feat: Use a scaling review factor.

app/revenue/calculate-revenue.spec.ts

@@ -4,10 +4,11 @@ describe('Calculate Revenue', () => {
   describe('calculateRevenue', () => {
 
     it('calculates the gross revenue.', () => {
-      expect(calculateRevenue(100, 10)).toEqual(45000)
-      expect(calculateRevenue(1000, 15)).toEqual(675000)
-      expect(calculateRevenue(10000, 4.99)).toEqual(2245500)
-      expect(calculateRevenue(50030, 59.99)).toEqual(135058486.5)
+      expect(calculateRevenue(100, 10)).toEqual(20_000)
+      expect(calculateRevenue(1_000, 10)).toEqual(360_000)
+      expect(calculateRevenue(25_000, 10)).toEqual(12_250_000)
+      expect(calculateRevenue(50_000, 10)).toEqual(29_500_000)
+      expect(calculateRevenue(500_000, 10)).toEqual(240_000_000)
     })
 
   })

app/revenue/calculate-revenue.ts

@@ -9,7 +9,28 @@ export interface RevenueBreakdown {
 }
 
 export function calculateRevenue(numberOfReviews: number, price: number): number {
-  const numberOfCopiesSold = numberOfReviews * 45.0
+  // Source: https://newsletter.gamediscover.co/p/steam-sales-estimates-why-game-popularity
+  const K = () => {
+    if (numberOfReviews < 999) {
+      return 20
+    }
+
+    if (numberOfReviews < 9999) {
+      return 36
+    }
+
+    if (numberOfReviews < 49999) {
+      return 49
+    }
+
+    if (numberOfReviews < 99999) {
+      return 59
+    }
+
+    return 48
+  }
+
+  const numberOfCopiesSold = numberOfReviews * K()
   const grossRevenue = numberOfCopiesSold * price
 
   return grossRevenue

app/routes/_index.tsx

@@ -1,4 +1,5 @@
 import { useState } from 'react'
+
 import { Page } from '~/components/page'
 import { calculateRevenue, revenueBreakdown } from '~/revenue'
 import { RevenueBreakdownTable } from '~/revenue/revenue-breakdown-table'

app/tests/routes/game-page.spec.tsx

@@ -4,6 +4,7 @@
 
 import '@testing-library/jest-dom'
 import { render, screen } from '@testing-library/react'
+import { MemoryRouter } from 'react-router-dom'
 
 import GameRoute from '~/routes/app.$id.$slug'
 
@@ -33,7 +34,11 @@ describe('GameRoute', () => {
       }
     }))
 
-    render(<GameRoute />)
+    render(
+      <MemoryRouter>
+        <GameRoute />
+      </MemoryRouter>
+    )
 
     expect(screen.getByTestId('title')).toHaveTextContent('Rust')
     expect(screen.getByTestId('description')).toHaveTextContent(

app/tests/routes/home-page.spec.tsx

@@ -5,23 +5,28 @@
 import '@testing-library/jest-dom'
 import { render, screen } from '@testing-library/react'
 import userEvent from '@testing-library/user-event'
+import { MemoryRouter } from 'react-router-dom'
 
 import HomePageRoute from '~/routes/_index'
 
 describe('HomePageRoute', () => {
   it('uses the price and number of reviews to calculate the gross & net revenue.', async () => {
-    render(<HomePageRoute />)
+    render(
+      <MemoryRouter>
+        <HomePageRoute />
+      </MemoryRouter>
+    )
 
-    expect(screen.getByTestId('gross-revenue')).toHaveTextContent('$1,038,807')
+    expect(screen.getByTestId('gross-revenue')).toHaveTextContent('$831,046')
 
     await userEvent.clear(screen.getByLabelText('Reviews'))
     await userEvent.type(screen.getByLabelText('Reviews'), '2300')
 
     await userEvent.clear(screen.getByLabelText('Price'))
     await userEvent.type(screen.getByLabelText('Price'), '6.99')
 
-    expect(screen.getByTestId('gross-revenue')).toHaveTextContent('$723,465')
+    expect(screen.getByTestId('gross-revenue')).toHaveTextContent('$578,772')
 
-    expect(screen.getByTestId('net-revenue')).toHaveTextContent('$213,422.18')
+    expect(screen.getByTestId('net-revenue')).toHaveTextContent('$170,737.74')
   })
 })