first commit

config/jest/cssTransform.js

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+'use strict';
+
+// This is a custom Jest transformer turning style imports into empty objects.
+// http://facebook.github.io/jest/docs/en/webpack.html
+
+module.exports = {
+  process() {
+    return 'module.exports = {};';
+  },
+  getCacheKey() {
+    // The output is always the same.
+    return 'cssTransform';
+  },
+};

config/jest/fileTransform.js

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+'use strict';
+
+const path = require('path');
+
+// This is a custom Jest transformer turning file imports into filenames.
+// http://facebook.github.io/jest/docs/en/webpack.html
+
+module.exports = {
+  process(src, filename) {
+    const assetFilename = JSON.stringify(path.basename(filename));
+
+    if (filename.match(/\.svg$/)) {
+      return `const React = require('react');
+      module.exports = {
+        __esModule: true,
+        default: ${assetFilename},
+        ReactComponent: React.forwardRef((props, ref) => ({
+          $$typeof: Symbol.for('react.element'),
+          type: 'svg',
+          ref: ref,
+          key: null,
+          props: Object.assign({}, props, {
+            children: ${assetFilename}
+          })
+        })),
+      };`;
+    }
+
+    return `module.exports = ${assetFilename};`;
+  },
+};