Reputation economy: rep-scaled buy/refuel discounts + job reward quality (ISS-072, v0.38.0)

lib/game/catalog.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect, it } from 'vitest';
-import { PLANE_TYPES, STARTER_MODEL } from './catalog';
+import { FUEL_DISCOUNT_PER_REP, MAX_FUEL_DISCOUNT, MAX_PLANE_DISCOUNT, PLANE_DISCOUNT_PER_REP, PLANE_TYPES, repRate, STARTER_MODEL } from './catalog';
+import { STARTING_REPUTATION } from './seed';
 
 // v0.28.0 (ISS-047) — catalog sanity: the progression ladder must stay well-formed as types are added.
 describe('PLANE_TYPES', () => {
@@ -22,3 +23,23 @@ describe('PLANE_TYPES', () => {
     expect(PLANE_TYPES[STARTER_MODEL]).toBeDefined();
   });
 });
+
+// v0.38.0 (ISS-072) — the shared rep-discount shape: linear above the starting value, capped.
+describe('repRate', () => {
+  it('is exactly 0 at and below the starting reputation', () => {
+    expect(repRate(STARTING_REPUTATION, PLANE_DISCOUNT_PER_REP, MAX_PLANE_DISCOUNT)).toBe(0);
+    expect(repRate(0, PLANE_DISCOUNT_PER_REP, MAX_PLANE_DISCOUNT)).toBe(0);
+    expect(repRate(-5, FUEL_DISCOUNT_PER_REP, MAX_FUEL_DISCOUNT)).toBe(0); // below-start clamps too
+  });
+
+  it('is linear in reputation above the starting value (exact mid-range values)', () => {
+    expect(repRate(STARTING_REPUTATION + 10, PLANE_DISCOUNT_PER_REP, MAX_PLANE_DISCOUNT)).toBeCloseTo(0.1, 12); // 0.01 × 10
+    expect(repRate(STARTING_REPUTATION + 30, PLANE_DISCOUNT_PER_REP, MAX_PLANE_DISCOUNT)).toBeCloseTo(0.3, 12); // 0.01 × 30
+    expect(repRate(STARTING_REPUTATION + 40, FUEL_DISCOUNT_PER_REP, MAX_FUEL_DISCOUNT)).toBeCloseTo(0.2, 12); // 0.005 × 40 = cap
+  });
+
+  it('clamps at the cap', () => {
+    expect(repRate(STARTING_REPUTATION + 50, PLANE_DISCOUNT_PER_REP, MAX_PLANE_DISCOUNT)).toBe(MAX_PLANE_DISCOUNT); // 0.5 → capped to 0.4
+    expect(repRate(1_000_000, FUEL_DISCOUNT_PER_REP, MAX_FUEL_DISCOUNT)).toBe(MAX_FUEL_DISCOUNT);
+  });
+});