Fix button inconsistencies and macOS layout shifts

This commit fixes layout shifts experienced in macOS Safari when
hovering over top menu items. Instead of making text bold — which was
causing layout shifts — the hover effect now changes the text color.
This ensures a consistent UI across different browsers and platforms.

Additionally, this commit fixes the styling of the privacy button
located in the bottom right corner. Previously styled as an `<a>`
element, it is now correctly represented as a `<button>`.

Furthermore, the commit enhances HTML conformity and accessibility by
correctly using `<button>` and `<a>` tags instead of relying on click
interactions on `<span>` elements.

This commit introduces `FlatButton` Vue component and a new
`flat-button` mixin. These centralize button usage and link styles,
aligning the hover/touch reactions of buttons across the application,
thereby creating a more consistent user interface.

docs/presentation.md

@@ -79,14 +79,15 @@ To add a new dependency:
 
 ## Shared UI components
 
-Shared UI components promote consistency and simplifies the creation of the front-end.
+Shared UI components ensure consistency and streamline front-end development.
 
-In order to maintain portability and easy maintainability, the preference is towards using homegrown components over third-party ones or comprehensive UI frameworks like Quasar.
+We use homegrown components over third-party solutions or comprehensive UI frameworks like Quasar to maintain portability and easy maintenance.
 
 Shared components include:
 
-- [ModalDialog.vue](./../src/presentation/components/Shared/Modal/ModalDialog.vue) is utilized for rendering modal windows.
+- [ModalDialog.vue](./../src/presentation/components/Shared/Modal/ModalDialog.vue): Renders modal windows.
-- [TooltipWrapper.vue](./../src/presentation/components/Shared/TooltipWrapper.vue) acts as a wrapper for rendering tooltips.
+- [TooltipWrapper.vue](./../src/presentation/components/Shared/TooltipWrapper.vue): Provides tooltip functionality for improved information accessibility.
+- [FlatButton.vue](./../src/presentation/components/Shared/FlatButton.vue): Creates flat-style buttons for a unified and consistent user interface.
 
 ## Desktop builds
 

src/presentation/assets/styles/_colors.scss

@@ -30,7 +30,6 @@ $color-on-surface           : #4d5156;
 // Background | Appears behind scrollable content.
 $color-background           : #e6ecf4;
 
-
 /*
     Application-specific colors:
     These are tailored to the specific needs of the application and derived from the above theme colors.
@@ -38,3 +37,4 @@ $color-background           : #e6ecf4;
     This approach maintains a cohesive look and feel and simplifies theme adjustments.
 */
 $color-scripts-bg: $color-primary-darker;
+$color-highlight: $color-primary;

src/presentation/assets/styles/_globals.scss

@@ -11,14 +11,10 @@
     box-sizing: border-box;
 }
 
-$globals-color-hover: $color-primary;
 a {
-    color:inherit;
+    color: inherit;
-    text-decoration: underline;
     cursor: pointer;
-    @include hover-or-touch {
+    @include flat-button($disabled: false);
-        color: $globals-color-hover;
-    }
 }
 
 body {

src/presentation/assets/styles/_mixins.scss

@@ -1,3 +1,5 @@
+@use "@/presentation/assets/styles/colors" as *;
+
 @mixin hover-or-touch($selector-suffix: '', $selector-prefix: '&') {
   @media (hover: hover) {
     /*
@@ -65,3 +67,47 @@
   padding: 0;
   list-style: none;
 }
+
+@mixin reset-button {
+  margin: 0;
+  padding-block: 0;
+  padding-inline: 0;
+  font: unset;
+  border: unset;
+  background: unset;
+  align-items: unset;
+  text-align: unset;
+  text-shadow: unset;
+  text-rendering: unset;
+  color: inherit;
+  writing-mode: unset;
+  letter-spacing: unset;
+  word-spacing: unset;
+  line-height: unset;
+  text-transform: unset;
+  text-indent: unset;
+  appearance: unset;
+  cursor: unset;
+}
+
+@mixin flat-button($disabled: false) {
+  @include reset-button;
+
+  @if $disabled {
+    color: $color-primary-light;
+  } @else {
+    color: inherit;
+    @include clickable;
+    @include hover-or-touch {
+      text-decoration: underline;
+      color: $color-highlight;
+      /*
+        Using color change and underlining and as hover cues instead of bold text,
+        due to inconsistent bold rendering in macOS browsers:
+          - Safari: Renders bold, causes layout shift.
+          - Firefox: Renders bold correctly, no layout shift.
+          - Chromium-based browsers (including Electron app): Do not render bold, no layout shift.
+      */
+    }
+  }
+}

src/presentation/components/Code/CodeButtons/IconButton.vue

@@ -64,6 +64,8 @@ export default defineComponent({
 }
 
 .button {
+  @include reset-button;
+
   display: flex;
   align-items: center;
   justify-content: center;
@@ -72,13 +74,13 @@ export default defineComponent({
   color: $color-on-secondary;
 
   border: none;
-  padding:20px;
+  padding: 20px;
   transition-duration: 0.4s;
   overflow: hidden;
   box-shadow: 0 3px 9px $color-primary-darkest;
   border-radius: 4px;
 
-  &__icon {
+  .button__icon {
     font-size: 2em;
   }
 

src/presentation/components/Code/CodeButtons/Save/Instructions/CodeInstruction.vue

@@ -4,11 +4,7 @@
     <code ref="codeElement"><slot /></code>
     <div class="copy-action-container">
       <TooltipWrapper>
-        <AppIcon
+        <FlatButton icon="copy" @click="copyCode" />
-          icon="copy"
-          class="copy-button"
-          @click="copyCode"
-        />
         <template #tooltip>
           Copy
         </template>
@@ -20,13 +16,13 @@
 <script lang="ts">
 import { defineComponent, shallowRef } from 'vue';
 import TooltipWrapper from '@/presentation/components/Shared/TooltipWrapper.vue';
-import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
 import { injectKey } from '@/presentation/injectionSymbols';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 
 export default defineComponent({
   components: {
     TooltipWrapper,
-    AppIcon,
+    FlatButton,
   },
   setup() {
     const { copyText } = injectKey((keys) => keys.useClipboard);
@@ -73,12 +69,6 @@ export default defineComponent({
   .copy-action-container {
     margin-left: 1rem;
   }
-  .copy-button {
-    @include clickable;
-    @include hover-or-touch {
-      color: $color-primary;
-    }
-  }
   code {
     font-size: 1rem;
   }

src/presentation/components/DevToolkit/DevToolkit.vue

@@ -5,9 +5,7 @@
         <div class="title">
           Tools
         </div>
-        <button type="button" class="close-button" @click="close">
+        <FlatButton icon="xmark" class="close-button" @click="close" />
-          <AppIcon icon="xmark" />
-        </button>
       </div>
       <hr />
       <div class="action-buttons">
@@ -28,12 +26,12 @@
 <script lang="ts">
 import { defineComponent, ref } from 'vue';
 import { injectKey } from '@/presentation/injectionSymbols';
-import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 import { dumpNames } from './DumpNames';
 
 export default defineComponent({
   components: {
-    AppIcon,
+    FlatButton,
   },
   setup() {
     const { log } = injectKey((keys) => keys.useLogger);
@@ -118,19 +116,19 @@ interface DevAction {
     display: flex;
     flex-direction: column;
     gap: 10px;
-  }
 
-  button {
+    button {
-    display: block;
+      display: block;
-    padding: 5px 10px;
+      padding: 5px 10px;
-    background-color: $color-primary;
+      background-color: $color-primary;
-    color: $color-on-primary;
+      color: $color-on-primary;
-    border: none;
+      border: none;
-    cursor: pointer;
+      cursor: pointer;
 
-    @include hover-or-touch {
+      @include hover-or-touch {
-      background-color: $color-secondary;
+        background-color: $color-secondary;
-      color: $color-on-secondary;
+        color: $color-on-secondary;
+      }
     }
   }
 }

src/presentation/components/Scripts/Menu/MenuOptionListItem.vue

@@ -4,23 +4,23 @@
       Parent wrapper allows `MenuOptionList` to safely add content inside
       such as adding content in `::before` block without making it clickable.
     -->
-    <span
+    <FlatButton
-      v-non-collapsing
+      :disabled="!enabled"
-      :class="{
+      :label="label"
-        disabled: !enabled,
+      flat
-        enabled: enabled,
-      }"
       @click="onClicked()"
-    >{{ label }}</span>
+    />
   </span>
 </template>
 
 <script lang="ts">
 import { defineComponent } from 'vue';
 import { NonCollapsing } from '@/presentation/components/Scripts/View/Cards/NonCollapsingDirective';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 
 export default defineComponent({
   directives: { NonCollapsing },
+  components: { FlatButton },
   props: {
     enabled: {
       type: Boolean,
@@ -48,18 +48,3 @@ export default defineComponent({
   },
 });
 </script>
-
-<style scoped lang="scss">
-@use "@/presentation/assets/styles/main" as *;
-
-.enabled {
-  @include clickable;
-  @include hover-or-touch {
-    font-weight:bold;
-    text-decoration:underline;
-  }
-}
-.disabled {
-  color: $color-primary-light;
-}
-</style>

src/presentation/components/Scripts/View/Cards/CardListItem.vue

@@ -31,7 +31,7 @@
     </div>
     <div class="card__expander" @click.stop>
       <div class="card__expander__close-button">
-        <AppIcon
+        <FlatButton
           icon="xmark"
           @click="collapse()"
         />
@@ -51,6 +51,7 @@ import {
   defineComponent, computed, shallowRef,
 } from 'vue';
 import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 import { injectKey } from '@/presentation/injectionSymbols';
 import ScriptsTree from '@/presentation/components/Scripts/View/Tree/ScriptsTree.vue';
 import { sleep } from '@/infrastructure/Threading/AsyncSleep';
@@ -61,6 +62,7 @@ export default defineComponent({
     ScriptsTree,
     AppIcon,
     CardSelectionIndicator,
+    FlatButton,
   },
   props: {
     categoryId: {

src/presentation/components/Scripts/View/TheScriptsView.vue

@@ -17,7 +17,7 @@
             class="search__query__close-button"
             @click="clearSearchQuery()"
           >
-            <AppIcon icon="xmark" />
+            <FlatButton icon="xmark" />
           </div>
         </div>
         <div v-if="!searchHasMatches" class="search-no-matches">
@@ -39,19 +39,19 @@
 import {
   defineComponent, PropType, ref, computed,
 } from 'vue';
-import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
 import { injectKey } from '@/presentation/injectionSymbols';
 import ScriptsTree from '@/presentation/components/Scripts/View/Tree/ScriptsTree.vue';
 import CardList from '@/presentation/components/Scripts/View/Cards/CardList.vue';
 import { ViewType } from '@/presentation/components/Scripts/Menu/View/ViewType';
 import { IReadOnlyUserFilter } from '@/application/Context/State/Filter/IUserFilter';
 import { IFilterResult } from '@/application/Context/State/Filter/IFilterResult';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 
 export default defineComponent({
   components: {
     ScriptsTree,
     CardList,
-    AppIcon,
+    FlatButton,
   },
   props: {
     currentView: {
@@ -149,14 +149,10 @@ $margin-inner: 4px;
     flex-direction: row;
     align-items: center;
     margin-top: 1em;
-    color: $color-primary;
+    color: $color-primary-light;
     .search__query__close-button {
-      @include clickable;
       font-size: 1.25em;
       margin-left: 0.25rem;
-      @include hover-or-touch {
-        color: $color-primary-dark;
-      }
     }
   }
   .search-no-matches {

src/presentation/components/Scripts/View/Tree/NodeContent/Documentation/DocumentationText.vue

@@ -128,7 +128,7 @@ $base-spacing: $text-size;
       */
       @include hover-or-touch {
         &::after{
-          background-color: $globals-color-hover;
+          background-color: $color-highlight;
         }
       }
     }

src/presentation/components/Scripts/View/Tree/NodeContent/Documentation/ToggleDocumentationButton.vue

@@ -1,22 +1,23 @@
 <template>
-  <a
+  <div
-    class="button"
+    class="documentation-button"
-    target="_blank"
+    :class="{ expanded: isOn }"
-    :class="{ 'button-on': isOn }"
     @click.stop
-    @click="toggle()"
   >
-    <AppIcon icon="circle-info" />
+    <FlatButton
-  </a>
+      icon="circle-info"
+      @click="toggle()"
+    />
+  </div>
 </template>
 
 <script lang="ts">
 import { defineComponent, ref } from 'vue';
-import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 
 export default defineComponent({
   components: {
-    AppIcon,
+    FlatButton,
   },
   emits: [
     'show',
@@ -45,14 +46,15 @@ export default defineComponent({
 <style scoped lang="scss">
 @use "@/presentation/assets/styles/main" as *;
 
-.button {
+.documentation-button {
-  @include clickable;
   vertical-align: middle;
   color: $color-primary;
-  @include hover-or-touch {
+  :deep() { // This override leads to inconsistent highlight color, it should be re-styled.
-    color: $color-primary-darker;
+    @include hover-or-touch {
+      color: $color-primary-darker;
+    }
   }
-  &-on {
+  &.expanded {
     color: $color-primary-light;
   }
 }

src/presentation/components/Shared/FlatButton.vue

@@ -0,0 +1,73 @@
+<template>
+  <!-- Use `button` instead of DIV as it is semantically correct and accessibility best-practice -->
+  <button
+    v-non-collapsing
+    type="button"
+    class="flat-button"
+    :class="{
+      disabled: disabled,
+    }"
+    @click="onClicked"
+  >
+    <AppIcon v-if="icon" :icon="icon" />
+    <span v-if="label">{{ label }}</span>
+  </button>
+</template>
+
+<script lang="ts">
+import { defineComponent, PropType } from 'vue';
+import { NonCollapsing } from '@/presentation/components/Scripts/View/Cards/NonCollapsingDirective';
+import { IconName } from '@/presentation/components/Shared/Icon/IconName';
+import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
+
+export default defineComponent({
+  components: { AppIcon },
+  directives: { NonCollapsing },
+  props: {
+    label: {
+      type: String,
+      default: undefined,
+      required: false,
+    },
+    disabled: {
+      type: Boolean,
+      default: false,
+      required: false,
+    },
+    icon: {
+      type: String as PropType<IconName | undefined>,
+      default: undefined,
+      required: false,
+    },
+  },
+  emits: [
+    'click',
+  ],
+  setup(props, { emit }) {
+    function onClicked() {
+      if (props.disabled) {
+        return;
+      }
+      emit('click');
+    }
+    return { onClicked };
+  },
+});
+
+</script>
+
+<style lang="scss" scoped>
+@use "@/presentation/assets/styles/main" as *;
+
+.flat-button {
+  display: inline-flex;
+  gap: 0.5em;
+  font-family: $font-normal;
+  &.disabled {
+    @include flat-button($disabled: true);
+  }
+  &:not(.disabled) {
+    @include flat-button($disabled: false);
+  }
+}
+</style>

src/presentation/components/Shared/Modal/ModalDialog.vue

@@ -6,25 +6,24 @@
       <div class="dialog__content">
         <slot />
       </div>
-      <div
+      <FlatButton
+        icon="xmark"
         class="dialog__close-button"
         @click="hide"
-      >
+      />
-        <AppIcon icon="xmark" />
-      </div>
     </div>
   </ModalContainer>
 </template>
 
 <script lang="ts">
 import { defineComponent, computed } from 'vue';
-import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 import ModalContainer from './ModalContainer.vue';
 
 export default defineComponent({
   components: {
     ModalContainer,
-    AppIcon,
+    FlatButton,
   },
   props: {
     modelValue: {
@@ -72,16 +71,12 @@ export default defineComponent({
     margin: 5%;
   }
 
-  &__close-button {
+  .dialog__close-button {
     color: $color-primary-dark;
     width: auto;
     font-size: 1.5em;
     margin-right: 0.25em;
     align-self: flex-start;
-    @include clickable;
-    @include hover-or-touch {
-      color: $color-primary;
-    }
   }
 }
 </style>

src/presentation/components/TheFooter/DownloadUrlListItem.vue

@@ -64,7 +64,6 @@ function hasDesktopVersion(os: OperatingSystem): boolean {
 <style scoped lang="scss">
 @use "@/presentation/assets/styles/main" as *;
 .url {
-  @include clickable;
   &__active {
     font-size: 1em;
   }

src/presentation/components/TheFooter/TheFooter.vue

@@ -32,8 +32,12 @@
           </a>
         </div>
         <div class="footer__section__item">
-          <AppIcon class="icon" icon="user-secret" />
+          <FlatButton
-          <a @click="showPrivacyDialog()">Privacy</a>
+            label="Privacy"
+            icon="user-secret"
+            flat
+            @click="showPrivacyDialog()"
+          />
         </div>
       </div>
     </div>
@@ -50,6 +54,7 @@ import {
 import ModalDialog from '@/presentation/components/Shared/Modal/ModalDialog.vue';
 import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
 import { injectKey } from '@/presentation/injectionSymbols';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 import DownloadUrlList from './DownloadUrlList.vue';
 import PrivacyPolicy from './PrivacyPolicy.vue';
 
@@ -59,6 +64,7 @@ export default defineComponent({
     PrivacyPolicy,
     DownloadUrlList,
     AppIcon,
+    FlatButton,
   },
   setup() {
     const { info } = injectKey((keys) => keys.useApplication);
@@ -99,7 +105,6 @@ export default defineComponent({
 
 .icon {
   margin-right: 0.5em;
-  text-decoration: none;
 }
 
 .footer {

tests/e2e/modal-layout-shifts.cy.ts

@@ -16,7 +16,7 @@ describe('Modal interaction and layout stability', () => {
       });
 
       cy
-        .contains('a', 'Privacy')
+        .contains('button', 'Privacy')
         .click();
 
       cy

tests/unit/presentation/components/Code/CodeButtons/Save/Instructions/CodeInstruction.spec.ts

@@ -7,9 +7,9 @@ import { Clipboard } from '@/presentation/components/Shared/Hooks/Clipboard/Clip
 import { UseClipboardStub } from '@tests/unit/shared/Stubs/UseClipboardStub';
 import { ClipboardStub } from '@tests/unit/shared/Stubs/ClipboardStub';
 import { expectExists } from '@tests/shared/Assertions/ExpectExists';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
 
 const DOM_SELECTOR_CODE_SLOT = 'code';
-const DOM_SELECTOR_COPY_BUTTON = '.copy-button';
 const COMPONENT_TOOLTIP_WRAPPER_NAME = 'TooltipWrapper';
 
 describe('CodeInstruction.vue', () => {
@@ -35,7 +35,7 @@ describe('CodeInstruction.vue', () => {
       });
       wrapper.vm.codeElement = { textContent: expectedCode } as HTMLElement;
       // act
-      const copyButton = wrapper.find(DOM_SELECTOR_COPY_BUTTON);
+      const copyButton = wrapper.findComponent(FlatButton);
       await copyButton.trigger('click');
       // assert
       const calls = clipboardStub.callHistory;

tests/unit/presentation/components/Shared/FlatButton.spec.ts

@@ -0,0 +1,167 @@
+import {
+  describe, it, expect,
+} from 'vitest';
+import { shallowMount } from '@vue/test-utils';
+import FlatButton from '@/presentation/components/Shared/FlatButton.vue';
+import { IconName } from '@/presentation/components/Shared/Icon/IconName';
+import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
+import { formatAssertionMessage } from '@tests/shared/FormatAssertionMessage';
+import { hasDirective } from '@/presentation/components/Scripts/View/Cards/NonCollapsingDirective';
+
+const DOM_SELECTOR_LABEL = 'span';
+const DOM_SELECTOR_BUTTON = 'button';
+const DOM_CLASS_DISABLED_CLASS = 'disabled';
+
+describe('FlatButton.vue', () => {
+  describe('label', () => {
+    it('renders label when provided', () => {
+      // arrange
+      const expectedLabel = 'expected label';
+
+      // act
+      const wrapper = mountComponent({ labelPropValue: expectedLabel });
+
+      // assert
+      const labelElement = wrapper.find(DOM_SELECTOR_LABEL);
+      expect(labelElement.text()).to.equal(expectedLabel);
+    });
+    it('does not render label when not provided', () => {
+      // arrange
+      const absentLabelValue = undefined;
+
+      // act
+      const wrapper = mountComponent({ labelPropValue: absentLabelValue });
+
+      // assert
+      const labelElement = wrapper.find(DOM_SELECTOR_LABEL);
+      expect(labelElement.exists()).to.equal(false);
+    });
+  });
+  describe('icon', () => {
+    it('renders icon when provided', () => {
+      // arrange
+      const expectedIcon: IconName = 'globe';
+
+      // act
+      const wrapper = mountComponent({ iconPropValue: expectedIcon });
+
+      // assert
+      expect(wrapper.findComponent(AppIcon).exists()).to.equal(true);
+    });
+    it('does not render icon when not provided', () => {
+      // arrange
+      const absentIconValue = undefined;
+
+      // act
+      const wrapper = mountComponent({ iconPropValue: absentIconValue });
+
+      // assert
+      expect(wrapper.findComponent(AppIcon).exists()).to.equal(false);
+    });
+    it('correctly binds given icon', () => {
+      // arrange
+      const expectedIcon: IconName = 'globe';
+
+      // act
+      const wrapper = mountComponent({ iconPropValue: expectedIcon });
+
+      // assert
+      const appIconComponent = wrapper.findComponent(AppIcon);
+      expect(appIconComponent.props('icon')).toEqual(expectedIcon);
+    });
+  });
+  describe('label + icon', () => {
+    it('renders both label and icon when provided', () => {
+      // arrange
+      const expectedLabel = 'Test Label';
+      const expectedIcon: IconName = 'globe';
+
+      // act
+      const wrapper = mountComponent({
+        labelPropValue: expectedLabel,
+        iconPropValue: expectedIcon,
+      });
+
+      // assert
+      const labelElement = wrapper.find(DOM_SELECTOR_LABEL);
+      expect(labelElement.text()).to.equal(expectedLabel);
+      expect(wrapper.findComponent(AppIcon).exists()).to.equal(true);
+    });
+  });
+  describe('disabled', () => {
+    it('emits click event when enabled and clicked', async () => {
+      // arrange
+      const wrapper = mountComponent({ isDisabledPropValue: false });
+
+      // act
+      await wrapper.find(DOM_SELECTOR_BUTTON).trigger('click');
+
+      // assert
+      expect(wrapper.emitted().click).to.have.lengthOf(1, formatAssertionMessage([
+        `Disabled prop value: ${wrapper.props('disabled')}`,
+        `Emitted events: ${JSON.stringify(wrapper.emitted())}`,
+        'Inner HTML:', wrapper.html(),
+      ]));
+    });
+    it('does not emit click event when disabled and clicked', async () => {
+      // arrange
+      const wrapper = mountComponent({ isDisabledPropValue: true });
+
+      // act
+      await wrapper.find(DOM_SELECTOR_BUTTON).trigger('click');
+
+      // assert
+      expect(wrapper.emitted().click ?? []).to.have.lengthOf(0, formatAssertionMessage([
+        `Disabled prop value: ${wrapper.props('disabled')}`,
+        'Inner HTML:', wrapper.html(),
+      ]));
+    });
+    it('applies disabled class when disabled', () => {
+      // arrange & act
+      const wrapper = mountComponent({ isDisabledPropValue: true });
+      // assert
+      const classes = wrapper.find(DOM_SELECTOR_BUTTON).classes();
+      expect(classes).to.contain(DOM_CLASS_DISABLED_CLASS, formatAssertionMessage([
+        `Disabled prop value: ${wrapper.props('disabled')}`,
+        'Inner HTML:', wrapper.html(),
+      ]));
+    });
+    it('does not apply disabled class when enabled', () => {
+      // arrange & act
+      const wrapper = mountComponent({ isDisabledPropValue: false });
+      // assert
+      const classes = wrapper.find(DOM_SELECTOR_BUTTON).classes();
+      expect(classes).not.contain(DOM_CLASS_DISABLED_CLASS, formatAssertionMessage([
+        `Disabled prop value: ${wrapper.props('disabled')}`,
+        'Inner HTML:', wrapper.html(),
+      ]));
+    });
+  });
+  it('applies non-collapsing directive correctly', () => {
+    // act & arrange
+    const wrapper = mountComponent();
+
+    // assert
+    const button = wrapper.find(DOM_SELECTOR_BUTTON);
+    const isDirectiveApplied = hasDirective(button.element);
+    expect(isDirectiveApplied).to.equal(true, formatAssertionMessage([
+      `Attributes: ${JSON.stringify(button.attributes())}`,
+      'Button HTML:', button.html(),
+    ]));
+  });
+});
+
+function mountComponent(options?: {
+  readonly iconPropValue?: IconName,
+  readonly labelPropValue?: string,
+  readonly isDisabledPropValue?: boolean,
+  readonly nonCollapsingDirective?: () => void,
+}) {
+  return shallowMount(FlatButton, {
+    props: {
+      icon: options === undefined ? 'globe' : options?.iconPropValue,
+      label: options === undefined ? 'stub-label' : options?.labelPropValue,
+      disabled: options?.isDisabledPropValue,
+    },
+  });
+}