Adding unit tests for 'each .. of'

packages/pug/test/eachOf/__snapshots__/index.test.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Proper Usage Brackets 1`] = `"<li>a</li><li>b</li><li>foo</li><li>bar</li>"`;
+
+exports[`Proper Usage No Brackets 1`] = `"<li>a</li><li>b</li><li>foo</li><li>bar</li>"`;

packages/pug/test/eachOf/error/left-side.pug

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+each [key, val of users
+  li= key
+  li= val

packages/pug/test/eachOf/error/no-brackets.pug

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+each key, val of users
+  li= key
+  li= val

packages/pug/test/eachOf/error/one-val.pug

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+each [key] of users
+  li= key
+  li= val

packages/pug/test/eachOf/error/right-side.pug

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+each key, val] of users
+  li= key
+  li= val

packages/pug/test/eachOf/index.test.js

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+const pug = require('../../');
+
+describe('Inproper Usage', () => {
+  test('Only left-side bracket', () => {
+    expect(
+      () => pug.compileFile(
+        __dirname + '/error/left-side.pug'
+      )
+    ).toThrow('The value variable for each must either be a valid identifier (e.g. `item`) or a pair of identifiers in square brackets (e.g. `[key, value]`).');
+  })
+  test('Only right-side bracket', () => {
+    expect(
+      () => pug.compileFile(
+        __dirname + '/error/right-side.pug'
+      )
+    ).toThrow('The value variable for each must either be a valid identifier (e.g. `item`) or a pair of identifiers in square brackets (e.g. `[key, value]`).');
+  })
+  test('Only one value inside brackets', () => {
+    expect(
+      () => pug.compileFile(
+        __dirname + '/error/one-val.pug'
+      )
+    ).toThrow('The value variable for each must either be a valid identifier (e.g. `item`) or a pair of identifiers in square brackets (e.g. `[key, value]`).');
+  })
+  test('No brackets', () => {
+    expect(
+      () => pug.compileFile(
+        __dirname + '/error/no-brackets.pug'
+      )
+    ).toThrow('The value variable for each must either be a valid identifier (e.g. `item`) or a pair of identifiers in square brackets (e.g. `[key, value]`).');
+  })
+})
+describe('Proper Usage', () => {
+  test('Brackets', () => {
+    const html = pug.renderFile(
+      __dirname + '/passing/brackets.pug',
+      {
+        users: new Map([['a', 'b'], ['foo', 'bar']])
+      }
+    )
+    expect(html).toMatchSnapshot();
+  })
+  test('No Brackets', () => {
+    const html = pug.renderFile(
+      __dirname + '/passing/no-brackets.pug',
+      {
+        users: new Map([['a', 'b'], ['foo', 'bar']])
+      }
+    )
+    expect(html).toMatchSnapshot();
+  })
+})

packages/pug/test/eachOf/passing/brackets.pug

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+each [key, val] of users
+  li= key
+  li= val

packages/pug/test/eachOf/passing/no-brackets.pug

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+each data of users
+  li= data[0]
+  li= data[1]