diff --git a/tests/PHPStan/Analyser/nsrt/string-offsets.php b/tests/PHPStan/Analyser/nsrt/string-offsets.php
index 6a2c272882..6fc8eeabd0 100644
--- a/tests/PHPStan/Analyser/nsrt/string-offsets.php
+++ b/tests/PHPStan/Analyser/nsrt/string-offsets.php
@@ -9,10 +9,11 @@
  * @param int<3, 10> $threeToTen
  * @param int<10, max> $tenOrMore
  * @param int<-10, -5> $negative
+ * @param lowercase-string $lowercase
  *
  * @return void
  */
-function doFoo($oneToThree, $threeToTen, $tenOrMore, $negative, int $i) {
+function doFoo($oneToThree, $threeToTen, $tenOrMore, $negative, int $i, string $lowercase) {
 	$s = "world";
 	if (rand(0, 1)) {
 		$s = "hello";
@@ -29,4 +30,6 @@ function doFoo($oneToThree, $threeToTen, $tenOrMore, $negative, int $i) {
 
 	$longString = "myF5HnJv799kWf8VRI7g97vwnABTwN9y2CzAVELCBfRqyqkdTzXg7BkGXcwuIOscAiT6tSuJGzVZOJnYXvkiKQzYBNjjkCPOzSKXR5YHRlVxV1BetqZz4XOmaH9mtacJ9azNYL6bNXezSBjX13BSZy02SK2udzQLbTPNQwlKadKaNkUxjtWegkb8QDFaXbzH1JENVSLVH0FYd6POBU82X1xu7FDDKYLzwsWJHBGVhG8iugjEGwLj22x5ViosUyKR";
 	assertType("non-empty-string", $longString[$i]);
+
+	assertType("lowercase-string&non-empty-string", $lowercase[$i]);
 }
diff --git a/tests/PHPStan/Type/Constant/ConstantStringTypeTest.php b/tests/PHPStan/Type/Constant/ConstantStringTypeTest.php
index 3845352fd6..036d2b0f1f 100644
--- a/tests/PHPStan/Type/Constant/ConstantStringTypeTest.php
+++ b/tests/PHPStan/Type/Constant/ConstantStringTypeTest.php
@@ -154,6 +154,7 @@ public function testGeneralize(): void
 		$this->assertSame('literal-string&non-falsy-string', (new ConstantStringType('NonexistentClass'))->generalize(GeneralizePrecision::moreSpecific())->describe(VerbosityLevel::precise()));
 		$this->assertSame('literal-string', (new ConstantStringType(''))->generalize(GeneralizePrecision::moreSpecific())->describe(VerbosityLevel::precise()));
 		$this->assertSame('literal-string&lowercase-string&non-falsy-string', (new ConstantStringType('a'))->generalize(GeneralizePrecision::moreSpecific())->describe(VerbosityLevel::precise()));
+		$this->assertSame('literal-string&non-falsy-string', (new ConstantStringType('A'))->generalize(GeneralizePrecision::moreSpecific())->describe(VerbosityLevel::precise()));
 		$this->assertSame('literal-string&lowercase-string&non-empty-string&numeric-string', (new ConstantStringType('0'))->generalize(GeneralizePrecision::moreSpecific())->describe(VerbosityLevel::precise()));
 		$this->assertSame('literal-string&lowercase-string&non-falsy-string&numeric-string', (new ConstantStringType('1.123'))->generalize(GeneralizePrecision::moreSpecific())->describe(VerbosityLevel::precise()));
 		$this->assertSame('literal-string&lowercase-string&non-falsy-string', (new ConstantStringType('    1       1   '))->generalize(GeneralizePrecision::moreSpecific())->describe(VerbosityLevel::precise()));