coreui
diff --git a/‎projects/coreui-angular/src/lib/form/form-select/form-select.directive.spec.ts
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+5-2Lines changed: 5 additions & 2 deletions b/‎projects/coreui-angular/src/lib/form/form-select/form-select.directive.spec.ts
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+5-2Lines changed: 5 additions & 2 deletions
diff --git a/‎projects/coreui-angular/src/lib/form/form-select/form-select.directive.ts
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+13-11Lines changed: 13 additions & 11 deletions b/‎projects/coreui-angular/src/lib/form/form-select/form-select.directive.ts
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+13-11Lines changed: 13 additions & 11 deletions
@@ -1,8 +1,11 @@
 import { FormSelectDirective } from './form-select.directive';
+import { TestBed } from '@angular/core/testing';
 
 describe('FormSelectDirective', () => {
   it('should create an instance', () => {
-    const directive = new FormSelectDirective();
-    expect(directive).toBeTruthy();
+    TestBed.runInInjectionContext(() => {
+      const directive = new FormSelectDirective();
+      expect(directive).toBeTruthy();
+    });
   });
 });
@@ -1,28 +1,30 @@
-import { Directive, HostBinding, Input } from '@angular/core';
+import { computed, Directive, input } from '@angular/core';
 
 @Directive({
   selector: 'select[cSelect]',
-  host: { class: 'form-select' }
+  host: { class: 'form-select', '[class]': 'hostClasses()' }
 })
 export class FormSelectDirective {
   /**
    * Size the component small or large.
+   * @default undefined
    */
-  @Input() sizing?: '' | 'sm' | 'lg' | string = '';
+  readonly sizing = input<'' | 'sm' | 'lg' | string>();
 
   /**
    * Set component validation state to valid.
-   * @type {boolean | undefined}
+   * @default undefined
    */
-  @Input() valid?: boolean;
+  readonly valid = input<boolean>();
 
-  @HostBinding('class')
-  get hostClasses(): any {
+  readonly hostClasses = computed(() => {
+    const sizing = this.sizing();
+    const valid = this.valid();
     return {
       'form-select': true,
-      [`form-select-${this.sizing}`]: !!this.sizing,
-      'is-valid': this.valid === true,
-      'is-invalid': this.valid === false
+      [`form-select-${sizing}`]: !!sizing,
+      'is-valid': valid === true,
+      'is-invalid': valid === false
     };
-  }
+  });
 }