// ============================================================================
// 093 — Testing String Functions
// ============================================================================
// Test string manipulation with declarative assertions.
//
// Run:   soma test 093_tests_strings.cell
// Expect: All assertions pass

cell StringUtils {
    on shout(s: String) {
        return uppercase(s)
    }

    on whisper(s: String) {
        return lowercase(s)
    }

    on greet(name: String) {
        return concat("Hello, ", concat(name, "!"))
    }

    on initials(first: String, last: String) {
        let f = substring(first, 0, 1)
        let l = substring(last, 0, 1)
        return concat(f, l)
    }
}

cell test StringTests {
    rules {
        assert shout("hello") == "HELLO"
        assert whisper("HELLO") == "hello"
        assert greet("Alice") == "Hello, Alice!"
        assert greet("World") == "Hello, World!"
        assert initials("Alice", "Smith") == "AS"
        assert initials("Bob", "Jones") == "BJ"
    }
}