Drop single-file mode of black box codegen tests

Add regression test for #KT-5190

compiler/java8-tests/tests/org/jetbrains/kotlin/codegen/BlackBoxWithJava8CodegenTestGenerated.java

@@ -89,6 +89,12 @@ public class BlackBoxWithJava8CodegenTestGenerated extends AbstractBlackBoxCodeg
         doTest(fileName);
     }
 
+    @TestMetadata("useStream.kt")
+    public void testUseStream() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/java8/box/useStream.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("compiler/testData/codegen/java8/box/reflection")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)

compiler/testData/codegen/java8/box/useStream.kt

@@ -0,0 +1,13 @@
+// KT-5190 Java 8 Stream.collect couldn't be called
+// FULL_JDK
+
+import java.util.stream.Collectors
+import java.util.stream.Stream
+
+fun box(): String {
+    val mutableListOf = mutableListOf("OK", "B", "C")
+
+    return test((mutableListOf as java.util.Collection<String>).stream()) as String
+}
+
+fun test(a: Stream<String>) = a.collect(Collectors.toList()).first()

compiler/tests/org/jetbrains/kotlin/codegen/AbstractBlackBoxCodegenTest.java

@@ -55,13 +55,17 @@ import static org.jetbrains.kotlin.test.KotlinTestUtils.getAnnotationsJar;
 public abstract class AbstractBlackBoxCodegenTest extends CodegenTestCase {
     @Override
     protected void doMultiFileTest(@NotNull File wholeFile, @NotNull List<TestFile> files, @Nullable File javaFilesDir) throws Exception {
-        if (files.size() == 1) {
-            createEnvironmentWithMockJdkAndIdeaAnnotations(ConfigurationKind.JDK_ONLY);
-            blackBoxFileByFullPath(wholeFile.getPath());
-        }
-        else {
-            doTestMultiFile(files, javaFilesDir);
+        TestJdkKind jdkKind = TestJdkKind.MOCK_JDK;
+        List<String> javacOptions = new ArrayList<String>(0);
+        for (TestFile file : files) {
+            if (isFullJdkDirectiveDefined(file.content)) {
+                jdkKind = TestJdkKind.FULL_JDK;
+                break;
+            }
+            javacOptions.addAll(InTextDirectivesUtils.findListWithPrefixes(file.content, "// JAVAC_OPTIONS:"));
         }
+
+        compileAndRun(files, javaFilesDir, jdkKind, javacOptions);
     }
 
     protected void doTestWithStdlib(@NotNull String filename) {
@@ -76,20 +80,6 @@ public abstract class AbstractBlackBoxCodegenTest extends CodegenTestCase {
         blackBoxFileByFullPath(filename);
     }
 
-    private void doTestMultiFile(@NotNull List<TestFile> files, @Nullable File javaSourceDir) {
-        TestJdkKind jdkKind = TestJdkKind.MOCK_JDK;
-        List<String> javacOptions = new ArrayList<String>(0);
-        for (TestFile file : files) {
-            if (isFullJdkDirectiveDefined(file.content)) {
-                jdkKind = TestJdkKind.FULL_JDK;
-                break;
-            }
-            javacOptions.addAll(InTextDirectivesUtils.findListWithPrefixes(file.content, "// JAVAC_OPTIONS:"));
-        }
-
-        compileAndRun(files, javaSourceDir, jdkKind, javacOptions);
-    }
-
     protected void compileAndRun(
             @NotNull List<TestFile> files,
             @Nullable File javaSourceDir,