From 4e9a0f6cb56f388e4fb89ff4edc2a028fb044845 Mon Sep 17 00:00:00 2001
From: thepaperpilot <thepaperpilot@gmail.com>
Date: Sat, 4 Feb 2023 18:51:11 -0600
Subject: [PATCH] Add some more tests for nested formulas

---
 src/game/formulas.ts        |  2 ++
 tests/game/formulas.test.ts | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/game/formulas.ts b/src/game/formulas.ts
index 7e893be..2ccfbde 100644
--- a/src/game/formulas.ts
+++ b/src/game/formulas.ts
@@ -875,6 +875,8 @@ export default class Formula<T extends [FormulaSource] | FormulaSource[]> {
     }
 
     invertIntegral(value: DecimalSource): DecimalSource {
+        // This is nearly completely non-functional
+        // Proper nesting will require somehow using integration by substitution or integration by parts
         return this.internalInvertIntegral?.call(this, value, ...this.inputs) ?? value;
     }
 
diff --git a/tests/game/formulas.test.ts b/tests/game/formulas.test.ts
index f8b4490..d9be004 100644
--- a/tests/game/formulas.test.ts
+++ b/tests/game/formulas.test.ts
@@ -563,6 +563,11 @@ describe("Inverting", () => {
             })
         );
     });
+
+    test("Inverting nested formulas", () => {
+        const formula = Formula.add(variable, constant).times(constant);
+        expect(formula.invert(100)).compare_tolerance(0);
+    });
 });
 
 describe("Integrating", () => {
@@ -643,6 +648,11 @@ describe("Integrating", () => {
 
     // TODO I think these tests will require writing at least one known example for every function
     describe.todo("Integrable formulas integrate correctly");
+
+    test("Integrating nested formulas", () => {
+        const formula = Formula.add(variable, constant).times(constant);
+        expect(formula.evaluateIntegral()).compare_tolerance(1500);
+    });
 });
 
 describe("Inverting integrals", () => {
@@ -721,6 +731,11 @@ describe("Inverting integrals", () => {
 
     // TODO I think these tests will require writing at least one known example for every function
     describe.todo("Invertible Integral formulas invert correctly");
+
+    test("Inverting integral of nested formulas", () => {
+        const formula = Formula.add(variable, constant).times(constant);
+        expect(formula.invertIntegral(1500)).compare_tolerance(10);
+    });
 });
 
 describe("Step-wise", () => {