Add database query builder test

tests/DatabaseQueryBuilderTest.php

@@ -0,0 +1,25 @@
+<?php
+
+use Workbench\App\Models\Product;
+
+it('boundary constraints', function ($method, $column, $value, $sql) {
+    expect(Product::query()->{$method}($column, $value)->toRawSql())->toEqual($sql);
+})->with([
+    // Greater
+    ['whereGreaterThan', 'price', 500, 'select * from "products" where "price" > 500'],
+    ['whereGreaterThanOrEqual', 'price', 500, 'select * from "products" where "price" >= 500'],
+    ['whereColumnGreaterThan', 'price', 'amount', 'select * from "products" where "price" > "amount"'],
+    ['whereColumnGreaterThanOrEqual', 'price', "amount", 'select * from "products" where "price" >= "amount"'],
+    // Less
+    ['whereLessThan', 'price', 500, 'select * from "products" where "price" < 500'],
+    ['whereLessThanOrEqual', 'price', 500, 'select * from "products" where "price" <= 500'],
+    ['whereColumnLessThan', 'price', 'amount', 'select * from "products" where "price" < "amount"'],
+    ['whereColumnLessThanOrEqual', 'price', "amount", 'select * from "products" where "price" <= "amount"'],
+]);
+
+it('conditional constraints', function ($value, $column, $sql) {
+    expect(Product::query()->whenWhere($value, $column)->toRawSql())->toEqual($sql);
+})->with([
+    [true, 'is_active', 'select * from "products" where "is_active" = 1'],
+    [false, 'is_active', 'select * from "products"'],
+]);

workbench/app/Models/Product.php

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+<?php
+
+namespace Workbench\App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Product extends Model
+{
+}