fluent-vue
diff --git a/‎__tests__/utils/index.ts
Copy file name to clipboardExpand all lines: __tests__/utils/index.ts
+6-3Lines changed: 6 additions & 3 deletions b/‎__tests__/utils/index.ts
Copy file name to clipboardExpand all lines: __tests__/utils/index.ts
+6-3Lines changed: 6 additions & 3 deletions
diff --git a/‎__tests__/vue/composition.spec.ts
Copy file name to clipboardExpand all lines: __tests__/vue/composition.spec.ts
+25Lines changed: 25 additions & 0 deletions b/‎__tests__/vue/composition.spec.ts
Copy file name to clipboardExpand all lines: __tests__/vue/composition.spec.ts
+25Lines changed: 25 additions & 0 deletions
diff --git a/‎package.json
Copy file name to clipboardExpand all lines: package.json
+1-1Lines changed: 1 addition & 1 deletion b/‎package.json
Copy file name to clipboardExpand all lines: package.json
+1-1Lines changed: 1 addition & 1 deletion
@@ -7,16 +7,18 @@ import type { FluentVue } from '../../src'
 install()
 
 export function mountWithFluent<T>(
-  fluent: FluentVue,
+  fluent: FluentVue | null,
   component: ComponentOptions<T>,
 ): VueWrapper<ComponentPublicInstance<T>> {
   if (isVue3) {
     // eslint-disable-next-line @typescript-eslint/no-var-requires
     const { mount } = require('@vue/test-utils')
 
+    const plugins = fluent ? [fluent] : []
+
     return mount(component, {
       global: {
-        plugins: [fluent],
+        plugins,
       },
     })
   }
@@ -25,7 +27,8 @@ export function mountWithFluent<T>(
     const { createLocalVue, mount } = require('@vue/test-utils')
 
     const localVue = createLocalVue()
-    localVue.use(fluent)
+    if (fluent)
+      localVue.use(fluent)
     return mount(component, {
       localVue,
     })
 
@@ -46,4 +46,29 @@ describe('composition api', () => {
     // Assert
     expect(mounted.html()).toEqual('<a href="/foo" aria-label="Aria label">link text</a>')
   })
+
+  it('thrpws when used outside of setup', () => {
+    // Arrange
+    // Act
+    const use = () => useFluent()
+
+    // Assert
+    expect(use).toThrowError('[fluent-vue] useFluent called outside of setup')
+  })
+
+  it('throws when used without installing plugin', () => {
+    // Arrange
+    const component = {
+      template: '<span></span>',
+      setup() {
+        useFluent()
+      },
+    }
+
+    // Act
+    const mount = () => mountWithFluent(null, component)
+
+    // Asser
+    expect(mount).toThrowError('[fluent-vue] useFluent called without installing plugin')
+  })
 })
@@ -83,7 +83,7 @@
     "@ls-lint/ls-lint": "^1.11.2",
     "@release-it-plugins/lerna-changelog": "^5.0.0",
     "@types/node": "^17.0.10",
-    "@vitest/coverage-c8": "^0.23.4",
+    "@vitest/coverage-istanbul": "^0.24.3",
     "@vue/compiler-sfc": "^3.2.41",
     "@vue/test-utils": "^2.1.0",
     "esbuild-plugin-globals": "^0.1.1",