fix(tests): simplify tests

build/webpack.tests.config.js

@@ -0,0 +1,32 @@
+const merge = require("webpack-merge");
+const jetpack = require("fs-jetpack");
+const base = require("./webpack.base.config");
+
+// Test files are scattered through the whole project. Here we're searching
+// for them and generating entry file for webpack.
+
+const testsDir = jetpack.cwd("tests");
+const tempDir = jetpack.cwd("temp");
+const entryFilePath = tempDir.path("testsInit.js");
+
+const testsImports = testsDir
+  .find({ matching: "*.test.js" })
+  .reduce((fileContent, path) => {
+    const normalizedPath = path.replace(/\\/g, "/");
+    return `${fileContent}require("../tests/${normalizedPath}");\n`;
+  }, "");
+
+let entryFileContent = testsDir.read('init.js')
+entryFileContent = entryFileContent.replace('//TESTS', testsImports)
+
+jetpack.write(entryFilePath, entryFileContent);
+
+module.exports = env => {
+  return merge(base(env), {
+    entry: entryFilePath,
+    output: {
+      filename: "tests.js",
+      path: tempDir.path()
+    }
+  });
+};