feat(config): support multi-service yaml config

adapter/config_test.go

@@ -0,0 +1,48 @@
+package adapter
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestConfigRequiredReturnsConfiguredValue(t *testing.T) {
+	cfg := Config{"url": "redis://127.0.0.1:6379"}
+
+	got, err := cfg.Required("url")
+	if err != nil {
+		t.Fatalf("Required returned error: %v", err)
+	}
+	if got != "redis://127.0.0.1:6379" {
+		t.Fatalf("Required() = %q, want configured value", got)
+	}
+}
+
+func TestConfigRequiredReportsMissingName(t *testing.T) {
+	cfg := Config{}
+
+	_, err := cfg.Required("url")
+	if err == nil {
+		t.Fatal("Required returned nil error")
+	}
+	if !strings.Contains(err.Error(), "url") {
+		t.Fatalf("error %q does not include config key", err)
+	}
+}
+
+func TestConfigOptionalReturnsConfiguredValue(t *testing.T) {
+	cfg := Config{"counter_key": "custom"}
+
+	got := cfg.Optional("counter_key", "counter")
+	if got != "custom" {
+		t.Fatalf("Optional() = %q, want custom", got)
+	}
+}
+
+func TestConfigOptionalUsesDefault(t *testing.T) {
+	cfg := Config{}
+
+	got := cfg.Optional("counter_key", "counter")
+	if got != "counter" {
+		t.Fatalf("Optional() = %q, want counter", got)
+	}
+}