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state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/analysis/service/VariableTracerTest.java

@@ -0,0 +1,69 @@
+package click.kamil.springstatemachineexporter.analysis.service;
+
+import click.kamil.springstatemachineexporter.analysis.resolver.ConstantResolver;
+import click.kamil.springstatemachineexporter.ast.common.CodebaseContext;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class VariableTracerTest {
+
+    @Test
+    void shouldShortCircuitLiteralStringResolution() {
+        CodebaseContext context = new CodebaseContext();
+        VariableTracer tracer = new VariableTracer(context, new ConstantResolver());
+
+        // Even with an empty context and call graph, passing a raw String literal should return instantly
+        // without trying to recursively traverse the path or crash.
+        String resolved = tracer.resolveArgumentValue("\"PAY_EVENT\"", "com.example.Order.process", List.of("com.example.Order.process"), 0, Map.of());
+        
+        assertThat(resolved).isEqualTo("\"PAY_EVENT\"");
+    }
+
+    @Test
+    void shouldBridgePolymorphicParametersPositionally(@TempDir Path tempDir) throws IOException {
+        Path comFoo = tempDir.resolve("com/foo");
+        Files.createDirectories(comFoo);
+        
+        // Setup an interface and implementation with DIFFERENT parameter names
+        Files.writeString(comFoo.resolve("PaymentService.java"),
+            "package com.foo;\n" +
+            "public interface PaymentService {\n" +
+            "    void submit(String eventName);\n" +
+            "}"
+        );
+        Files.writeString(comFoo.resolve("PaymentServiceImpl.java"),
+            "package com.foo;\n" +
+            "public class PaymentServiceImpl implements PaymentService {\n" +
+            "    @Override\n" +
+            "    public void submit(String e) {}\n" +
+            "}"
+        );
+
+        CodebaseContext context = new CodebaseContext();
+        context.scan(tempDir);
+
+        VariableTracer tracer = new VariableTracer(context, new ConstantResolver());
+
+        // Simulate tracing from the Interface backwards to the Implementation.
+        // Because this is a polymorphic bridge, there is NO direct call edge in the AST call graph.
+        Map<String, String> params = tracer.buildParameterValuesMap(
+                "com.foo.PaymentService.submit", 
+                "com.foo.PaymentServiceImpl.submit", 
+                Map.of(), // Empty call graph (no direct edges)
+                List.of("com.foo.PaymentService.submit", "com.foo.PaymentServiceImpl.submit"), 
+                0
+        );
+
+        // The tracer should have scanned both ASTs and mapped parameter 0 -> parameter 0
+        assertThat(params).hasSize(1);
+        assertThat(params).containsEntry("e", "eventName");
+    }
+}