Add data package export regression coverage

internal/briefing/modules_test.go

@@ -59,6 +59,43 @@ func TestDefaultReportModulesBuildSnapshots(t *testing.T) {
 	}
 }
 
+func TestDefaultModuleDefinitionsDeclarePromptExportPolicy(t *testing.T) {
+	customExporters := map[module.ID]struct{}{
+		module.CurrentConditions:       {},
+		module.HourlyForecast:          {},
+		module.DerivedDaypartSummaries: {},
+	}
+	passThroughExporters := map[module.ID]struct{}{
+		module.Metadata:                {},
+		module.NarrativeForecast:       {},
+		module.DerivedDailySummary:     {},
+		module.PrecipTiming:            {},
+		module.AlertDigest:             {},
+		module.SPCConvectiveOutlooks:   {},
+		module.AreaForecastDiscussion:  {},
+		module.SPCConvectiveDiscussion: {},
+		module.WeatherStory:            {},
+		module.OutdoorWindows:          {},
+		module.TodayPlanning:           {},
+		module.TomorrowPlanning:        {},
+		module.DailyPlanning:           {},
+	}
+
+	for _, definition := range defaultModuleDefinitions() {
+		_, custom := customExporters[definition.ID]
+		_, passThrough := passThroughExporters[definition.ID]
+		if custom == passThrough {
+			t.Fatalf("module %q exporter policy custom=%v passThrough=%v, want exactly one policy", definition.ID, custom, passThrough)
+		}
+		if custom && definition.PromptExporter == nil {
+			t.Fatalf("module %q PromptExporter = nil, want custom prompt exporter", definition.ID)
+		}
+		if passThrough && definition.PromptExporter != nil {
+			t.Fatalf("module %q PromptExporter is set, want default pass-through", definition.ID)
+		}
+	}
+}
+
 func TestModuleRegistryAddsPassThroughPromptValue(t *testing.T) {
 	registry, err := NewModuleRegistry([]ModuleDefinition{
 		{