Add tests for node_version segment

test/segments/node_version.spec

@@ -0,0 +1,36 @@
+#!/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=$0
+
+function setUp() {
+  export TERM="xterm-256color"
+  # Load Powerlevel9k
+  source powerlevel9k.zsh-theme
+}
+
+function testNodeVersionSegmentPrintsNothingWithoutNode() {
+    local POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(node_version custom_world)
+    local POWERLEVEL9K_CUSTOM_WORLD='echo world'
+    alias node="nonode 2>/dev/null"
+
+    assertEquals "%K{white} %F{black}world %k%F{white}%f " "$(build_left_prompt)"
+
+    unset POWERLEVEL9K_CUSTOM_WORLD
+    unalias node
+}
+
+function testNodeVersionSegmentWorks() {
+    local POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(node_version)
+    node() {
+        echo "v1.2.3"
+    }
+
+    assertEquals "%K{green} %F{white%}⬢ %f%F{white}1.2.3 %k%F{green}%f " "$(build_left_prompt)"
+
+    unfunction node
+}
+
+source shunit2/source/2.1/src/shunit2