Added unit tests for resources mixin

packages/web-app-files/tests/unit/mixins/resources.spec.js

@@ -0,0 +1,42 @@
+import resources from '@files/src/mixins/resources.js'
+import { shallowMount } from '@vue/test-utils'
+
+const getWrapper = () => {
+  const Component = {
+    render() {}
+  }
+  return shallowMount(Component, {
+    mixins: [resources]
+  })
+}
+
+describe('resources', () => {
+  describe('getResourcesSize', () => {
+    const wrapper = getWrapper()
+
+    it('should return empty string if size is less than zero', () => {
+      expect(wrapper.vm.getResourceSize(-1)).toEqual('')
+    })
+
+    it('should return "?" if size is not a number', () => {
+      expect(wrapper.vm.getResourceSize('string')).toEqual('?')
+    })
+
+    it.each([
+      { size: '0', expectedSize: '0 B' },
+      { size: '1', expectedSize: '1 B' },
+      { size: '1024', expectedSize: '1 KB' },
+      { size: '1048576', expectedSize: '1 MB' }
+    ])('should return formatted size of given resource', sizeInput => {
+      expect(wrapper.vm.getResourceSize(sizeInput.size)).toEqual(sizeInput.expectedSize)
+    })
+
+    it('should not show round value for size less than a MB', () => {
+      expect(wrapper.vm.getResourceSize('4321')).toEqual('4 KB')
+    })
+
+    it('should show single round value for size larger than a MB', () => {
+      expect(wrapper.vm.getResourceSize('4321000')).toEqual('4.1 MB')
+    })
+  })
+})