Add tests for laravel version segment to travis

.travis.yml

@@ -29,3 +29,4 @@ script:
   - test/segments/go_version.spec
   - test/segments/vcs.spec
   - test/segments/kubecontext.spec
+  - test/segments/laravel_version.spec

test/segments/laravel_version.spec

@@ -0,0 +1,69 @@
+#!/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 mockLaravelVersion() {
+  case "$1" in
+    "artisan")
+      echo "Laravel Framework version 5.4.23"
+      ;;
+    default)
+  esac
+}
+
+function mockNoLaravelVersion() {
+  # This should output some error
+  >&2 echo "Artisan not available"
+  return 1
+}
+
+function testLaravelVersionSegment() {
+  alias php=mockLaravelVersion
+  POWERLEVEL9K_LARAVEL_ICON='x'
+  POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(laravel_version)
+
+  assertEquals "%K{001} %F{white%}x%f %F{white}5.4.23 %k%F{maroon}%f " "$(build_left_prompt)"
+
+  unset POWERLEVEL9K_LEFT_PROMPT_ELEMENTS
+  unset POWERLEVEL9K_LARAVEL_ICON
+  unalias php
+}
+
+function testLaravelVersionSegmentIfArtisanIsNotAvailable() {
+  alias php=mockNoLaravelVersion
+  POWERLEVEL9K_CUSTOM_WORLD='echo world'
+  POWERLEVEL9K_LARAVEL_ICON='x'
+  POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(custom_world laravel_version)
+
+  assertEquals "%K{white} %F{black}world %k%F{white}%f " "$(build_left_prompt)"
+
+  unset POWERLEVEL9K_LEFT_PROMPT_ELEMENTS
+  unset POWERLEVEL9K_LARAVEL_ICON
+  unset POWERLEVEL9K_CUSTOM_WORLD
+  unalias php
+}
+
+function testLaravelVersionSegmentPrintsNothingIfPhpIsNotAvailable() {
+  alias php=noPhp
+  POWERLEVEL9K_CUSTOM_WORLD='echo world'
+  POWERLEVEL9K_LARAVEL_ICON='x'
+  POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(custom_world laravel_version)
+
+  assertEquals "%K{white} %F{black}world %k%F{white}%f " "$(build_left_prompt)"
+
+  unset POWERLEVEL9K_LEFT_PROMPT_ELEMENTS
+  unset POWERLEVEL9K_LARAVEL_ICON
+  unset POWERLEVEL9K_CUSTOM_WORLD
+  unalias php
+}
+
+source shunit2/source/2.1/src/shunit2