add go plugin tests and update list reversal logic

plugins/available/go.plugin.bash

@@ -6,9 +6,16 @@ about-plugin 'go environment variables & path configuration'
 [ ! command -v go &>/dev/null ] && return
 
 function _split_path_reverse() {
+  local a=( ${@//:/ } )
+  local i=${#a[@]}
   local r=
-  for p in ${@//:/ } ; do
-    r="$p $r"
+  while [ $i -gt 0 ] ; do
+    i=$(( i - 1 ))
+    if [ $(( i + 1 )) -eq ${#a[@]} ] ; then
+      r="${a[i]}"
+    else
+      r="${r} ${a[i]}"
+    fi
   done
   echo "$r"
 }

test/plugins/go.plugin.bats

@@ -0,0 +1,37 @@
+#!/usr/bin/env bats
+
+#load ../test_helper
+load ../../lib/helpers
+load ../../lib/composure
+load ../../plugins/available/go.plugin
+
+@test 'plugins go: reverse path: single entry' {
+  run _split_path_reverse '/foo'
+  echo "output = ${output}"
+  [ "$output" = "/foo" ]
+}
+
+@test 'plugins go: reverse path: single entry, colon empty' {
+  run _split_path_reverse '/foo:'
+  echo "output = ${output}"
+  [ "$output" = "/foo" ]
+}
+
+@test 'plugins go: reverse path: single entry, colon whitespace' {
+  run _split_path_reverse '/foo: '
+  echo "output = ${output}"
+  [ "$output" = "/foo" ]
+}
+
+@test 'plugins go: reverse path: multiple entries' {
+  run _split_path_reverse '/foo:/bar'
+  echo "output = ${output}"
+  [ "$output" = "/bar /foo" ]
+}
+
+@test 'plugins go: multiple entries in GOPATH' {
+  export GOPATH="/foo:/bar"
+  load ../../plugins/available/go.plugin
+  echo "$(echo $PATH | cut -d':' -f1,2)"
+  [ "$(echo $PATH | cut -d':' -f1,2)" = "/foo/bin:/bar/bin" ]
+}