Allow to create quickfix multifile tests in single file

It simplifies creating new tests

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -425,7 +425,7 @@ fun main(args: Array<String>) {
         }
 
         testClass<AbstractQuickFixMultiFileTest>() {
-            model("quickfix", pattern = """^(\w+)\.before\.Main\.\w+$""", testMethod = "doTestWithExtraFile")
+            model("quickfix", pattern = """^(\w+)\.((before\.Main\.\w+)|(test))$""", testMethod = "doTestWithExtraFile")
         }
 
         testClass<AbstractHighlightingTest>() {

generators/src/org/jetbrains/kotlin/generators/tests/generator/SimpleTestMethodModel.java

@@ -109,7 +109,7 @@ public class SimpleTestMethodModel implements TestMethodModel {
         Matcher matcher = filenamePattern.matcher(file.getName());
         boolean found = matcher.find();
         assert found : file.getName() + " isn't matched by regex " + filenamePattern.pattern();
-        assert matcher.groupCount() == 1 : filenamePattern.pattern();
+        assert matcher.groupCount() >= 1 : filenamePattern.pattern();
         String extractedName = matcher.group(1);
         assert extractedName != null : "extractedName should not be null: "  + filenamePattern.pattern();