Introduce basic js unit tests

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/tests/unit/svgTransform.js

@@ -0,0 +1,14 @@
+const vueJest = require("vue-jest/lib/template-compiler");
+
+module.exports = {
+  process(content) {
+    const { render } = vueJest({
+      content,
+      attrs: {
+        functional: false,
+      },
+    });
+
+    return `module.exports = { render: ${render} }`;
+  },
+};