feat(shared): para, miktar ve İstanbul günü yardımcıları

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/shared/money.test.ts

@@ -0,0 +1,87 @@
+import { describe, expect, it } from "vitest";
+import { allocate, formatMoneyInput, parseMoney, splitEvenly, sumMoney } from "./money";
+
+describe("parseMoney", () => {
+  it.each([
+    ["1.250,50", 125050],
+    ["1250,50", 125050],
+    ["1250,5", 125050],
+    ["1250", 125000],
+    ["0,01", 1],
+    [",5", 50],
+    ["1.250", 125000],
+    ["12.345.678,90", 1234567890],
+    ["12.5", 1250],
+    ["12.50", 1250],
+    ["₺1.250,50", 125050],
+    ["1.250,50 TL", 125050],
+    ["  1 250,50 ", 125050],
+    ["-12,30", -1230],
+    ["−12,30", -1230],
+    ["+7", 700],
+    ["0", 0],
+    ["-0", 0],
+  ])("%s → %i", (input, expected) => {
+    expect(parseMoney(input)).toBe(expected);
+  });
+
+  it.each([
+    "",
+    "abc",
+    "1,2,3",
+    "12,345",
+    "1.25,00",
+    "1.2345",
+    "12.345.6",
+    "1,5e3",
+    "--5",
+    "100000000000,01",
+  ])("geçersiz: %s", (input) => {
+    expect(parseMoney(input)).toBeNull();
+  });
+});
+
+describe("formatMoneyInput", () => {
+  it("Türkçe biçimde simgesiz yazar ve parseMoney ile geri döner", () => {
+    for (const v of [0, 1, 99, 100, 125050, 1234567890, -1230]) {
+      expect(parseMoney(formatMoneyInput(v))).toBe(v);
+    }
+    expect(formatMoneyInput(125050)).toBe("1.250,50");
+    expect(formatMoneyInput(-5)).toBe("-0,05");
+  });
+});
+
+describe("allocate", () => {
+  it("toplam her zaman korunur (kuruş kaybı yok)", () => {
+    for (const total of [1, 100, 10000, 99999, 120000, -10001]) {
+      for (const weights of [[1], [1, 1, 1], [800, 250, 150], [1, 2, 3, 4, 5, 6, 7], [0, 1]]) {
+        const parts = allocate(total, weights);
+        expect(parts.reduce((a, b) => a + b, 0)).toBe(total);
+        expect(parts).toHaveLength(weights.length);
+      }
+    }
+  });
+
+  it("ağırlıklara orantılıdır ve deterministiktir", () => {
+    expect(allocate(120000, [800, 250, 150])).toEqual([80000, 25000, 15000]);
+    expect(allocate(100, [1, 1, 1])).toEqual([34, 33, 33]);
+    expect(allocate(-100, [1, 1, 1])).toEqual([-34, -33, -33]);
+    expect(allocate(5, [0, 1])).toEqual([0, 5]);
+  });
+
+  it("geçersiz girdiyi reddeder", () => {
+    expect(() => allocate(100, [])).toThrow(RangeError);
+    expect(() => allocate(100, [0, 0])).toThrow(RangeError);
+    expect(() => allocate(100, [-1, 2])).toThrow(RangeError);
+    expect(() => allocate(1.5, [1])).toThrow(TypeError);
+  });
+});
+
+describe("splitEvenly", () => {
+  it("9 taksit: 1.000,00 TL", () => {
+    const parts = splitEvenly(100000, 9);
+    expect(sumMoney(parts)).toBe(100000);
+    expect(parts[0]).toBe(11112);
+    expect(parts.slice(1).every((p) => p === 11111)).toBe(true);
+  });
+});