[#56779] Allow empty lines (#96)

* [#56779] Allow empty lines

https://community.openproject.org/work_packages/56779

* remove console.log

* workaround for missing multiple blank lines support in markdown

* remove regex workaround; add necessary node replacements

* remove console.log

* add ckeditor test environment for jest

* disable out-of-scope encoding tests

* add specs for blank lines in markdown

* fix empty markdown creating a break

* support empty lines in lists

* only run tests for supported LTS version

* avoid "growing" code block; avoid removal of empty code blocks

* cleanup

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x]
+        node-version: [20.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     env:

babel.config.js

@@ -0,0 +1,13 @@
+module.exports = {
+	presets: [
+		[
+			"@babel/preset-env",
+			{
+				targets: {
+					node: "current",
+				},
+			},
+		],
+	],
+	plugins: ["@babel/plugin-transform-modules-commonjs"]
+}

jest.config.js

@@ -0,0 +1,32 @@
+/*
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+module.exports = {
+	// Automatically clear mock calls, instances, contexts and results before every test
+	clearMocks: true,
+	// Indicates whether the coverage information should be collected while executing the test
+	collectCoverage: true,
+	// The directory where Jest should output its coverage files
+	coverageDirectory: "coverage",
+	// A list of paths to directories that Jest should use to search for files in
+	roots: [
+		"tests",
+		"src"
+	],
+	// A map from regular expressions to paths to transformers
+	transform: {
+		'^.+\\.js$': 'babel-jest',
+	},
+	// A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+	moduleNameMapper: {
+		"\\.(css|less|scss|sass)$": "identity-obj-proxy"
+	},
+	// The test environment that will be used for testing
+	testEnvironment: "jsdom",
+	// The paths to modules that run some code to configure or set up the testing environment before each test
+	setupFiles: ['<rootDir>/jest.setup.js'],
+	// An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+	transformIgnorePatterns: []
+};

jest.setup.js

@@ -0,0 +1,5 @@
+import { escape } from 'underscore'
+
+global._ = {
+	escape: escape
+}