[TESTS] Add some basic tests for ModelsCommand (#869)

* tests: add abstract class for all database related tests

* tests: add abstract class for all ModelsCommand related tests

* tests: add GenerateBasicPhpdoc test

* tests: add CustomDate test

* tests: remove MITM abstract TestCaseDatabase, not useful here

* tests: skip new ModelsCommand test on Laravel < 6

* tests: remove CarbonImmutable checked

Since we decided to skip for Laravel < 6.0 anyway, it's always present

tests/Console/ModelsCommand/migrations/____custom_dates_table.php

@@ -0,0 +1,15 @@
+<?php declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CustomDatesTable extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('custom_dates', function (Blueprint $table) {
+            $table->timestamps();
+        });
+    }
+}

tests/Console/ModelsCommand/migrations/____posts_table.php

@@ -0,0 +1,20 @@
+<?php declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class PostsTable extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('posts', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->string('title');
+            $table->string('body')->nullable();
+            $table->boolean('visible')->default('true');
+            $table->timestampTz('publicated_at');
+            $table->timestamps();
+        });
+    }
+}