Check prerequisites in install.sh

spec/isPlistBuddyInstalled_spec.sh

@@ -0,0 +1,26 @@
+Describe 'isPlistBuddyInstalled'
+  Include ./install.sh
+
+  It 'returns success if PlistBuddy path exists' 
+    test() { [ "$1" = "-x" ] && return }
+    When call isPlistBuddyInstalled
+    The output should eq ''
+    The status should be success
+  End
+
+  It 'returns success if PlistBuddy is in PATH' 
+    test() { [ "$1" = "-x" ] && return 1 }
+    which() { [ "$1" = "PlistBuddy" ] && return }
+    When call isPlistBuddyInstalled
+    The output should eq ''
+    The status should be success
+  End
+
+  It 'returns failure if PlistBuddy neither is in Path nor at usual path' 
+    test() { [ "$1" = "-x" ] && return 1 }
+    which() { [ "$1" = "PlistBuddy" ] && return 1 }
+    When call isPlistBuddyInstalled
+    The output should eq ''
+    The status should be failure
+  End
+End