#[cfg_attr(coverage_nightly, coverage(off))]
#[cfg(test)]
mod cb050_falsification {
    use super::*;

    // ========================================================================
    // TRUE POSITIVES: Must detect (tests 001-015)
    // If any of these pass without detection, Hypothesis A is FALSIFIED
    // ========================================================================

    #[test]
    fn tp_001_basic_todo_macro() {
        // Hypothesis: todo!() is detected
        // Falsification attempt: Simplest possible case
        let code = "fn foo() { todo!() }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect basic todo!()"
        );
        assert!(
            violations.iter().any(|(_, id, _)| *id == "CB-050-A"),
            "FALSIFIED: Wrong pattern ID for todo!()"
        );
    }

    #[test]
    fn tp_002_todo_with_message() {
        // Falsification: Does message content break detection?
        let code = r#"fn foo() { todo!("implement later") }"#;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect todo!() with message"
        );
    }

    #[test]
    fn tp_003_unimplemented_macro() {
        let code = "fn bar() { unimplemented!() }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect unimplemented!()"
        );
        assert!(violations.iter().any(|(_, id, _)| *id == "CB-050-B"));
    }

    #[test]
    fn tp_004_panic_not_implemented() {
        let code = r#"fn baz() { panic!("not implemented") }"#;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect panic not implemented"
        );
        assert!(violations.iter().any(|(_, id, _)| *id == "CB-050-C"));
    }

    #[test]
    fn tp_005_empty_function_body() {
        // Adversarial: Minimal whitespace
        let code = "fn empty() {}";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect empty function body"
        );
        assert!(violations.iter().any(|(_, id, _)| *id == "CB-050-D"));
    }

    #[test]
    fn tp_006_empty_function_with_whitespace() {
        // Adversarial: Extra whitespace inside braces
        let code = "fn empty() {   }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect empty body with whitespace"
        );
    }

    #[test]
    fn tp_007_empty_function_multiline() {
        // Adversarial: Multiline empty body
        let code = "fn empty() {\n\n}";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect multiline empty body"
        );
    }

    #[test]
    fn tp_008_python_not_implemented_error() {
        let code = "def foo():\n    raise NotImplementedError()";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect Python NotImplementedError"
        );
        assert!(violations.iter().any(|(_, id, _)| *id == "CB-050-E"));
    }

    #[test]
    fn tp_009_python_not_implemented_with_message() {
        let code = r#"def foo():
    raise NotImplementedError("not done yet")"#;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect NotImplementedError with message"
        );
    }

    #[test]
    fn tp_010_python_pass_stub_comment() {
        let code = "def foo():\n    pass  # stub";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect Python pass stub"
        );
        assert!(violations.iter().any(|(_, id, _)| *id == "CB-050-F"));
    }

    #[test]
    fn tp_011_todo_in_match_arm() {
        // Adversarial: Nested context
        let code = "match x { Some(_) => todo!(), None => 0 }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect todo!() in match arm"
        );
    }

    #[test]
    fn tp_012_todo_in_closure() {
        let code = "let f = || todo!();";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect todo!() in closure"
        );
    }

    #[test]
    fn tp_013_unimplemented_with_formatting() {
        // Adversarial: Complex format string
        let code = r#"fn x() { unimplemented!("{} not done: {}", "feature", 42) }"#;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect unimplemented!() with format"
        );
    }

    #[test]
    fn tp_014_todo_weird_spacing() {
        // Adversarial: Unusual whitespace that might break regex
        let code = "fn f() { todo ! () }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Failed to detect todo with weird spacing"
        );
    }

    #[test]
    fn tp_015_multiple_stubs_one_file() {
        // Adversarial: Multiple stubs - must catch all
        let code = "fn a() { todo!() }\nfn b() { unimplemented!() }\nfn c() {}";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert_eq!(
            violations.len(),
            3,
            "FALSIFIED: Should detect all 3 stubs, found {}",
            violations.len()
        );
    }

    // ========================================================================
    // TRUE NEGATIVES: Must NOT detect (tests 016-025)
    // If any of these trigger detection, Hypothesis A is FALSIFIED (false positive)
    // ========================================================================

    #[test]
    fn tn_016_todo_in_string_literal() {
        // Adversarial: String containing "todo!" should NOT trigger
        let code = r#"let s = "todo!() is a macro";"#;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Detected todo! in string literal"
        );
    }

    #[test]
    fn tn_017_todo_in_comment() {
        // Comments are handled by SATD detector, not stub detector
        let code = "// TODO: implement this\nfn foo() { return 42; }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Detected TODO comment as code stub"
        );
    }

    #[test]
    fn tn_018_function_with_body() {
        let code = "fn not_empty() { println!(\"hello\"); }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Function with body flagged as stub"
        );
    }

    #[test]
    fn tn_019_trait_default_impl() {
        // Empty body in trait default is INTENTIONAL
        let code = "trait Foo { fn default_impl() {} }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Trait default impl flagged as stub"
        );
    }

    #[test]
    fn tn_020_test_function_with_todo() {
        // Stubs in test code are acceptable
        let code = "#[test]\nfn test_future_feature() { todo!() }";
        let violations = detect_cb050_code_stubs_in_str_with_path(code, "src/tests/mod.rs");
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Test stub flagged as violation"
        );
    }

    #[test]
    fn tn_021_doc_comment_with_todo() {
        let code = "/// TODO: document this\nfn foo() { 42 }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Doc comment flagged as stub"
        );
    }

    #[test]
    fn tn_022_raw_string_with_todo() {
        let code = r##"let s = r#"todo!() in raw string"#;"##;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Raw string flagged as stub"
        );
    }

    #[test]
    fn tn_023_macro_definition_with_todo_pattern() {
        // Pattern definition in macro should not trigger
        let code = r#"macro_rules! my_macro { (todo) => { /* ... */ }; }"#;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Macro definition flagged"
        );
    }

    #[test]
    fn tn_024_variable_named_todo() {
        let code = "let todo = 42;";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Variable named 'todo' flagged"
        );
    }

    #[test]
    fn tn_025_function_named_todo() {
        // Function NAMED todo with a real body
        let code = "fn todo() -> i32 { 42 }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Function named 'todo' flagged"
        );
    }

    // ========================================================================
    // EDGE CASES: Adversarial inputs designed to break regex (tests 026-030)
    // These test the boundary of Hypothesis A
    // ========================================================================

    #[test]
    fn edge_026_nested_braces_empty_inner() {
        // Adversarial: Nested braces - only inner is empty
        let code = "fn outer() { { } let x = 1; }";
        let violations = detect_cb050_code_stubs_in_str(code);
        // Should NOT flag - the function has content
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Nested empty braces in function with content"
        );
    }

    #[test]
    fn edge_027_async_fn_with_todo() {
        let code = "async fn foo() { todo!() }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(!violations.is_empty(), "FALSIFIED: Missed todo in async fn");
    }

    #[test]
    fn edge_028_const_fn_empty() {
        // const fn empty might be intentional for type-level programming
        let code = "const fn marker() {}";
        let _violations = detect_cb050_code_stubs_in_str(code);
        // Design decision: This is a gray area - document behavior
        // For now, we detect but with lower severity
    }

    #[test]
    fn edge_029_unicode_in_todo_message() {
        // Adversarial: Unicode that might break regex
        let code = r#"fn f() { todo!("实现这个功能 🚧") }"#;
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            !violations.is_empty(),
            "FALSIFIED: Missed todo with unicode"
        );
    }

    #[test]
    fn edge_030_todo_in_doc_test() {
        // Doc test stubs are examples, not production code
        let code = "/// ```\n/// fn example() { todo!() }\n/// ```\nfn real_fn() { 42 }";
        let violations = detect_cb050_code_stubs_in_str(code);
        assert!(
            violations.is_empty(),
            "FALSIFIED (FP): Doc test stub flagged"
        );
    }
}
