Update atan unit tests to comply with maintainer feedback

Author: Abhayaj247

test/unit/math/atan.js

@@ -1,61 +1,33 @@
 import trigonometry from '../../../src/math/trigonometry.js';
-import { vi } from 'vitest';
 import { assert } from 'chai';
 
 suite('atan', function() {
-  // Mock p5 object
   const mockP5 = {
-    _validateParameters: vi.fn(),
     RADIANS: 'radians',
-    DEGREES: 'degrees'
+    DEGREES: 'degrees',
+    _validateParameters: () => {}
   };
-
-  // Mock prototype where trigonometry functions will be attached
   const mockP5Prototype = {};
 
   beforeEach(function() {
-    // Reset angle mode before each test
     mockP5Prototype._angleMode = mockP5.RADIANS;
-
-    // Mock angleMode setter
     mockP5Prototype.angleMode = function(mode) {
       this._angleMode = mode;
     };
-
-    // Initialize trigonometry functions on mock
     trigonometry(mockP5, mockP5Prototype);
-
-    // Save original atan (from trigonometry)
-    const originalAtan = mockP5Prototype.atan;
-
-    // Override atan to handle one-arg and two-arg correctly
-    mockP5Prototype.atan = function(...args) {
-      if (args.length === 1) {
-        // Single-argument: use the original (already handles radians/degrees)
-        return originalAtan.call(this, args[0]);
-      } else if (args.length === 2) {
-        // Two-argument atan(y, x) is GLSL-only, return undefined outside strands
-        return undefined;
-      }
-    };
   });
 
   test('should return the correct value for atan(0.5) in radians', function() {
     mockP5Prototype.angleMode(mockP5.RADIANS);
-    const expected = Math.atan(0.5);
+    const expected = 0.4636476090008061; // pre-calculated value
     const actual = mockP5Prototype.atan(0.5);
     assert.closeTo(actual, expected, 1e-10);
   });
 
   test('should return the correct value for atan(0.5) in degrees', function() {
     mockP5Prototype.angleMode(mockP5.DEGREES);
-    const expected = Math.atan(0.5) * 180 / Math.PI;
+    const expected = 26.56505117707799; // pre-calculated value
     const actual = mockP5Prototype.atan(0.5);
     assert.closeTo(actual, expected, 1e-10);
   });
-
-  test('atan(y, x) outside strands returns undefined', function() {
-    const result = mockP5Prototype.atan(1, 1);
-    assert.isUndefined(result);
-  });
 });