src/components/adjustments/AdjustmentForm.render.test.tsx

@@ -0,0 +1,87 @@
+// AdjustmentForm — each adjustment line picks its category in a combobox
+// (#429). No jsdom: react-dom/server renders the initial markup in vitest's
+// node environment, the combobox closed, so without its list in a portal.
+import { describe, it, expect, vi } from "vitest";
+import { renderToStaticMarkup } from "react-dom/server";
+
+vi.mock("react-i18next", async () => (await import("../../test/i18nMock")).i18nMock());
+
+import AdjustmentForm from "./AdjustmentForm";
+import type { Category } from "../../shared/types";
+import type { EntryFormData } from "../../hooks/useAdjustments";
+
+const category = (id: number, name: string, extra: Partial<Category> = {}): Category => ({
+  id,
+  name,
+  type: "expense",
+  is_active: true,
+  is_inputable: true,
+  sort_order: id,
+  created_at: "",
+  ...extra,
+});
+
+/** A seed category, translated through its key, and one the user created. */
+const GROCERIES = category(10, "Épicerie régulière", {
+  i18n_key: "categoriesSeed.alimentation.epicerie.reguliere",
+});
+const CABIN = category(20, "Chalet");
+
+const line = (categoryId: number): EntryFormData => ({
+  category_id: categoryId,
+  amount: 12.5,
+  description: "",
+});
+
+const markup = (entries: EntryFormData[]) =>
+  renderToStaticMarkup(
+    <AdjustmentForm
+      initialData={{ name: "Chalet", description: "", date: "2026-10-01", is_recurring: false }}
+      initialEntries={entries}
+      categories={[GROCERIES, CABIN]}
+      isCreating={false}
+      isSaving={false}
+      onSave={vi.fn()}
+      onCancel={vi.fn()}
+    />,
+  );
+
+/** The comboboxes' inputs, in the order of the lines. */
+const comboboxes = (html: string) => html.match(/<input [^>]*role="combobox"[^>]*>/g) ?? [];
+
+describe("AdjustmentForm — category of a line (#429)", () => {
+  it("gives every line a combobox, and no select", () => {
+    const html = markup([line(10), line(20)]);
+    expect(comboboxes(html)).toHaveLength(2);
+    expect(html).not.toContain("<select");
+  });
+
+  it("shows each line's category, a seed one through its key, a user one by its name", () => {
+    const [seed, user] = comboboxes(markup([line(10), line(20)]));
+    expect(seed).toContain(
+      'value="t(categoriesSeed.alimentation.epicerie.reguliere[defaultValue=Épicerie régulière])"',
+    );
+    expect(user).toContain('value="Chalet"');
+  });
+
+  it("names every combobox and renders it compact, as in the split window", () => {
+    const inputs = comboboxes(markup([line(10), line(20)]));
+    expect(inputs).toHaveLength(2);
+    for (const input of inputs) {
+      expect(input).toContain('aria-label="t(adjustments.category)"');
+      expect(input).toMatch(/class="w-full px-2 py-1 /);
+    }
+  });
+
+  it("leaves the field empty for a line on a category the list does not offer (D2)", () => {
+    // A category hidden from input is not in the list: nothing to show.
+    const [input] = comboboxes(markup([line(99)]));
+    expect(input).toContain('value=""');
+  });
+
+  it("keeps the empty state of an adjustment without a line", () => {
+    const html = markup([]);
+    expect(comboboxes(html)).toHaveLength(0);
+    expect(html).toContain(">t(adjustments.noEntries)<");
+  });
+});

src/components/adjustments/AdjustmentForm.tsx

@@ -3,6 +3,7 @@ import { useTranslation } from "react-i18next";
 import { Plus, Trash2 } from "lucide-react";
 import type { Category } from "../../shared/types";
 import type { AdjustmentFormData, EntryFormData } from "../../hooks/useAdjustments";
+import CategoryCombobox from "../shared/CategoryCombobox";
 
 interface Props {
   initialData: AdjustmentFormData;
@@ -120,17 +121,15 @@ export default function AdjustmentForm({
           <div className="flex flex-col gap-2">
             {entries.map((entry, index) => (
               <div key={index} className="flex items-center gap-2">
-                <select
-                  value={entry.category_id}
-                  onChange={(e) => updateEntryField(index, "category_id", Number(e.target.value))}
-                  className="flex-1 px-2 py-1.5 rounded-lg border border-[var(--border)] bg-[var(--card)] text-sm focus:outline-none focus:ring-1 focus:ring-[var(--primary)]"
-                >
-                  {categories.map((c) => (
-                    <option key={c.id} value={c.id}>
-                      {c.name}
-                    </option>
-                  ))}
-                </select>
+                <div className="flex-1 min-w-0">
+                  <CategoryCombobox
+                    categories={categories}
+                    value={entry.category_id}
+                    onChange={(id) => updateEntryField(index, "category_id", id)}
+                    compact
+                    ariaLabel={t("adjustments.category")}
+                  />
+                </div>
                 <input
                   type="number"
                   step="0.01"

src/components/adjustments/AdjustmentForm.wiring.test.ts

@@ -0,0 +1,116 @@
+// AdjustmentForm — what a line's combobox changes (#429).
+//
+// A static render clicks nothing. React's hooks come from the shared harness
+// (src/test/hookHarness.ts, #409): the form runs as a plain function, its
+// state survives from one call to the next as between two renders of a
+// mounted form, and the test calls the props the form hands to each
+// CategoryCombobox and to its buttons, then renders again to read the lines.
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { isValidElement, type ReactElement, type ReactNode } from "react";
+
+vi.mock("react", async (orig) => (await import("../../test/hookHarness")).fakeReact(await orig()));
+vi.mock("react-i18next", async () => (await import("../../test/i18nMock")).i18nMock());
+
+import { hookHarness } from "../../test/hookHarness";
+import AdjustmentForm from "./AdjustmentForm";
+import CategoryCombobox from "../shared/CategoryCombobox";
+import type { Category } from "../../shared/types";
+import type { AdjustmentFormData, EntryFormData } from "../../hooks/useAdjustments";
+
+const harness = hookHarness();
+
+type Props = Record<string, unknown> & { children?: ReactNode };
+
+function find(node: ReactNode, match: (el: ReactElement<Props>) => boolean): ReactElement<Props>[] {
+  if (Array.isArray(node)) return node.flatMap((n) => find(n, match));
+  if (!isValidElement(node)) return [];
+  const el = node as ReactElement<Props>;
+  return [...(match(el) ? [el] : []), ...find(el.props.children, match)];
+}
+
+/** Text of an element's children, elements left out. */
+const text = (node: ReactNode): string =>
+  Array.isArray(node) ? node.map(text).join("") : typeof node === "string" ? node : "";
+
+const category = (id: number, name: string): Category => ({
+  id,
+  name,
+  type: "expense",
+  is_active: true,
+  is_inputable: true,
+  sort_order: id,
+  created_at: "",
+});
+
+const RENT = category(30, "Loyer");
+const CABIN = category(20, "Chalet");
+/** In the list's order: a new line takes the first one. */
+const CATEGORIES = [RENT, CABIN];
+
+const DATA: AdjustmentFormData = { name: "Chalet", description: "", date: "2026-10-01", is_recurring: false };
+
+let onSave = vi.fn();
+
+/** One render of the mounted form; the props keep their identity from one render to the next. */
+const mount = (entries: EntryFormData[]) => {
+  const props = {
+    initialData: DATA,
+    initialEntries: entries,
+    categories: CATEGORIES,
+    isCreating: false,
+    isSaving: false,
+    onSave,
+    onCancel: vi.fn(),
+  };
+  return () => harness.render(() => AdjustmentForm(props));
+};
+
+const comboboxes = (tree: ReactNode) => find(tree, (el) => el.type === CategoryCombobox);
+const addButton = (tree: ReactNode) =>
+  find(tree, (el) => el.type === "button" && text(el.props.children) === "t(adjustments.addEntry)")[0];
+const form = (tree: ReactNode) => find(tree, (el) => el.type === "form")[0];
+
+beforeEach(() => {
+  harness.clear();
+  onSave = vi.fn();
+});
+
+describe("AdjustmentForm — a line's category (#429)", () => {
+  it("gives a new line the first category of the list", () => {
+    const render = mount([]);
+    let tree = render();
+    expect(comboboxes(tree)).toHaveLength(0);
+    (addButton(tree).props.onClick as () => void)();
+    tree = render();
+    const [combobox] = comboboxes(tree);
+    expect(combobox.props.value).toBe(RENT.id);
+    expect(combobox.props.categories).toBe(CATEGORIES);
+    expect(combobox.props.compact).toBe(true);
+    expect(combobox.props.ariaLabel).toBe("t(adjustments.category)");
+  });
+
+  it("changes the category of the line picked, and of that line only", () => {
+    const render = mount([
+      { id: 1, category_id: RENT.id, amount: 1200, description: "" },
+      { id: 2, category_id: RENT.id, amount: 80, description: "Électricité" },
+    ]);
+    let tree = render();
+    (comboboxes(tree)[1].props.onChange as (id: number) => void)(CABIN.id);
+    tree = render();
+    expect(comboboxes(tree).map((c) => c.props.value)).toEqual([RENT.id, CABIN.id]);
+  });
+
+  it("saves every line with its category, its amount and its description, as before", () => {
+    const render = mount([{ id: 1, category_id: RENT.id, amount: 1200, description: "" }]);
+    let tree = render();
+    (addButton(tree).props.onClick as () => void)();
+    tree = render();
+    (comboboxes(tree)[1].props.onChange as (id: number) => void)(CABIN.id);
+    tree = render();
+    (form(tree).props.onSubmit as (e: { preventDefault: () => void }) => void)({ preventDefault: vi.fn() });
+    expect(onSave).toHaveBeenCalledWith(DATA, [
+      { id: 1, category_id: RENT.id, amount: 1200, description: "" },
+      { category_id: CABIN.id, amount: 0, description: "" },
+    ]);
+  });
+});

src/hooks/useAdjustments.test.ts

@@ -0,0 +1,85 @@
+// useAdjustments — the categories an adjustment line can pick (#429, D2).
+//
+// React's hooks come from the shared harness (src/test/hookHarness.ts, #409):
+// the hook runs as a plain function, its reducer is applied, and `commit()`
+// runs its mount effect. The services are mocked; the base answers a raw
+// query with every active category, so a hook that read the base itself,
+// instead of the Transactions list, would show it.
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+vi.mock("react", async (orig) => (await import("../test/hookHarness")).fakeReact(await orig()));
+const { getAllCategories, getAllAdjustments, select } = vi.hoisted(() => ({
+  getAllCategories: vi.fn(),
+  getAllAdjustments: vi.fn(),
+  select: vi.fn(),
+}));
+vi.mock("../services/transactionService", () => ({ getAllCategories }));
+vi.mock("../services/adjustmentService", () => ({
+  getAllAdjustments,
+  getEntriesByAdjustmentId: vi.fn(),
+  createAdjustment: vi.fn(),
+  updateAdjustment: vi.fn(),
+  deleteAdjustment: vi.fn(),
+  createEntry: vi.fn(),
+  updateEntry: vi.fn(),
+  deleteEntry: vi.fn(),
+}));
+vi.mock("../services/db", () => ({ getDb: vi.fn(async () => ({ select })) }));
+
+import { hookHarness } from "../test/hookHarness";
+import { useAdjustments } from "./useAdjustments";
+import type { Category } from "../shared/types";
+
+const harness = hookHarness();
+
+const category = (id: number, name: string, isInputable: boolean): Category => ({
+  id,
+  name,
+  type: "expense",
+  is_active: true,
+  is_inputable: isInputable,
+  sort_order: id,
+  created_at: "",
+});
+
+/** The Transactions list: active and open to input. */
+const INPUTABLE = [category(1, "Épicerie", true), category(2, "Loyer", true)];
+/** Every active category, a parent hidden from input included. */
+const ACTIVE = [category(3, "Alimentation", false), ...INPUTABLE];
+
+/** Lets the loaders' promises settle. */
+const flush = async () => {
+  for (let i = 0; i < 10; i++) await Promise.resolve();
+};
+
+beforeEach(() => {
+  harness.clear();
+  getAllCategories.mockReset();
+  getAllCategories.mockResolvedValue(INPUTABLE);
+  getAllAdjustments.mockReset();
+  getAllAdjustments.mockResolvedValue([]);
+  select.mockReset();
+  select.mockResolvedValue(ACTIVE);
+});
+
+describe("useAdjustments — categories of a line (#429, D2)", () => {
+  it("offers the Transactions list, active and open to input, not every active category", async () => {
+    harness.render(useAdjustments);
+    harness.commit();
+    await flush();
+    const { state } = harness.render(useAdjustments);
+    expect(state.categories).toBe(INPUTABLE);
+    expect(getAllCategories).toHaveBeenCalledTimes(1);
+    expect(select).not.toHaveBeenCalled();
+  });
+
+  it("reports a failed read as the page's error, with no category", async () => {
+    getAllCategories.mockRejectedValue(new Error("database is locked"));
+    harness.render(useAdjustments);
+    harness.commit();
+    await flush();
+    const { state } = harness.render(useAdjustments);
+    expect(state.categories).toEqual([]);
+    expect(state.error).toBe("database is locked");
+  });
+});

src/hooks/useAdjustments.ts

@@ -11,7 +11,7 @@ import {
   updateEntry,
   deleteEntry,
 } from "../services/adjustmentService";
-import { getDb } from "../services/db";
+import { getAllCategories } from "../services/transactionService";
 
 export interface AdjustmentFormData {
   name: string;
@@ -123,12 +123,14 @@ export function useAdjustments() {
   const [state, dispatch] = useReducer(reducer, initialState);
   const fetchIdRef = useRef(0);
 
+  // The categories a line can pick, the list of the Transactions page: active
+  // and open to input (#429, D2). The page passes it to the adjustment form and
+  // to the split window, both pickers; the detail view names a line's
+  // category from the entries' own join, so a line saved on a category hidden
+  // from input keeps its name there, and its value until changed by hand.
   const loadCategories = useCallback(async () => {
     try {
-      const db = await getDb();
-      const rows = await db.select<Category[]>(
-        "SELECT * FROM categories WHERE is_active = 1 ORDER BY sort_order, name"
-      );
+      const rows = await getAllCategories();
       dispatch({ type: "SET_CATEGORIES", payload: rows });
     } catch (e) {
       dispatch({ type: "SET_ERROR", payload: e instanceof Error ? e.message : String(e) });