Add tests for base theme's battery functions

test/themes/base.theme.bats

@@ -0,0 +1,69 @@
+#!/usr/bin/env bats
+
+load ../test_helper
+load ../../lib/composure
+load ../../plugins/available/base.plugin
+load ../../themes/base.theme
+
+@test 'themes base: battery_percentage should not exist' {
+  run type -a battery_percentage &> /dev/null
+  assert_failure
+}
+
+@test 'themes base: battery_percentage should exist if battery plugin loaded' {
+  load ../../plugins/available/battery.plugin
+
+  run type -a battery_percentage &> /dev/null
+  assert_success
+}
+
+@test 'themes base: battery_char should exist' {
+  run type -a battery_char &> /dev/null
+  assert_success
+
+  run battery_char
+  assert_success
+  assert_line "0" ""
+
+  run type -a battery_char
+  assert_line "    echo -n"
+}
+
+@test 'themes base: battery_char should exist if battery plugin loaded' {
+  unset -f battery_char
+  load ../../plugins/available/battery.plugin
+  load ../../themes/base.theme
+
+  run type -a battery_char &> /dev/null
+  assert_success
+
+  run battery_char
+  assert_success
+
+  run type -a battery_char
+  assert_line '    if [[ "${THEME_BATTERY_PERCENTAGE_CHECK}" = true ]]; then'
+}
+
+@test 'themes base: battery_charge should exist' {
+  run type -a battery_charge &> /dev/null
+  assert_success
+
+  run battery_charge
+  assert_success
+  assert_line "0" ""
+}
+
+@test 'themes base: battery_charge should exist if battery plugin loaded' {
+  unset -f battery_charge
+  load ../../plugins/available/battery.plugin
+  load ../../themes/base.theme
+
+  run type -a battery_charge &> /dev/null
+  assert_success
+
+  run battery_charge
+  assert_success
+
+  run type -a battery_charge
+  assert_line '        no)'
+}