tests(code_sig): first tests for code_signature, passing vec! string

Author: dfayd0

tests/code_signature_test.rs

@@ -0,0 +1,32 @@
+use leetcode_cli::code_signature::*;
+use leetcoderustapi::ProgrammingLanguage::*;
+
+#[test]
+fn test_code_signature_resolve_declaration_rust_number() {
+    let result = CodeSignature::resolve_declaration(&Rust, "42");
+    assert_eq!(result, "42");
+}
+
+#[test]
+fn test_code_signature_resolve_declaration_rust_string() {
+    let result = CodeSignature::resolve_declaration(&Rust, "\"Hello, World!\"");
+    assert_eq!(result, "\"Hello, World!\".to_string()");
+}
+
+#[test]
+fn test_code_signature_resolve_declaration_rust_vector() {
+    let result = CodeSignature::resolve_declaration(&Rust, "[1, 2, 3]");
+    assert_eq!(result, "vec![1, 2, 3]");
+}
+
+#[test]
+fn test_code_signature_resolve_declaration_rust_vec_of_strings() {
+    let result = CodeSignature::resolve_declaration(
+        &Rust,
+        "[\"abc\", \"bde\", \"cfg\"]",
+    );
+    assert_eq!(
+        result,
+        "vec![\"abc\".to_string(), \"bde\".to_string(), \"cfg\".to_string()]"
+    );
+}