test: add globalVars test case

e2e/fixtures.umi/config.less.globalVars/.umirc.ts

@@ -0,0 +1,9 @@
+export default {
+  mfsu: false,
+  mako: {},
+  lessLoader: {
+    globalVars: {
+      hack: 'true; @import "./var.less";',
+    },
+  },
+};

e2e/fixtures.umi/config.less.globalVars/expect.js

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+const assert = require("assert");
+const { parseBuildResult, moduleReg } = require("../../../scripts/test-utils");
+const { files } = parseBuildResult(__dirname);
+
+let content = files["pages_index_tsx-async.css"];
+content = content.replace(/\s/g, "");
+
+assert(content.includes(`color:red;`), "should prefer less.modifyVars than config.theme");

e2e/fixtures.umi/config.less.globalVars/pages/index.less

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+a {
+  color: @primaryColor;
+}

e2e/fixtures.umi/config.less.globalVars/pages/index.tsx

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+import React from 'react';
+import './index.less';
+export default () => <div>1</div>;

e2e/fixtures.umi/config.less.globalVars/var.less

@@ -0,0 +1 @@
+@primaryColor: red;