Replace airline with lightline (much better perfomance)

sources_non_forked/lightline.vim/test/tabline.vim

@@ -0,0 +1,67 @@
+let s:suite = themis#suite('tabline')
+let s:assert = themis#helper('assert')
+
+function! s:suite.before_each()
+  let g:lightline = {}
+  call lightline#init()
+  tabnew
+  tabonly
+endfunction
+
+function! s:suite.tabline()
+  call s:assert.equals(&tabline, '%!lightline#tabline()')
+endfunction
+
+function! s:suite.enabled()
+  let g:lightline = { 'enable': { 'tabline': 1 } }
+  call lightline#init()
+  call s:assert.equals(&tabline, '%!lightline#tabline()')
+endfunction
+
+function! s:suite.disabled()
+  let g:lightline = { 'enable': { 'tabline': 0 } }
+  call lightline#init()
+  call s:assert.equals(&tabline, '')
+endfunction
+
+function! s:suite.tabnew()
+  let tabline = lightline#tabline()
+  tabnew
+  call s:assert.not_equals(lightline#tabline(), tabline)
+endfunction
+
+function! s:suite.tabnew_first()
+  let tabline = lightline#tabline()
+  0tabnew
+  call s:assert.not_equals(lightline#tabline(), tabline)
+endfunction
+
+function! s:suite.tabnext()
+  tabnew
+  let tabline = lightline#tabline()
+  tabnext
+  call s:assert.not_equals(lightline#tabline(), tabline)
+endfunction
+
+function! s:suite.tabonly()
+  tabnew
+  tabfirst
+  let tabline = lightline#tabline()
+  tabonly
+  call s:assert.not_equals(lightline#tabline(), tabline)
+endfunction
+
+function! s:suite.tabclose()
+  tabnew
+  let tabline = lightline#tabline()
+  tabclose
+  call s:assert.not_equals(lightline#tabline(), tabline)
+endfunction
+
+function! s:suite.tabclose_last()
+  tabnew
+  tabfirst
+  let tabline = lightline#tabline()
+  $tabclose
+  call s:assert.not_equals(lightline#tabline(), tabline)
+endfunction