FIR IDE: abstract low-level-api from dependency on idea

compiler/tests-common/tests/org/jetbrains/kotlin/test/KotlinTestUtils.java

@@ -60,6 +60,7 @@ import java.io.File;
 import java.io.IOException;
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Method;
+import java.nio.file.Path;
 import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -272,6 +273,10 @@ public class KotlinTestUtils {
         assertEqualsToFile(expectedFile, afterText);
     }
 
+    public static void assertEqualsToFile(@NotNull Path expectedFile, @NotNull String actual) {
+        assertEqualsToFile(expectedFile.toFile(), actual);
+    }
+
     public static void assertEqualsToFile(@NotNull File expectedFile, @NotNull String actual) {
         assertEqualsToFile(expectedFile, actual, s -> s);
     }