Add volume changing logic

internal/mixer/mixer_test.go

@@ -0,0 +1,34 @@
+package mixer_test
+
+import (
+	"math"
+	"testing"
+
+	"rhemawavetech.com/rhemawave/internal/mixer"
+)
+
+func TestConvertVolume(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    int
+		expected float64
+	}{
+		{"0 percent", 0, 0.0},
+		{"25 percent", 25, 0.25},
+		{"33 percent", 33, 0.33},
+		{"50 percent", 50, 0.50},
+		{"90 percent", 90, 0.90},
+		{"100 percent", 100, 1.0},
+	}
+
+	const epsilon = 1e-9
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := mixer.ConvertVolume(tt.input)
+			if math.Abs(got-tt.expected) > epsilon {
+				t.Errorf("ConvertVolume(%d) = %v, want %v", tt.input, got, tt.expected)
+			}
+		})
+	}
+}