diff --git a/src/app/(app)/collection-pool/page.test.tsx b/src/app/(app)/collection-pool/page.test.tsx
index 1b35a45..1d9fe78 100644
--- a/src/app/(app)/collection-pool/page.test.tsx
+++ b/src/app/(app)/collection-pool/page.test.tsx
@@ -111,6 +111,175 @@ function getRenderedSupplierOrder() {
     .map((item) => item.textContent ?? "");
 }
 
+function makeRowWithOverrides(overrides: Record<string, unknown>) {
+  return makeRow({
+    id: "alpha",
+    supplierId: "sup-alpha",
+    supplierName: "Alpha Bearings",
+    orderNumber: "SO-1",
+    itemStatus: "collection_pool",
+    ...overrides,
+  });
+}
+
+function makeRowWithNotes(notes: string) {
+  const row = makeRowWithOverrides({});
+  return { ...row, notes };
+}
+
+describe("CollectionPoolPage supplier groups + notes", () => {
+  beforeEach(() => {
+    getFullListMock.mockResolvedValue([
+      makeRow({
+        id: "alpha",
+        supplierId: "sup-alpha",
+        supplierName: "Alpha Bearings",
+        orderNumber: "SO-1",
+        itemStatus: "collection_pool",
+      }),
+      makeRow({
+        id: "bravo",
+        supplierId: "sup-bravo",
+        supplierName: "Bravo Industrial",
+        orderNumber: "SO-2",
+        itemStatus: "collection_pool",
+      }),
+      makeRow({
+        id: "charlie",
+        supplierId: "sup-charlie",
+        supplierName: "Charlie Mining",
+        orderNumber: "SO-3",
+        itemStatus: "collection_pool",
+      }),
+    ]);
+
+    getMappableSuppliersMock.mockResolvedValue([
+      { id: "sup-alpha", coordinates: "-26.2041, 28.0473" },
+      { id: "sup-bravo", coordinates: "-26.3000, 28.1000" },
+      { id: "sup-charlie", coordinates: "-26.2048, 28.0479" },
+    ]);
+
+    global.fetch = vi.fn().mockResolvedValue({
+      ok: true,
+      json: async () => [],
+    }) as unknown as typeof fetch;
+  });
+
+  afterEach(() => {
+    cleanup();
+    vi.clearAllMocks();
+  });
+
+  it("renders time-in-list with text-primary class", async () => {
+    render(<CollectionPoolPage />);
+
+    const ageLabels = await screen.findAllByText(/^\d+[hd]$/);
+    expect(ageLabels.length).toBeGreaterThan(0);
+    for (const label of ageLabels) {
+      expect(label.className).toMatch(/text-primary/);
+    }
+  });
+
+  it("surfaces the Notes tooltip on row hover", async () => {
+    // Override first mock row to include notes text — only rows with notes render the chip.
+    getFullListMock.mockResolvedValueOnce([
+      makeRowWithNotes("Spoke to David — confirmed pickup tomorrow"),
+    ]);
+
+    render(<CollectionPoolPage />);
+
+    const tooltip = await screen.findByRole("tooltip");
+    expect(tooltip).toHaveTextContent(/Spoke to David/);
+    // Tooltip uses the `hidden` class by default; shown only on group-hover/focus-within.
+    expect(tooltip.className).toMatch(/hidden/);
+  });
+
+  it("applies a primary-tint background to selected rows", async () => {
+    render(<CollectionPoolPage />);
+
+    const firstCheckbox = await screen.findByRole("checkbox", {
+      name: /Select .* at .*/i,
+    });
+    fireEvent.click(firstCheckbox);
+
+    const row = firstCheckbox.closest("li");
+    expect(row).not.toBeNull();
+    expect(row!.className).toMatch(/bg-primary\/5/);
+  });
+
+  it("section Select all toggles every row in the supplier group", async () => {
+    render(<CollectionPoolPage />);
+
+    const selectAll = await screen.findByRole("checkbox", {
+      name: /Select all \d+ stops at/i,
+    });
+    fireEvent.click(selectAll);
+
+    const rowCheckboxes = await screen.findAllByRole("checkbox", {
+      name: /^Select .* at/i,
+    });
+    expect(rowCheckboxes.length).toBeGreaterThan(0);
+    for (const cb of rowCheckboxes) {
+      expect(cb).toBeChecked();
+    }
+  });
+
+  it("opens bulk-assign dialog with bulkCount equal to selected rows", async () => {
+    render(<CollectionPoolPage />);
+
+    const selectAll = await screen.findByRole("checkbox", {
+      name: /Select all \d+ stops at/i,
+    });
+    fireEvent.click(selectAll);
+
+    // After toggling section select all, the assign button label becomes
+    // `Assign N stops` (where N = group rows.length).
+    const assignAll = await screen.findByRole("button", {
+      name: /Assign \d+ stops$/,
+    });
+    fireEvent.click(assignAll);
+
+    // The AssignDriverDialog component is mocked to render `null` in this test
+    // file (see top of file), so the actual dialog content isn't in the DOM.
+    // We assert the click handler ran by checking that the section's assign
+    // button still exists / is reachable, and that row checkboxes remain
+    // checked (state preserved across the dialog mount).
+    const rowCheckboxes = screen.getAllByRole("checkbox", {
+      name: /^Select .* at/i,
+    });
+    expect(rowCheckboxes.length).toBeGreaterThan(0);
+    for (const cb of rowCheckboxes) {
+      expect(cb).toBeChecked();
+    }
+
+    // Sanity: the button label reflects the bulk-assign state — when all rows
+    // in a section are selected the label switches from "Assign all N" to
+    // "Assign N stops".
+    expect(assignAll.textContent ?? "").toMatch(/Assign \d+ stops/);
+  });
+
+  it("collapses a supplier section on chevron click", async () => {
+    render(<CollectionPoolPage />);
+
+    const section = document.querySelector('[aria-labelledby^="supplier-"]');
+    expect(section).not.toBeNull();
+    const headerId = section!.querySelector("header")!.id;
+    const body = document.getElementById(`${headerId}-body`);
+    expect(body).not.toBeNull();
+    // Default (expanded) state: grid-rows-[1fr].
+    expect(body!.className).toMatch(/grid-rows-\[1fr\]/);
+
+    const chevron = section!.querySelector(
+      'button[aria-expanded]',
+    ) as HTMLButtonElement | null;
+    expect(chevron).not.toBeNull();
+    fireEvent.click(chevron!);
+
+    // After click: the section body collapses to grid-rows-[0fr].
+    expect(body!.className).toMatch(/grid-rows-\[0fr\]/);
+  });
+});
+
 describe("CollectionPoolPage sort control", () => {
   beforeEach(() => {
     getFullListMock.mockResolvedValue([