coding-practice/problems/3227-vowels-game-in-a-string/test/main_test.go

// LeetCode 3227: Vowels Game in a String 單元測試（Go testing）
// Problem: Alice and Bob play a game. Alice removes substrings with odd vowels, 
// Bob removes substrings with even vowels. Alice wins if string has any vowels.
package vowels_test

import (
    "fmt"
    "testing"
    vowels "leetcode/3227-vowels-game-in-a-string/go"
)

func TestExample1(t *testing.T) {
    // "leetcode" contains vowels: e,e,o,e
    input := "leetcode"
    got := vowels.DoesAliceWin(input)
    want := true // Alice wins
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestExample2(t *testing.T) {
    // "bcdf" has no vowels
    input := "bcdf"
    got := vowels.DoesAliceWin(input)
    want := false // Bob wins (Alice can't make first move)
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestAllVowels(t *testing.T) {
    // All vowels string - Alice removes entire string
    input := "aeiou"
    got := vowels.DoesAliceWin(input)
    want := true
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestSingleVowel(t *testing.T) {
    // Single vowel - Alice removes it immediately
    input := "a"
    got := vowels.DoesAliceWin(input)
    want := true
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestSingleConsonant(t *testing.T) {
    // Single consonant - Alice can't move
    input := "b"
    got := vowels.DoesAliceWin(input)
    want := false
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestMixedString(t *testing.T) {
    // "programming" has vowels: o,a,i
    input := "programming"
    got := vowels.DoesAliceWin(input)
    want := true // Alice can remove vowels
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestLongStringNoVowels(t *testing.T) {
    // All consonants - no vowels means Bob wins
    input := "bcdfghjklmnpqrstvwxyz"
    got := vowels.DoesAliceWin(input)
    want := false
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestRepeatedVowels(t *testing.T) {
    // Even number of same vowels - Alice can leave 1 for Bob
    input := "aaaa"
    got := vowels.DoesAliceWin(input)
    want := true
    if got != want {
        t.Fatalf("input %q: want %v got %v", input, want, got)
    }
}

func TestEdgeCases(t *testing.T) {
    testCases := []struct {
        input string
        want  bool
        desc  string
    }{
        {"e", true, "single vowel"},
        {"x", false, "single consonant"},
        {"ab", true, "has vowel 'a'"},
        {"xy", false, "no vowels"},
        {"xabc", true, "vowel in middle"},
        {"abcx", true, "vowel at start"},
        {"xbca", true, "vowel at end"},
    }

    for _, tc := range testCases {
        t.Run(tc.desc, func(t *testing.T) {
            got := vowels.DoesAliceWin(tc.input)
            if got != tc.want {
                t.Fatalf("input %q (%s): want %v got %v", tc.input, tc.desc, tc.want, got)
            }
        })
    }
}

func TestGameTheoryValidation(t *testing.T) {
    testCases := []struct {
        input string
        want  bool
        desc  string
    }{
        // If total vowels = 0: Alice loses
        {"bcdfg", false, "no vowels - Alice can't move"},
        {"rhythm", false, "no vowels (y not counted)"},
        
        // Any vowels > 0: Alice wins
        {"hello", true, "e,o vowels - Alice wins"},
        {"beautiful", true, "e,a,u,i,u vowels - Alice wins"},
        {"code", true, "o,e vowels - Alice wins"},
        {"education", true, "e,u,a,i,o vowels - Alice wins"},
        {"queue", true, "u,e,u,e vowels - Alice wins"},
    }

    for _, tc := range testCases {
        t.Run(tc.desc, func(t *testing.T) {
            got := vowels.DoesAliceWin(tc.input)
            if got != tc.want {
                t.Fatalf("input %q (%s): want %v got %v", tc.input, tc.desc, tc.want, got)
            }
        })
    }
}

func TestParameterized(t *testing.T) {
    testCases := []struct {
        input string
        want  bool
    }{
        {"", false},        // empty string
        {"aeiou", true},    // all vowels
        {"bcdfg", false},   // all consonants
        {"hello", true},    // mixed with vowels
        {"rhythm", false},  // no vowels
        {"queue", true},    // multiple same vowels
        {"xyz", false},     // short no vowels
        {"programming", true}, // longer mixed
    }

    for _, tc := range testCases {
        t.Run(tc.input, func(t *testing.T) {
            got := vowels.DoesAliceWin(tc.input)
            if got != tc.want {
                t.Errorf("doesAliceWin(%q) = %v, want %v", tc.input, got, tc.want)
            }
        })
    }
}

// Benchmark test
func BenchmarkDoesAliceWin(b *testing.B) {
    testString := "abcdefghijklmnopqrstuvwxyz"
    b.ResetTimer()
    for i := 0; i < b.N; i++ {
        vowels.DoesAliceWin(testString)
    }
}

// Example test for documentation
func ExampleDoesAliceWin() {
    result1 := vowels.DoesAliceWin("leetcode")
    result2 := vowels.DoesAliceWin("bcdf")
    fmt.Println(result1)
    fmt.Println(result2)
    // Output:
    // true
    // false
}