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assets/chart/karma.conf.js

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+/* eslint-env es6 */
+
+const commonjs = require('rollup-plugin-commonjs');
+const istanbul = require('rollup-plugin-istanbul');
+const resolve = require('rollup-plugin-node-resolve');
+const builds = require('./rollup.config');
+
+module.exports = function(karma) {
+	const args = karma.args || {};
+
+	// Use the same rollup config as our dist files: when debugging (--watch),
+	// we will prefer the unminified build which is easier to browse and works
+	// better with source mapping. In other cases, pick the minified build to
+	// make sure that the minification process (terser) doesn't break anything.
+	const regex = args.watch ? /Chart\.js$/ : /Chart\.min\.js$/;
+	const build = builds.filter(v => v.output.file.match(regex))[0];
+
+	if (args.watch) {
+		build.output.sourcemap = 'inline';
+	}
+
+	karma.set({
+		frameworks: ['jasmine'],
+		reporters: ['progress', 'kjhtml'],
+		browsers: ['chrome', 'firefox'],
+		logLevel: karma.LOG_WARN,
+
+		// Explicitly disable hardware acceleration to make image
+		// diff more stable when ran on Travis and dev machine.
+		// https://github.com/chartjs/Chart.js/pull/5629
+		customLaunchers: {
+			chrome: {
+				base: 'Chrome',
+				flags: [
+					'--disable-accelerated-2d-canvas'
+				]
+			},
+			firefox: {
+				base: 'Firefox',
+				prefs: {
+					'layers.acceleration.disabled': true
+				}
+			}
+		},
+
+		files: [
+			{pattern: 'test/fixtures/**/*.js', included: false},
+			{pattern: 'test/fixtures/**/*.json', included: false},
+			{pattern: 'test/fixtures/**/*.png', included: false},
+			'node_modules/moment/min/moment.min.js',
+			'test/index.js',
+			'src/index.js'
+		].concat(args.inputs),
+
+		preprocessors: {
+			'test/index.js': ['rollup'],
+			'src/index.js': ['sources']
+		},
+
+		rollupPreprocessor: {
+			plugins: [
+				resolve(),
+				commonjs()
+			],
+			output: {
+				name: 'test',
+				format: 'umd'
+			}
+		},
+
+		customPreprocessors: {
+			sources: {
+				base: 'rollup',
+				options: build
+			}
+		},
+
+		// These settings deal with browser disconnects. We had seen test flakiness from Firefox
+		// [Firefox 56.0.0 (Linux 0.0.0)]: Disconnected (1 times), because no message in 10000 ms.
+		// https://github.com/jasmine/jasmine/issues/1327#issuecomment-332939551
+		browserDisconnectTolerance: 3
+	});
+
+	// https://swizec.com/blog/how-to-run-javascript-tests-in-chrome-on-travis/swizec/6647
+	if (process.env.TRAVIS) {
+		karma.customLaunchers.chrome.flags.push('--no-sandbox');
+	}
+
+	if (args.coverage) {
+		karma.reporters.push('coverage');
+		karma.coverageReporter = {
+			dir: 'coverage/',
+			reporters: [
+				{type: 'html', subdir: 'html'},
+				{type: 'lcovonly', subdir: '.'}
+			]
+		};
+		[
+			karma.rollupPreprocessor,
+			karma.customPreprocessors.sources.options
+		].forEach(v => {
+			(v.plugins || (v.plugins = [])).unshift(
+				istanbul({
+					include: 'src/**/*.js'
+				}));
+		});
+	}
+};