diff --git a/tests/Console/ModelsCommand/CustomPhpdocTags/Models/Simple.php b/tests/Console/ModelsCommand/CustomPhpdocTags/Models/Simple.php
new file mode 100644
index 000000000..368ad1cc3
--- /dev/null
+++ b/tests/Console/ModelsCommand/CustomPhpdocTags/Models/Simple.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\CustomPhpdocTags\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * The `@SuppressWarnings` tag below contains no space before the `(` but when
+ * the class phpdoc is written back, one is inserted.
+ *
+ * @link https://github.com/barryvdh/laravel-ide-helper/issues/666
+ *
+ * @SuppressWarnings(PHPMD.ExcessiveClassComplexity)
+ */
+class Simple extends Model
+{
+}
diff --git a/tests/Console/ModelsCommand/CustomPhpdocTags/Test.php b/tests/Console/ModelsCommand/CustomPhpdocTags/Test.php
new file mode 100644
index 000000000..5da1611a5
--- /dev/null
+++ b/tests/Console/ModelsCommand/CustomPhpdocTags/Test.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\CustomPhpdocTags;
+
+use Barryvdh\LaravelIdeHelper\Console\ModelsCommand;
+use Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\AbstractModelsCommand;
+
+class Test extends AbstractModelsCommand
+{
+    /**
+     * This test shows that, when adding custom phpdoc tags with a parameter
+     * but without a space, they're changed when writing break, possibly breaking
+     * tools.
+     *
+     * It is changed from
+     * - `@SuppressWarnings(PHPMD.ExcessiveClassComplexity)`
+     *   to
+     * - `@SuppressWarnings (PHPMD.ExcessiveClassComplexity)`
+     *
+     * If this test fails because the issue has been fixed, please keep the
+     * test but adjust it and it's comments, to prevent this from every breaking
+     * again.
+     *
+     * @link https://github.com/barryvdh/laravel-ide-helper/issues/666
+     */
+    public function testNoSpaceAfterCustomPhpdocTag(): void
+    {
+        $command = $this->app->make(ModelsCommand::class);
+
+        $tester = $this->runCommand($command, [
+            '--write' => true,
+        ]);
+
+        $this->assertSame(0, $tester->getStatusCode());
+        $this->assertStringContainsString('Written new phpDocBlock to', $tester->getDisplay());
+        $this->assertMatchesMockedSnapshot();
+    }
+}
diff --git a/tests/Console/ModelsCommand/CustomPhpdocTags/__snapshots__/Test__testNoSpaceAfterCustomPhpdocTag__1.php b/tests/Console/ModelsCommand/CustomPhpdocTags/__snapshots__/Test__testNoSpaceAfterCustomPhpdocTag__1.php
new file mode 100644
index 000000000..9d9fb49f7
--- /dev/null
+++ b/tests/Console/ModelsCommand/CustomPhpdocTags/__snapshots__/Test__testNoSpaceAfterCustomPhpdocTag__1.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\CustomPhpdocTags\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * The `@SuppressWarnings` tag below contains no space before the `(` but when
+ * the class phpdoc is written back, one is inserted.
+ *
+ * @link https://github.com/barryvdh/laravel-ide-helper/issues/666
+ * @SuppressWarnings (PHPMD.ExcessiveClassComplexity)
+ * @property integer $id
+ * @method static \Illuminate\Database\Eloquent\Builder|Simple newModelQuery()
+ * @method static \Illuminate\Database\Eloquent\Builder|Simple newQuery()
+ * @method static \Illuminate\Database\Eloquent\Builder|Simple query()
+ * @method static \Illuminate\Database\Eloquent\Builder|Simple whereId($value)
+ * @mixin \Eloquent
+ */
+class Simple extends Model
+{
+}