fix: Less relative path in imports (#475)

Co-authored-by: Lachlan Miller <lachlan.miller.1990@outlook.com>

Author: cmath10

e2e/2.x/style/components/Less.vue

@@ -1,9 +1,18 @@
 <template>
-  <div />
+  <div>
+    <div :class="$style.a">a</div>
+    <div :class="$style.b">b</div>
+    <div :class="$style.c">c</div>
+    <div :class="$style.d">d</div>
+  </div>
 </template>
 
 <style module lang="less">
+@import './styles/less-a.less';
 .a {
   background-color: @primary-color;
 }
+.b {
+  color: @primary-color;
+}
 </style>

e2e/2.x/style/components/styles/less-a.less

@@ -0,0 +1,7 @@
+@import "variables";
+.c {
+  color: @primary-color;
+}
+.d {
+  background-color: @primary-color;
+}

packages/vue2-jest/lib/process-style.js

@@ -45,7 +45,7 @@ function getPreprocessOptions(lang, filePath, jestConfig) {
       })
     }
   }
-  if (lang === 'styl' || lang === 'stylus') {
+  if (lang === 'styl' || lang === 'stylus' || lang === 'less') {
     return {
       paths: [path.dirname(filePath), process.cwd()]
     }