add basic nats server module

internal/module/test/nats-server_test.go

@@ -0,0 +1,85 @@
+package module_test
+
+import (
+	"testing"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"github.com/jwetzell/showbridge-go/internal/module"
+)
+
+func TestNATSServerFromRegistry(t *testing.T) {
+	registration, ok := module.ModuleRegistry["nats.server"]
+	if !ok {
+		t.Fatalf("nats.server module not registered")
+	}
+
+	moduleInstance, err := registration.New(config.ModuleConfig{
+		Id:   "test",
+		Type: "nats.server",
+		Params: map[string]any{
+			"ip":   "127.0.0.1",
+			"port": 4222,
+		},
+	})
+
+	if err != nil {
+		t.Fatalf("failed to create nats.server module: %s", err)
+	}
+
+	if moduleInstance.Id() != "test" {
+		t.Fatalf("nats.server module has wrong id: %s", moduleInstance.Id())
+	}
+
+	if moduleInstance.Type() != "nats.server" {
+		t.Fatalf("nats.server module has wrong type: %s", moduleInstance.Type())
+	}
+}
+
+func TestBadNATSServer(t *testing.T) {
+	tests := []struct {
+		name        string
+		params      map[string]any
+		errorString string
+	}{
+		{
+			name: "non-string ip",
+			params: map[string]any{
+				"ip": 123,
+			},
+			errorString: "nats.server ip must be a string",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+
+			registration, ok := module.ModuleRegistry["nats.server"]
+			if !ok {
+				t.Fatalf("nats.server module not registered")
+			}
+
+			moduleInstance, err := registration.New(config.ModuleConfig{
+				Id:     "test",
+				Type:   "nats.server",
+				Params: test.params,
+			})
+
+			if err != nil {
+				if test.errorString != err.Error() {
+					t.Fatalf("nats.server got error '%s', expected '%s'", err.Error(), test.errorString)
+				}
+				return
+			}
+
+			err = moduleInstance.Start(t.Context())
+
+			if err == nil {
+				t.Fatalf("nats.server expected to fail")
+			}
+
+			if err.Error() != test.errorString {
+				t.Fatalf("nats.server got error '%s', expected '%s'", err.Error(), test.errorString)
+			}
+		})
+	}
+}