From 5fabb4424c724b69b25d3ea0dd47cd9abee046c1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Gonz=C3=A1lez?=
 <alvarogonzalezsotillo@gmail.com>
Date: Thu, 5 Mar 2026 12:47:10 +0100
Subject: [PATCH] Some tests, seems it is working

---
 test/formula_solver_test.dart | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/test/formula_solver_test.dart b/test/formula_solver_test.dart
index 3ad65c0..2714a5f 100644
--- a/test/formula_solver_test.dart
+++ b/test/formula_solver_test.dart
@@ -1,6 +1,7 @@
 import 'package:d4rt_formulas/formula_evaluator.dart';
 import 'package:d4rt_formulas/formula_models.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'dart:math' as Math;
 
 
 void main() {
@@ -10,6 +11,13 @@ void main() {
     expect(root, closeTo(0, 0.1));
   });
 
+
+  test("Solve (x-1000)^2", () {
+    Number f(Number x) => (x-1000)*(x-1000);
+    var root = functionSolver(f, hint: 10, step: 1, maxTries: 1000);
+    expect(root, closeTo(1000, 0.1));
+  });
+
   test("Solve x^2 + 1", () {
     Number f(Number x) => x*x+1;
 
@@ -22,5 +30,28 @@ void main() {
     expect( functionSolver(f, hint: 10, step: 1), closeTo(10, 0.1));
   });
 
+  test('Solve sqrt(x) = 2  => x = 4', () {
+    Number f(Number x) => Math.sqrt(x) - 2;
+    var root = functionSolver(f, hint: 5, step: 1);
+    expect(root, closeTo(4, 0.1));
+  });
+
+  test('Solve sin(x) = 0 near pi (hint 3)', () {
+    Number f(Number x) => Math.sin(x);
+    var root = functionSolver(f, hint: 3, step: 1);
+    expect(root, closeTo(Math.pi, 0.01));
+  });
+
+  test('Solve tan(x) = 1 => x = pi/4', () {
+    Number f(Number x) => Math.tan(x) - 1;
+    var root = functionSolver(f, hint: 0, step: 1);
+    expect(root, closeTo(Math.pi / 4, 0.01));
+  });
+
+  test('Solve exp(x) = 2 => x = ln(2)', () {
+    Number f(Number x) => Math.exp(x) - 2;
+    var root = functionSolver(f, hint: 1, step: 1);
+    expect(root, closeTo(Math.log(2), 0.01));
+  });
 
 }