Add tests for `go_version`

.travis.yml

@@ -23,4 +23,5 @@ script:
   - test/functions/colors.spec
   - test/segments/dir.spec
   - test/segments/rust_version.spec
+  - test/segments/go_version.spec
 

test/segments/go_version.spec

@@ -0,0 +1,40 @@
+#!/usr/bin/env zsh
+#vim:ft=zsh ts=2 sw=2 sts=2 et fenc=utf-8
+
+# Required for shunit2 to run correctly
+setopt shwordsplit
+SHUNIT_PARENT=$0
+
+function setUp() {
+  export TERM="xterm-256color"
+  # Load Powerlevel9k
+  source powerlevel9k.zsh-theme
+}
+
+function mockGo() {
+  echo 'go version go1.5.3 darwin/amd64'
+}
+
+function testGo() {
+  alias go=mockGo
+  POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(go_version)
+
+  assertEquals "%K{green} %F{255}go1.5.3 %k%F{green}%f " "$(build_left_prompt)"
+
+  unset POWERLEVEL9K_LEFT_PROMPT_ELEMENTS
+  unalias go
+}
+
+function testGoSegmentPrintsNothingIfGoIsNotAvailable() {
+  alias go=noGo
+  POWERLEVEL9K_CUSTOM_WORLD='echo world'
+  POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(custom_world go_version)
+
+  assertEquals "%K{white} %F{black}world %k%F{white}%f " "$(build_left_prompt)"
+
+  unset POWERLEVEL9K_LEFT_PROMPT_ELEMENTS
+  unset POWERLEVEL9K_CUSTOM_WORLD
+  unalias go
+}
+
+source shunit2/source/2.1/src/shunit2