Add test

base/src/test/kotlin/proguard/backport/LambdaExpressionConverterTest.kt

@@ -0,0 +1,78 @@
+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ * of Java bytecode.
+ *
+ * Copyright (c) 2002-2022 Guardsquare NV
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+package proguard.backport
+
+import io.kotest.core.spec.style.FreeSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
+import proguard.classfile.attribute.visitor.AllAttributeVisitor
+import proguard.classfile.editor.InstructionSequenceBuilder
+import proguard.classfile.instruction.visitor.AllInstructionVisitor
+import proguard.classfile.util.InstructionSequenceMatcher
+import proguard.classfile.visitor.ClassPrinter
+import proguard.io.ExtraDataEntryNameMap
+import testutils.ClassPoolBuilder
+import testutils.JavaSource
+
+class LambdaExpressionConverterTest : FreeSpec({
+ "Given a lambda expression" - {
+ val (programClassPool, libraryClassPool) = ClassPoolBuilder.fromSource(
+ JavaSource(
+ "Test.java",
+ """
+ import java.util.function.Function;
+ public class Test {
+ public void test() {
+ foo(s -> s.length());
+ }
+ public void foo(Function<String, Integer> function) {
+ System.out.println(function.apply("Hello")); 
+ }
+ }
+ """.trimIndent()
+ )
+ )
+ programClassPool.classesAccept(ClassPrinter())
+ "When backported" - {
+ val lambdaExpressionConvertor = LambdaExpressionConverter(programClassPool, libraryClassPool, ExtraDataEntryNameMap(), null)
+ programClassPool.classesAccept("Test", lambdaExpressionConvertor)
+ programClassPool.classesAccept(ClassPrinter())
+ "Then a new class should be created" {
+ programClassPool.getClass("Test\$\$Lambda\$0") shouldNotBe null
+ }
+
+ "Then the invocation should call the backported lambda" {
+ val clazz = programClassPool.getClass("Test")
+ val builder = InstructionSequenceBuilder()
+ builder
+ .aload_0()
+ .getstatic("Test\$\$Lambda\$0", "INSTANCE", "LTest\$\$Lambda\$0;")
+ .invokevirtual("Test", "foo", "(Ljava/util/function/Function;)V")
+ .return_()
+
+ val matcher = InstructionSequenceMatcher(builder.constants(), builder.instructions())
+ clazz.methodAccept("test", "()V", AllAttributeVisitor(AllInstructionVisitor(matcher)))
+ matcher.isMatching shouldBe true
+ }
+ }
+ }
+})