[pug-linker] Add regression tests for #1261

packages/pug/test/regression-1261/__snapshots__/index.test.js.snap

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+exports[`test #1261 - issue 1 - page with nested append 1`] = `
+"
+<script>console.log(\"page1\");</script>
+<script>console.log(\"page1 in content\");</script>
+<p>page 1</p>"
+`;
+
+exports[`test #1261 - issue 2 - append/prepend in include 1`] = `
+"
+<script>console.log(\"page1\");</script>
+<script>console.log(\"page2\");</script>
+<p>page 1</p>
+<p>page 2</p>"
+`;
+
+exports[`test #1261 - issue 3 - append inside include inside append content 1`] = `
+"
+<script>console.log(\"page1\");</script>
+<script>console.log(\"page2\");</script>
+<p>page 1</p>
+<p>page 2</p>"
+`;

packages/pug/test/regression-1261/index.test.js

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+const pug = require('../../');
+
+// Issue 1: block append in another block append duplicates the content of the inner block append,
+// in different order furthermore.
+test('#1261 - issue 1 - page with nested append', () => {
+  const output = pug.renderFile(
+    __dirname + '/page1-issue1.pug',
+    {pretty: true}
+  );
+  expect(output).toMatchSnapshot();
+});
+
+// Issue 2: append order is not the expected one: page 2 should be after page 1 in both script & content blocks.
+test('#1261 - issue 2 - append/prepend in include', () => {
+  const output = pug.renderFile(
+    __dirname + '/page1-issue2.pug',
+    {pretty: true}
+  );
+  expect(output).toMatchSnapshot();
+});
+
+// Issue 3: block scripts is duplicated like in issue 1, but the order is the same in the two copies...
+test('#1261 - issue 3 - append inside include inside append content', () => {
+  const output = pug.renderFile(
+    __dirname + '/page1-issue3.pug',
+    {pretty: true}
+  );
+  expect(output).toMatchSnapshot();
+});

packages/pug/test/regression-1261/layout.pug

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+block scripts
+
+block content

packages/pug/test/regression-1261/page1-issue1.pug

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+extends ./layout.pug
+
+append scripts
+  script console.log("page1");
+
+append content
+  p page 1
+  append scripts
+    script console.log("page1 in content");

packages/pug/test/regression-1261/page1-issue2.pug

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+extends ./layout.pug
+
+append scripts
+  script console.log("page1");
+
+append content
+  p page 1
+
+include ./page2.pug

packages/pug/test/regression-1261/page1-issue3.pug

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+extends ./layout.pug
+
+append scripts
+  script console.log("page1");
+
+append content
+  p page 1
+  include ./page2.pug

packages/pug/test/regression-1261/page2.pug

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+append scripts
+  script console.log("page2");
+
+append content
+  p page 2