test(cases): multiple entry points ordering

test/cases/multiple-entries-second/a.js

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+require('./a.txt');
+require('./b.txt');
+require('./c.txt');

test/cases/multiple-entries-second/a.txt

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+a

test/cases/multiple-entries-second/b.js

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+require('./b.txt');
+require('./a.txt');

test/cases/multiple-entries-second/b.txt

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+b

test/cases/multiple-entries-second/c.txt

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+c

test/cases/multiple-entries-second/expected/a.txt

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+a
+b
+c

test/cases/multiple-entries-second/expected/b.txt

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+b
+a

test/cases/multiple-entries-second/webpack.config.js

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+import ExtractTextPlugin from '../../../src/index';
+
+module.exports = {
+  entry: {
+    a: './a',
+    b: './b',
+  },
+  plugins: [
+    new ExtractTextPlugin('[name].txt'),
+  ],
+};