Add a test case for InvalidArgumentException and remove the duplicate comment.

Author: maniaba

system/Validation/StrictRules/Rules.php

@@ -218,7 +218,6 @@ public function is_unique($str, string $field, array $data): bool
         // Grab any data for exclusion of a single row.
         [$field, $ignoreField, $ignoreValue] = array_pad(explode(',', $field), 3, null);
 
-        // Break the dbGroup, table and field apart from the field string
         // Break the dbGroup, table and field apart from the field string
         $parts    = explode('.', $field, 3);
         $numParts = count($parts);

tests/system/Validation/StrictRules/DatabaseRelatedRulesTest.php

@@ -108,6 +108,18 @@ public function testIsUniqueWithDBConnectionAsParameter(): void
         $this->assertTrue($result);
     }
 
+    public function testIsUniqueWrongParametersThrowInvalidArgumentException(): void
+    {
+        $this->validation->setRules(['email' => 'is_unique[invalid_parameters]']);
+
+        $data = ['email' => '[email protected]'];
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('The field must be in the format "table.field" or "dbGroup.table.field".');
+
+        $this->validation->run($data);
+    }
+
     public function testIsUniqueWithInvalidDBGroup(): void
     {
         $this->expectException(InvalidArgumentException::class);
@@ -322,4 +334,16 @@ public function testIsNotUniqueWithDBConnectionAsParameter(): void
         $this->validation->setRules(['email' => 'is_not_unique[tests.user.email]']);
         $this->assertTrue($this->validation->run($data));
     }
+
+    public function testIsNotUniqueWrongParametersThrowInvalidArgumentException(): void
+    {
+        $this->validation->setRules(['email' => 'is_not_unique[invalid_parameters]']);
+
+        $data = ['email' => '[email protected]'];
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('The field must be in the format "table.field" or "dbGroup.table.field".');
+
+        $this->validation->run($data);
+    }
 }