basic tests and travis integration.

t/init.vim

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+for key in ['a', 'b', 'c', 'gutter', 'x', 'y', 'z', 'warning']
+  unlet! g:airline_section_{key}
+endfor
+call airline#init#bootstrap()
+
+describe 'init'
+  it 'section a should have mode, paste, iminsert'
+    Expect g:airline_section_a =~ 'mode'
+    Expect g:airline_section_a =~ 'paste'
+    Expect g:airline_section_a =~ 'iminsert'
+  end
+
+  it 'section b should have hunks and branch'
+    Expect g:airline_section_b =~ 'hunks'
+    Expect g:airline_section_b =~ 'branch'
+  end
+
+  it 'section c should be file'
+    Expect g:airline_section_c == '%<%f%m'
+  end
+
+  it 'section x should be filetype'
+    Expect g:airline_section_x =~ '&filetype'
+  end
+
+  it 'section y should be fenc and ff'
+    Expect g:airline_section_y =~ 'ff'
+    Expect g:airline_section_y =~ 'fenc'
+  end
+
+  it 'section z should be line numbers'
+    Expect g:airline_section_z =~ '%3p%%'
+    Expect g:airline_section_z =~ '%3l'
+    Expect g:airline_section_z =~ '%3c'
+  end
+end
+