test(02-01): add failing tests for synth config, oscillator, and layer

- TestAllClassesHaveConfig, TestFrequenciesInRange, TestFrequenciesUnique
- TestHarmonicsNonEmpty, TestPanPositionsInRange
- TestOscillatorAdvance, TestOscillatorPhaseWrap, TestOscillatorDistinctFreqs
- TestEMAAmplitudeRise, TestEMAAmplitudeDecay, TestWhisperFloor, TestWhisperFloorNotSeenIsZero

synth/config_test.go

@@ -0,0 +1,50 @@
+package synth_test
+
+import (
+	"testing"
+
+	"github.com/netsynth/netsynth/classify"
+	"github.com/netsynth/netsynth/synth"
+)
+
+func TestAllClassesHaveConfig(t *testing.T) {
+	for _, class := range classify.AllClasses() {
+		if _, ok := synth.ClassFreqConfigs[class]; !ok {
+			t.Errorf("class %q has no entry in ClassFreqConfigs", class)
+		}
+	}
+}
+
+func TestFrequenciesInRange(t *testing.T) {
+	for class, cfg := range synth.ClassFreqConfigs {
+		if cfg.BaseHz < 60 || cfg.BaseHz > 800 {
+			t.Errorf("class %q BaseHz=%.1f is out of range [60, 800]", class, cfg.BaseHz)
+		}
+	}
+}
+
+func TestFrequenciesUnique(t *testing.T) {
+	seen := make(map[float64]classify.TrafficClass)
+	for class, cfg := range synth.ClassFreqConfigs {
+		if prev, exists := seen[cfg.BaseHz]; exists {
+			t.Errorf("classes %q and %q share the same BaseHz=%.1f", prev, class, cfg.BaseHz)
+		}
+		seen[cfg.BaseHz] = class
+	}
+}
+
+func TestHarmonicsNonEmpty(t *testing.T) {
+	for class, cfg := range synth.ClassFreqConfigs {
+		if len(cfg.Harmonics) < 2 {
+			t.Errorf("class %q has fewer than 2 harmonics (got %d)", class, len(cfg.Harmonics))
+		}
+	}
+}
+
+func TestPanPositionsInRange(t *testing.T) {
+	for class, cfg := range synth.ClassFreqConfigs {
+		if cfg.Pan < -1.0 || cfg.Pan > 1.0 {
+			t.Errorf("class %q Pan=%.2f is out of range [-1.0, 1.0]", class, cfg.Pan)
+		}
+	}
+}