test/theme: adopt newly revamped setup()

test/themes/base.theme.bats

@@ -1,8 +1,11 @@
-#!/usr/bin/env bats
+# shellcheck shell=bats
 
-load ../test_helper
-load ../test_helper_libs
-load ../../themes/base.theme
+load "${MAIN_BASH_IT_DIR?}/test/test_helper.bash"
+
+function local_setup_file() {
+  setup_libs "colors" #"theme"
+  load "${BASH_IT?}/themes/base.theme.bash"
+}
 
 @test 'themes base: battery_percentage should not exist' {
   run type -a battery_percentage &> /dev/null
@@ -10,7 +13,7 @@ load ../../themes/base.theme
 }
 
 @test 'themes base: battery_percentage should exist if battery plugin loaded' {
-  load ../../plugins/available/battery.plugin
+  load "${BASH_IT?}/plugins/available/battery.plugin.bash"
 
   run type -a battery_percentage &> /dev/null
   assert_success
@@ -28,12 +31,12 @@ load ../../themes/base.theme
 @test 'themes base: battery_char should exist if battery plugin loaded' {
   unset -f battery_char
 
-  load ../../plugins/available/battery.plugin
+  load "${BASH_IT?}/plugins/available/battery.plugin.bash"
   run type -t battery_percentage
   assert_success
   assert_line "function"
 
-  load ../../themes/base.theme
+  load "${BASH_IT?}/themes/base.theme.bash"
   run type -t battery_char
   assert_success
   assert_line "function"
@@ -51,13 +54,13 @@ load ../../themes/base.theme
 
   run battery_charge
   assert_success
-  assert_line -n 0 ""
+  assert_output ""
 }
 
 @test 'themes base: battery_charge should exist if battery plugin loaded' {
   unset -f battery_charge
-  load ../../plugins/available/battery.plugin
-  load ../../themes/base.theme
+  load "${BASH_IT?}/plugins/available/battery.plugin.bash"
+  load "${BASH_IT?}/themes/base.theme.bash"
 
   run type -a battery_charge &> /dev/null
   assert_success