test util functions

t/util.vim

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+call airline#init#bootstrap()
+
+function! Util1()
+  let g:count += 1
+endfunction
+function! Util2()
+  let g:count += 2
+endfunction
+function! Util3(...)
+  let g:count = a:0
+endfunction
+
+describe 'util'
+  before
+    let g:count = 0
+  end
+
+  it 'has append wrapper function'
+    Expect airline#util#append('') == ''
+    Expect airline#util#append('1') == '  > 1'
+  end
+
+  it 'has prepend wrapper function'
+    Expect airline#util#prepend('') == ''
+    Expect airline#util#prepend('1') == '1 < '
+  end
+
+  it 'has getwinvar function'
+    Expect airline#util#getwinvar(1, '&statusline', 'foo') == getwinvar(1, '&statusline')
+    Expect airline#util#getwinvar(1, 'asdf', '123') == '123'
+  end
+
+  it 'has exec funcrefs helper functions'
+    call airline#util#exec_funcrefs([function('Util1'), function('Util2')])
+    Expect g:count == 3
+
+    call airline#util#exec_funcrefs([function('Util3')], 1, 2, 3, 4)
+    Expect g:count == 4
+  end
+end
+