IDEA-187224: test fixed (beforeStringSubstringLength.java was not added mistakenly)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/redundantStringOperation/beforeStringSubstringLength.java

@@ -0,0 +1,7 @@
+// "Fix all 'Redundant String operation' problems in file" "true"
+class Foo {
+  void test(String s) {
+    String s1 = s.substring(1, s.leng<caret>th());
+    String s2 = s.substring(2, s1.length());
+  }
+}