format_even_when_LANG_is_unset ... SUCCESS
 Overall result: SUCCESS
 ```
 
@@ -166,6 +167,7 @@ ok - test_fake_can_fake_inline
 ok - test_fake_echo_stdin_when_no_params
 ok - test_fake_exports_faked_in_subshells
 ok - test_fake_transmits_params_to_fake_code
+ok - test_should_pretty_format_even_when_LANG_is_unset
 ```
 
 == How to write tests

bash_unit

@@ -233,9 +233,10 @@ pretty_failure() {
 pretty_format() {
   local color="$1"
   local pretty_symbol="$2"
-  local alt_symbol="$3"
+  local alt_symbol="${3:-}"
   local term_utf8=false
-  if is_terminal && [[ "$LANG" =~ .*UTF-8.* ]]
+#env
+  if is_terminal && [[ "${LANG:-}" =~ .*UTF-8.* ]]
   then
     term_utf8=true
   fi
@@ -270,7 +271,7 @@ color() {
 }
 
 is_terminal() {
-  [ -t 1 ] || [[ "${FORCE_COLOR}" == true ]]
+  [ -t 1 ] || [[ "${FORCE_COLOR:-}" == true ]]
 }
 
 text_format() {

tests/test_core.sh

@@ -138,6 +138,12 @@ EOF
   assert_equals 2 $(ps | "$GREP" pts | wc -l)
 }
 
+test_should_pretty_format_even_when_LANG_is_unset() {
+  # See https://github.com/pgrange/bash_unit/pull/81
+  unset LANG
+  assert "echo foo | pretty_format GREEN I"
+}
+
 if [[ "${STICK_TO_CWD}" != true ]]
 then
   # do not test for cwd if STICK_TO_CWD is true