legacy tests: migrate test54

test/functional/legacy/054_buffer_local_autocommands_spec.lua

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+-- Some tests for buffer-local autocommands
+
+local helpers = require('test.functional.helpers')
+local clear, execute, eq = helpers.clear, helpers.execute, helpers.eq
+local curbuf_contents = helpers.curbuf_contents
+
+describe('BufLeave <buffer>', function()
+  setup(clear)
+
+  it('is working', function()
+    execute('w! xx')
+    execute('au BufLeave <buffer> norm Ibuffer-local autocommand')
+    execute('au BufLeave <buffer> update')
+    
+    -- Here, autocommand for xx shall append a line
+    -- But autocommand shall not apply to buffer named <buffer> 
+    execute('e somefile')
+
+    -- Here, autocommand shall be auto-deleted
+    execute('bwipe xx')
+    
+    -- Nothing shall be written
+    execute('e xx')
+    execute('e somefile')
+    execute('e xx')
+
+    eq('buffer-local autocommand', curbuf_contents())
+  end)
+
+  teardown(function()
+    os.remove('xx')
+  end)
+end)