test: improve coverage

packages/runtime-dom/src/helpers/useCssModule.ts

@@ -2,10 +2,11 @@ import { warn, getCurrentInstance } from '@vue/runtime-core'
 import { EMPTY_OBJ } from '@vue/shared'
 
 export function useCssModule(name = '$style'): Record<string, string> {
+  /* istanbul ignore else */
   if (!__GLOBAL__) {
     const instance = getCurrentInstance()!
     if (!instance) {
-      __DEV__ && warn(`useCSSModule must be called inside setup()`)
+      __DEV__ && warn(`useCssModule must be called inside setup()`)
       return EMPTY_OBJ
     }
     const modules = instance.type.__cssModules
@@ -22,7 +23,7 @@ export function useCssModule(name = '$style'): Record<string, string> {
     return mod as Record<string, string>
   } else {
     if (__DEV__) {
-      warn(`useCSSModule() is not supported in the global build.`)
+      warn(`useCssModule() is not supported in the global build.`)
     }
     return EMPTY_OBJ
   }

packages/runtime-dom/src/helpers/useCssVars.ts

@@ -14,6 +14,7 @@ export function useCssVars(
   scoped = false
 ) {
   const instance = getCurrentInstance()
+  /* istanbul ignore next */
   if (!instance) {
     __DEV__ &&
       warn(`useCssVars is called without current active component instance.`)