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tests/Feature/FormulaTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use App\Models\ChecklistTemplate;
+use App\Services\ExpressionEvaluator;
+use App\Services\FormulaService;
+use Database\Seeders\ChecklistTemplateSeeder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class FormulaTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_formula_calculation_works_for_a_b_c_d_e(): void
+    {
+        $this->seed(ChecklistTemplateSeeder::class);
+        $template = ChecklistTemplate::activeTemplate();
+        $service = app(FormulaService::class);
+
+        $vars = ['SKOP1' => 100, 'SKOP2' => 200, 'SKOP3' => 50, 'EE' => 30, 'RE' => 20, 'D4I' => 10, 'D4II' => 15];
+        $results = collect($service->compute($template, $vars))->keyBy('result_token');
+
+        $this->assertEquals(350, $results['A']['value']);          // 100 + 200 + 50
+        $this->assertEquals(50, $results['B']['value']);           // 30 + 20
+        $this->assertEquals(300, $results['C']['value']);          // A - B
+        $this->assertEquals(325, $results['D']['value']);          // A - 10 - 15
+        $this->assertEqualsWithDelta(92.857, $results['E']['value'], 0.01); // D / A * 100
+    }
+
+    public function test_division_by_zero_is_guarded(): void
+    {
+        $this->seed(ChecklistTemplateSeeder::class);
+        $template = ChecklistTemplate::activeTemplate();
+        $service = app(FormulaService::class);
+
+        // Semua sifar => A = 0, formula E (D/A*100) mesti mengembalikan 0, bukan ralat.
+        $vars = ['SKOP1' => 0, 'SKOP2' => 0, 'SKOP3' => 0, 'EE' => 0, 'RE' => 0, 'D4I' => 0, 'D4II' => 0];
+        $results = collect($service->compute($template, $vars))->keyBy('result_token');
+
+        $this->assertEquals(0, $results['E']['value']);
+    }
+
+    public function test_expression_evaluator_respects_operator_precedence(): void
+    {
+        $eval = app(ExpressionEvaluator::class);
+
+        $this->assertEquals(14, $eval->evaluate('2 + 3 * 4'));
+        $this->assertEquals(20, $eval->evaluate('(2 + 3) * 4'));
+        $this->assertEquals(5, $eval->evaluate('A + B', ['A' => 2, 'B' => 3]));
+    }
+
+    public function test_expression_evaluator_rejects_invalid_characters(): void
+    {
+        $this->expectException(\RuntimeException::class);
+        app(ExpressionEvaluator::class)->evaluate('A; DROP TABLE', ['A' => 1]);
+    }
+}