test: Add Swift test case to TestRepoMapAllLanguages

tests/fixtures/languages/swift/test.swift

@@ -0,0 +1,18 @@
+// Swift greeting example
+class Greeter {
+    let name: String
+    
+    init(name: String) {
+        self.name = name
+    }
+    
+    func greet() -> String {
+        return "Hello, \(name)!"
+    }
+}
+
+// Example usage
+func exampleGreeting() {
+    let greeter = Greeter(name: "World")
+    print(greeter.greet())
+}