test: Add test reproducing issue #4021 (#4030)

src/test/java/spoon/test/prettyprinter/TestSniperPrinter.java

@@ -7,6 +7,7 @@
  */
 package spoon.test.prettyprinter;
 
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 import spoon.Launcher;
@@ -40,6 +41,7 @@
 import spoon.support.modelobs.ChangeCollector;
 import spoon.support.modelobs.SourceFragmentCreator;
 import spoon.support.sniper.SniperJavaPrettyPrinter;
+import spoon.test.GitHubIssue;
 import spoon.test.prettyprinter.testclasses.OneLineMultipleVariableDeclaration;
 import spoon.test.prettyprinter.testclasses.Throw;
 import spoon.test.prettyprinter.testclasses.InvocationReplacement;
@@ -772,6 +774,21 @@ void testSniperRespectsDeletionInForUpdate() {
 
 		testSniper("ForLoop", deleteForUpdate, assertNotStaticFindFirstIsEmpty);
 	}
+
+	@Test
+	@Disabled("UnresolvedBug")
+	@GitHubIssue(issueNumber = 4021)
+	void testSniperRespectsSuperWithUnaryOperator() {
+		// Combining CtSuperAccess and CtUnaryOperator leads to SpoonException with Sniper
+
+		// Noop
+		Consumer<CtType<?>> deleteForUpdate = type -> {};
+
+		BiConsumer<CtType<?>, String> assertContainsSuperWithUnaryOperator = (type, result) ->
+				assertThat(result, containsString("super.a(-x);"));
+
+		testSniper("superCall.SuperCallSniperTestClass", deleteForUpdate, assertContainsSuperWithUnaryOperator);
+	}
 
 	/**
 	 * 1) Runs spoon using sniper mode,

src/test/resources/superCall/SuperCallSniperTestClass.java

@@ -0,0 +1,18 @@
+package superCall;
+
+/**
+ * Test class to reproduce issue #4021
+ */
+public class SuperCallSniperTestClass {
+	int m = 0;
+
+	public int a(int x) {
+		return x;
+	}
+}
+
+class Child extends SuperCallSniperTestClass {
+	public int b(int x) {
+		return super.a(-x);
+	}
+}