First row of tests and fixes

module/applications/sheets/field-sheet.mjs

@@ -5,7 +5,11 @@ export default class AwEFieldSheet extends AwEItemSheet {
   static DEFAULT_OPTIONS = {
     classes: ["field"],
     position: { width: 620 },
-    window: { contentClasses: ["field-content"] }
+    window: { contentClasses: ["field-content"] },
+    actions: {
+      addSpecialization: AwEFieldSheet.#onAddSpecialization,
+      removeSpecialization: AwEFieldSheet.#onRemoveSpecialization
+    }
   }
 
   /** @override */
@@ -14,4 +18,29 @@ export default class AwEFieldSheet extends AwEItemSheet {
       template: "systems/fvtt-adventures-with-emmy/templates/field.hbs"
     }
   }
+
+  /**
+   * Handle adding a specialization.
+   * @param {PointerEvent} event - The initiating event.
+   * @param {HTMLElement} target - The input element.
+   */
+  static async #onAddSpecialization(event, target) {
+    const value = target.value.trim()
+    if (!value) return
+    const current = this.document.system.specializations ?? []
+    await this.document.update({ "system.specializations": [...current, value] })
+    target.value = ""
+  }
+
+  /**
+   * Handle removing a specialization.
+   * @param {PointerEvent} event - The initiating click event.
+   * @param {HTMLElement} target - The remove button.
+   */
+  static async #onRemoveSpecialization(event, target) {
+    const index = Number(target.dataset.index)
+    const current = [...(this.document.system.specializations ?? [])]
+    current.splice(index, 1)
+    await this.document.update({ "system.specializations": current })
+  }
 }