Test: add java source files as JavaSourceRoot

so that those can be properly populated in SingleJavaRootsIndex

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericClass.fir.kt

@@ -1,14 +0,0 @@
-// JAVAC_EXPECTED_FILE
-// FILE: KotlinFile.kt
-fun foo(javaClass: JavaClass<String>): String {
-    return javaClass.doSomething("", 1) <!ARGUMENT_TYPE_MISMATCH!>{ s: String -> "" }<!>
-}
-
-// FILE: JavaClass.java
-public class JavaClass<T> {
-    public T doSomething(T t, int anInt, I<T> i) { return t; }
-}
-
-interface I<T> {
-    T doIt(T t);
-}

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericClass.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // JAVAC_EXPECTED_FILE
 // FILE: KotlinFile.kt
 fun foo(javaClass: JavaClass<String>): String {

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericClass.txt

@@ -2,6 +2,13 @@ package
 
 public fun foo(/*0*/ javaClass: JavaClass<kotlin.String>): kotlin.String
 
+public/*package*/ interface I</*0*/ T : kotlin.Any!> {
+    public abstract fun doIt(/*0*/ t: T!): T!
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
 public open class JavaClass</*0*/ T : kotlin.Any!> {
     public constructor JavaClass</*0*/ T : kotlin.Any!>()
     public open fun doSomething(/*0*/ t: T!, /*1*/ anInt: kotlin.Int, /*2*/ i: I<T!>!): T!

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericMethod.fir.kt

@@ -1,14 +0,0 @@
-// JAVAC_EXPECTED_FILE
-// FILE: KotlinFile.kt
-fun foo(javaClass: JavaClass): String {
-    return javaClass.doSomething("") <!ARGUMENT_TYPE_MISMATCH!>{ <!ARGUMENT_TYPE_MISMATCH, UNRESOLVED_REFERENCE!>it<!> }<!>
-}
-
-// FILE: JavaClass.java
-public class JavaClass {
-    public <T> T doSomething(T t, I<T> i) { return i.run(t); }
-}
-
-interface I<T> {
-    T run(T t);
-}

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericMethod.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // JAVAC_EXPECTED_FILE
 // FILE: KotlinFile.kt
 fun foo(javaClass: JavaClass): String {

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericMethod.txt

@@ -2,6 +2,13 @@ package
 
 public fun foo(/*0*/ javaClass: JavaClass): kotlin.String
 
+public/*package*/ interface I</*0*/ T : kotlin.Any!> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public abstract fun run(/*0*/ t: T!): T!
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
 public open class JavaClass {
     public constructor JavaClass()
     public open fun </*0*/ T : kotlin.Any!> doSomething(/*0*/ t: T!, /*1*/ i: I<T!>!): T!

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericMethodInGenericClass.fir.kt

@@ -1,16 +0,0 @@
-// JAVAC_EXPECTED_FILE
-// FILE: KotlinFile.kt
-fun foo(javaClass: JavaClass<Int>) {
-    val a: String = javaClass.doSomething1("", 1) <!ARGUMENT_TYPE_MISMATCH!>{ p: String -> p }<!>
-    val b: String = javaClass.doSomething2("", 1, true) <!ARGUMENT_TYPE_MISMATCH!>{ p: Int -> p }<!>
-}
-
-// FILE: JavaClass.java
-public class JavaClass<X> {
-    public <T> T doSomething1(T t, X x, I<T> i) { return i.run(t); }
-    public <T> T doSomething2(T t, X x, boolean p, I<X> i) { return i.run(t); }
-}
-
-interface I<T> {
-    T run(T t);
-}

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericMethodInGenericClass.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // JAVAC_EXPECTED_FILE
 // FILE: KotlinFile.kt
 fun foo(javaClass: JavaClass<Int>) {

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericMethodInGenericClass.txt

@@ -2,6 +2,13 @@ package
 
 public fun foo(/*0*/ javaClass: JavaClass<kotlin.Int>): kotlin.Unit
 
+public/*package*/ interface I</*0*/ T : kotlin.Any!> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public abstract fun run(/*0*/ t: T!): T!
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
 public open class JavaClass</*0*/ X : kotlin.Any!> {
     public constructor JavaClass</*0*/ X : kotlin.Any!>()
     public open fun </*0*/ T : kotlin.Any!> doSomething1(/*0*/ t: T!, /*1*/ x: X!, /*2*/ i: I<T!>!): T!