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third_party/sendspin-go/pkg/audio/output/volume_test.go

@@ -0,0 +1,70 @@
+// ABOUTME: Tests for shared volume/mute helpers in pkg/audio/output
+// ABOUTME: Covers multiplier table, half-scale, mute, and 24-bit clamping
+package output
+
+import (
+	"testing"
+
+	"github.com/Sendspin/sendspin-go/pkg/audio"
+)
+
+func TestVolumeMultiplier(t *testing.T) {
+	tests := []struct {
+		volume   int
+		muted    bool
+		expected float64
+	}{
+		{100, false, 1.0},
+		{50, false, 0.5},
+		{0, false, 0.0},
+		{80, true, 0.0}, // muted overrides volume
+	}
+
+	for _, tt := range tests {
+		result := getVolumeMultiplier(tt.volume, tt.muted)
+		if result != tt.expected {
+			t.Errorf("volume=%d muted=%v: expected %f, got %f",
+				tt.volume, tt.muted, tt.expected, result)
+		}
+	}
+}
+
+func TestApplyVolume_HalfScale(t *testing.T) {
+	samples := []int32{1000 << 8, -1000 << 8}
+
+	result := applyVolume(samples, 50, false)
+
+	if result[0] != int32(500<<8) {
+		t.Errorf("sample 0: expected %d, got %d", 500<<8, result[0])
+	}
+	if result[1] != int32(-500<<8) {
+		t.Errorf("sample 1: expected %d, got %d", -500<<8, result[1])
+	}
+}
+
+func TestApplyVolume_Muted(t *testing.T) {
+	samples := []int32{audio.Max24Bit, audio.Min24Bit, 1 << 20}
+
+	result := applyVolume(samples, 100, true)
+
+	for i, got := range result {
+		if got != 0 {
+			t.Errorf("sample %d: expected 0 when muted, got %d", i, got)
+		}
+	}
+}
+
+func TestApplyVolume_Clamps24Bit(t *testing.T) {
+	// Inputs outside the 24-bit range must clamp, not overflow.
+	overMax := int32(audio.Max24Bit + 1)
+	underMin := int32(audio.Min24Bit - 1)
+
+	result := applyVolume([]int32{overMax, underMin}, 100, false)
+
+	if result[0] != audio.Max24Bit {
+		t.Errorf("max clamp: expected %d, got %d", audio.Max24Bit, result[0])
+	}
+	if result[1] != audio.Min24Bit {
+		t.Errorf("min clamp: expected %d, got %d", audio.Min24Bit, result[1])
+	}
+}