Added some test cases to deepForEach

package.json

@@ -53,7 +53,7 @@
     "core-js": "3.37.0",
     "del": "6.1.1",
     "dtslint": "4.2.1",
-    "eslint": "8.57.0",
+    "eslint": "^8.57.0",
     "eslint-config-prettier": "9.1.0",
     "eslint-config-standard": "17.1.0",
     "eslint-plugin-import": "2.29.1",

test/unit-tests/type/matrix/utils/deepForEach.test.js

@@ -1 +1,63 @@
-// TODO: test deepForEach
+import assert from 'assert'
+import math from '../../../../../src/defaultInstance.js'
+import { deepForEach } from '../../../../../src/utils/collection.js'
+
+const DenseMatrix = math.DenseMatrix
+
+describe('deepForEach', function () {
+  it('should iterate over all elements in a simple array', function () {
+    const array = [1, 2, 3]
+    const result = []
+    deepForEach(array, value => result.push(value))
+    assert.deepStrictEqual(result, [1, 2, 3])
+  })
+
+  it('should iterate over all elements in a nested array', function () {
+    const array = [[1, 2], [3, [4, 5]]]
+    const result = []
+    deepForEach(array, value => result.push(value))
+    assert.deepStrictEqual(result, [1, 2, 3, 4, 5])
+  })
+
+  it('should iterate over all elements in a mixed type array', function () {
+    const array = [1, 'two', [3, null, undefined, true]]
+    const result = []
+    deepForEach(array, value => result.push(value))
+    assert.deepStrictEqual(result, [1, 'two', 3, null, undefined, true])
+  })
+
+  it('should handle an empty array', function () {
+    const array = []
+    const result = []
+    deepForEach(array, value => result.push(value))
+    assert.deepStrictEqual(result, [])
+  })
+
+  it('should handle an array with empty nested arrays', function () {
+    const array = [[], [1, []], [2, [3, []]]]
+    const result = []
+    deepForEach(array, value => result.push(value))
+    assert.deepStrictEqual(result, [1, 2, 3])
+  })
+
+  it('should iterate over all elements in a DenseMatrix', function () {
+    const matrix = new DenseMatrix([[1, 2], [3, 4]])
+    const result = []
+    deepForEach(matrix, value => result.push(value))
+    assert.deepStrictEqual(result, [1, 2, 3, 4])
+  })
+
+  it('should call the callback with each element of a matrix after converting to array', function () {
+    const matrix = math.matrix([[1, 2], [3, 4]])
+    const result = []
+    deepForEach(matrix, value => result.push(value))
+    assert.deepStrictEqual(result, [1, 2, 3, 4])
+  })
+
+  it('should work with arrays containing complex numbers', function () {
+    const array = [math.complex(2, 3), [math.complex(4, 5)]]
+    const result = []
+    deepForEach(array, value => result.push(value))
+    assert.deepStrictEqual(result, [math.complex(2, 3), math.complex(4, 5)])
+  })
+})