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Added Calculator and Calculator Unit Test
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‎.phpunit.result.cache

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C:37:"PHPUnit\Runner\DefaultTestResultCache":3005:{a:2:{s:7:"defects";a:23:{s:7:"Warning";i:6;s:33:"SampleTest::testTrueAssertsToTrue";i:3;s:38:"UserTest::testThatWeCanGetTheFirstName";i:3;s:37:"UserTest::testThatWeCanGetTheLastName";i:4;s:36:"UserTest::testThatFullNameIsReturned";i:4;s:40:"UserTest::testFirstAndLastNameAreTrimmed";i:3;s:34:"UserTest::testEmailAddressCanBeSet";i:4;s:48:"UserTest::testEmailVariablesContainCorrectValues";i:4;s:40:"UserTest::that_we_can_get_the_first_name";i:3;s:62:"CollectionTest::empty_instantiated_collection_returns_no_items";i:4;s:52:"CollectionTest::count_is_correct_for_items_passed_in";i:3;s:52:"CollectionTest::items_returned_match_items_passed_in";i:4;s:60:"CollectionTest::collection_is_instance_of_iterator_aggregate";i:3;s:42:"CollectionTest::collection_can_be_iterated";i:4;s:64:"CollectionTest::collection_can_be_merged_with_another_collection";i:4;s:46:"CollectionTest::can_add_to_existing_collection";i:4;s:42:"CollectionTest::returns_json_encoded_items";i:6;s:62:"CollectionTest::json_encoding_a_collection_object_returns_json";i:3;s:36:"AdditionTest::adds_up_given_operands";i:4;s:65:"AdditionTest::no_operands_given_throws_exception_when_calculating";i:4;s:36:"DivisionTest::divides_given_operands";i:4;s:47:"DivisionTest::removes_division_by_zero_operands";i:4;s:65:"DivisionTest::no_operands_given_throws_exception_when_calculating";i:3;}s:5:"times";a:28:{s:7:"Warning";d:0.607;s:33:"SampleTest::testTrueAssertsToTrue";d:0.001;s:38:"UserTest::testThatWeCanGetTheFirstName";d:0.001;s:37:"UserTest::testThatWeCanGetTheLastName";d:0;s:36:"UserTest::testThatFullNameIsReturned";d:0;s:40:"UserTest::testFirstAndLastNameAreTrimmed";d:0;s:34:"UserTest::testEmailAddressCanBeSet";d:0;s:48:"UserTest::testEmailVariablesContainCorrectValues";d:0.001;s:40:"UserTest::that_we_can_get_the_first_name";d:0.001;s:39:"UserTest::that_we_can_get_the_last_name";d:0;s:36:"UserTest::that_full_name_is_returned";d:0;s:46:"UserTest::that_first_and_last_name_are_trimmed";d:0;s:39:"UserTest::that_email_address_can_be_set";d:0;s:53:"UserTest::that_email_variables_contain_correct_values";d:0.001;s:62:"CollectionTest::empty_instantiated_collection_returns_no_items";d:0.009;s:52:"CollectionTest::count_is_correct_for_items_passed_in";d:0.001;s:52:"CollectionTest::items_returned_match_items_passed_in";d:0.001;s:60:"CollectionTest::collection_is_instance_of_iterator_aggregate";d:0;s:42:"CollectionTest::collection_can_be_iterated";d:0;s:64:"CollectionTest::collection_can_be_merged_with_another_collection";d:0;s:46:"CollectionTest::can_add_to_existing_collection";d:0;s:42:"CollectionTest::returns_json_encoded_items";d:0;s:62:"CollectionTest::json_encoding_a_collection_object_returns_json";d:0;s:36:"AdditionTest::adds_up_given_operands";d:0.001;s:65:"AdditionTest::no_operands_given_throws_exception_when_calculating";d:0.002;s:36:"DivisionTest::divides_given_operands";d:0.001;s:47:"DivisionTest::removes_division_by_zero_operands";d:0;s:65:"DivisionTest::no_operands_given_throws_exception_when_calculating";d:0;}}}
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C:37:"PHPUnit\Runner\DefaultTestResultCache":3635:{a:2:{s:7:"defects";a:28:{s:7:"Warning";i:6;s:33:"SampleTest::testTrueAssertsToTrue";i:3;s:38:"UserTest::testThatWeCanGetTheFirstName";i:3;s:37:"UserTest::testThatWeCanGetTheLastName";i:4;s:36:"UserTest::testThatFullNameIsReturned";i:4;s:40:"UserTest::testFirstAndLastNameAreTrimmed";i:3;s:34:"UserTest::testEmailAddressCanBeSet";i:4;s:48:"UserTest::testEmailVariablesContainCorrectValues";i:4;s:40:"UserTest::that_we_can_get_the_first_name";i:3;s:62:"CollectionTest::empty_instantiated_collection_returns_no_items";i:4;s:52:"CollectionTest::count_is_correct_for_items_passed_in";i:3;s:52:"CollectionTest::items_returned_match_items_passed_in";i:4;s:60:"CollectionTest::collection_is_instance_of_iterator_aggregate";i:3;s:42:"CollectionTest::collection_can_be_iterated";i:4;s:64:"CollectionTest::collection_can_be_merged_with_another_collection";i:4;s:46:"CollectionTest::can_add_to_existing_collection";i:4;s:42:"CollectionTest::returns_json_encoded_items";i:6;s:62:"CollectionTest::json_encoding_a_collection_object_returns_json";i:3;s:36:"AdditionTest::adds_up_given_operands";i:4;s:65:"AdditionTest::no_operands_given_throws_exception_when_calculating";i:4;s:36:"DivisionTest::divides_given_operands";i:4;s:47:"DivisionTest::removes_division_by_zero_operands";i:4;s:65:"DivisionTest::no_operands_given_throws_exception_when_calculating";i:3;s:40:"CalculatorTest::can_set_single_operation";i:4;s:43:"CalculatorTest::can_set_multiple_operations";i:4;s:77:"CalculatorTest::operations_are_ignored_if_not_instance_of_operation_interface";i:3;s:36:"CalculatorTest::can_calculate_result";i:4;s:57:"CalculatorTest::calculate_method_returns_multiple_results";i:6;}s:5:"times";a:33:{s:7:"Warning";d:0.607;s:33:"SampleTest::testTrueAssertsToTrue";d:0;s:38:"UserTest::testThatWeCanGetTheFirstName";d:0.001;s:37:"UserTest::testThatWeCanGetTheLastName";d:0;s:36:"UserTest::testThatFullNameIsReturned";d:0;s:40:"UserTest::testFirstAndLastNameAreTrimmed";d:0;s:34:"UserTest::testEmailAddressCanBeSet";d:0;s:48:"UserTest::testEmailVariablesContainCorrectValues";d:0.001;s:40:"UserTest::that_we_can_get_the_first_name";d:0.013;s:39:"UserTest::that_we_can_get_the_last_name";d:0.004;s:36:"UserTest::that_full_name_is_returned";d:0;s:46:"UserTest::that_first_and_last_name_are_trimmed";d:0;s:39:"UserTest::that_email_address_can_be_set";d:0;s:53:"UserTest::that_email_variables_contain_correct_values";d:0.001;s:62:"CollectionTest::empty_instantiated_collection_returns_no_items";d:0.012;s:52:"CollectionTest::count_is_correct_for_items_passed_in";d:0.001;s:52:"CollectionTest::items_returned_match_items_passed_in";d:0.001;s:60:"CollectionTest::collection_is_instance_of_iterator_aggregate";d:0.001;s:42:"CollectionTest::collection_can_be_iterated";d:0;s:64:"CollectionTest::collection_can_be_merged_with_another_collection";d:0;s:46:"CollectionTest::can_add_to_existing_collection";d:0;s:42:"CollectionTest::returns_json_encoded_items";d:0.001;s:62:"CollectionTest::json_encoding_a_collection_object_returns_json";d:0;s:36:"AdditionTest::adds_up_given_operands";d:0.001;s:65:"AdditionTest::no_operands_given_throws_exception_when_calculating";d:0.001;s:36:"DivisionTest::divides_given_operands";d:0;s:47:"DivisionTest::removes_division_by_zero_operands";d:0;s:65:"DivisionTest::no_operands_given_throws_exception_when_calculating";d:0;s:40:"CalculatorTest::can_set_single_operation";d:0;s:43:"CalculatorTest::can_set_multiple_operations";d:0;s:77:"CalculatorTest::operations_are_ignored_if_not_instance_of_operation_interface";d:0;s:36:"CalculatorTest::can_calculate_result";d:0;s:57:"CalculatorTest::calculate_method_returns_multiple_results";d:0;}}}

‎app/Calculator/Calculator.php

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<?php
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namespace App\Calculator;
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class Calculator {
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protected $operations = [];
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public function setOperation(OperationInterface $operation) {
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$this->operations[] = $operation;
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}
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public function getOperations() {
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return $this->operations;
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}
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public function setOperations(array $operations) {
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$filteredOperations = array_filter($operations, function($operation) {
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return $operation instanceof OperationInterface;
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});
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$this->operations = array_merge($this->operations, $filteredOperations);
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}
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public function calculate() {
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if (count($this->operations) > 1) {
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// $result = [];
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// foreach($this->operations as $operation) {
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// $result[] = $operation->calculate();
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// }
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// return $result;
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return array_map(function($operation) {
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return $operation->calculate();
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}, $this->operations);
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}
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return $this->operations[0]->calculate();
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}
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}

‎tests/unit/calculator/CalculatorTest.php

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<?php
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class CalculatorTest extends \PHPUnit\Framework\TestCase {
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/** @test */
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public function can_set_single_operation() {
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$addition = new \App\Calculator\Addition;
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$addition->setOperands([5, 10]);
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$calculator = new \App\Calculator\Calculator;
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$calculator->setOperation($addition);
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$this->assertCount(1, $calculator->getOperations());
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}
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/** @test */
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public function can_set_multiple_operations() {
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$addition1 = new \App\Calculator\Addition;
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$addition1->setOperands([5, 10]);
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$addition2 = new \App\Calculator\Addition;
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$addition2->setOperands([2, 2]);
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$calculator = new \App\Calculator\Calculator;
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$calculator->setOperations([$addition1, $addition2]);
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$this->assertCount(2, $calculator->getOperations());
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}
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/** @test */
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public function operations_are_ignored_if_not_instance_of_operation_interface() {
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$addition = new \App\Calculator\Addition;
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$addition->setOperands([5, 2]);
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$calculator = new \App\Calculator\Calculator;
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$calculator->setOperations([$addition, 'cats']);
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$this->assertCount(1, $calculator->getOperations());
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}
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/** @test */
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public function can_calculate_result() {
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$addition = new \App\Calculator\Addition;
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$addition->setOperands([2, 5]);
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$calculator = new \App\Calculator\Calculator;
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$calculator->setOperation($addition);
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$this->assertEquals(7, $calculator->calculate());
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}
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/** @test */
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public function calculate_method_returns_multiple_results() {
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$addition = new \App\Calculator\Addition;
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$addition->setOperands([5, 10]); // 15
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$division = new \App\Calculator\Division;
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$division->setOperands([50, 2]); // 25
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$calculator = new \App\Calculator\Calculator;
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$calculator->setOperations([$addition, $division]);
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// [15, 25]
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$this->assertIsArray($calculator->calculate());
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$this->assertEquals(15, $calculator->calculate()[0]);
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$this->assertEquals(25, $calculator->calculate()[1]);
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}
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}

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