Add package: fortune

Author: hioki-daichi

kadai4/hioki-daichi/fortune/fortune.go

@@ -0,0 +1,45 @@
+/*
+Package fortune is a package that manages processing around fortune.
+*/
+package fortune
+
+import (
+	"math/rand"
+)
+
+// Fortune means 運勢
+type Fortune string
+
+const (
+	// Daikichi means "大吉"
+	Daikichi Fortune = "大吉"
+
+	// Chukichi means "中吉"
+	Chukichi Fortune = "中吉"
+
+	// Shokichi means "小吉"
+	Shokichi Fortune = "小吉"
+
+	// Kichi means "吉"
+	Kichi Fortune = "吉"
+
+	// Suekichi means "末吉"
+	Suekichi Fortune = "末吉"
+
+	// Kyo means "凶"
+	Kyo Fortune = "凶"
+
+	// Daikyo means "大凶"
+	Daikyo Fortune = "大凶"
+)
+
+// DrawFortune draws a fortune.
+func DrawFortune() Fortune {
+	fs := AllFortunes()
+	return fs[rand.Intn(len(fs))]
+}
+
+// AllFortunes returns all fortunes.
+func AllFortunes() []Fortune {
+	return []Fortune{Daikichi, Chukichi, Shokichi, Kichi, Suekichi, Kyo, Daikyo}
+}

kadai4/hioki-daichi/fortune/fortune_test.go

@@ -0,0 +1,34 @@
+package fortune
+
+import (
+	"math/rand"
+	"testing"
+)
+
+func TestFortune_DrawFortune(t *testing.T) {
+	cases := map[string]struct {
+		seed     int64
+		expected Fortune
+	}{
+		"KYOU":     {seed: 0, expected: Kyo},
+		"DAIKYOU":  {seed: 1, expected: Daikyo},
+		"SUEKICHI": {seed: 2, expected: Suekichi},
+		"KICHI":    {seed: 3, expected: Kichi},
+		"CHUKICHI": {seed: 4, expected: Chukichi},
+		"SHOKICHI": {seed: 5, expected: Shokichi},
+		"DAICHIKI": {seed: 9, expected: Daikichi},
+	}
+
+	for n, c := range cases {
+		c := c
+		t.Run(n, func(t *testing.T) {
+			rand.Seed(c.seed)
+
+			expected := c.expected
+			actual := DrawFortune()
+			if actual != expected {
+				t.Errorf(`unexpected response body: expected: "%s" actual: "%s"`, expected, actual)
+			}
+		})
+	}
+}