test funcref pipeline.

t/airline.vim

@@ -0,0 +1,46 @@
+call airline#init#bootstrap()
+
+function! MyFuncref(...)
+  call a:1.add_raw('hello world')
+  return 1
+endfunction
+
+function! MyIgnoreFuncref(...)
+  return -1
+endfunction
+
+function! MyAppend1(...)
+  call a:1.add_raw('hello')
+endfunction
+
+function! MyAppend2(...)
+  call a:1.add_raw('world')
+endfunction
+
+describe 'airline'
+  before
+    let g:airline_statusline_funcrefs = []
+  end
+
+  it 'should run user funcrefs first'
+    call airline#add_statusline_func('MyFuncref')
+    let &statusline = ''
+    call airline#update_statusline()
+    Expect &statusline =~ 'hello world'
+  end
+
+  it 'should not change the statusline with -1'
+    call airline#add_statusline_funcref(function('MyIgnoreFuncref'))
+    let &statusline = 'foo'
+    call airline#update_statusline()
+    Expect &statusline == 'foo'
+  end
+
+  it 'should support multiple chained funcrefs'
+    call airline#add_statusline_func('MyAppend1')
+    call airline#add_statusline_func('MyAppend2')
+    call airline#update_statusline()
+    Expect &statusline =~ 'helloworld'
+  end
+end
+