chore: establish local platform baseline

internal/ratelimit/limiter_test.go

@@ -0,0 +1,26 @@
+package ratelimit
+
+import "testing"
+
+func TestIdentifierHashDoesNotExposeIdentifier(t *testing.T) {
+	identifier := "192.0.2.10"
+	first := IdentifierHash(identifier)
+	if len(first) != 32 || first == identifier || first != IdentifierHash(identifier) {
+		t.Fatalf("unexpected identifier hash: %s", first)
+	}
+	if first == IdentifierHash("192.0.2.11") {
+		t.Fatal("different identifiers should not share a hash")
+	}
+}
+
+func TestNewRejectsInvalidPolicy(t *testing.T) {
+	if _, err := New(nil, "", Policy{}); err == nil {
+		t.Fatal("invalid limiter configuration should fail")
+	}
+}
+
+func TestNewPoliciesRejectsInvalidScopedPolicy(t *testing.T) {
+	if _, err := NewPolicies(nil, "prefix", map[string]Policy{"device": {RatePerSecond: 1, Burst: 1}}); err == nil {
+		t.Fatal("nil Redis client should fail")
+	}
+}