Consolidate generated text test ownership

internal/generatedtext/day_style_test.go

@@ -119,6 +119,57 @@ func TestValidateDayStyleGeneratedTextSharedBehavior(t *testing.T) {
 	}
 }
 
+func TestDayStyleValidatorsReturnReportSpecificTypes(t *testing.T) {
+	tests := []struct {
+		name     string
+		validate func([]byte) (any, error)
+		matches  func(any) bool
+	}{
+		{
+			name: "daily",
+			validate: func(data []byte) (any, error) {
+				return ValidateDaily(data)
+			},
+			matches: func(value any) bool {
+				_, ok := value.(Daily)
+				return ok
+			},
+		},
+		{
+			name: "today",
+			validate: func(data []byte) (any, error) {
+				return ValidateToday(data)
+			},
+			matches: func(value any) bool {
+				_, ok := value.(Today)
+				return ok
+			},
+		},
+		{
+			name: "tomorrow",
+			validate: func(data []byte) (any, error) {
+				return ValidateTomorrow(data)
+			},
+			matches: func(value any) bool {
+				_, ok := value.(Tomorrow)
+				return ok
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			value, err := test.validate([]byte(`{"summary":"Summary.","forecast_discussion":["Discussion."],"precipitation_timing":""}`))
+			if err != nil {
+				t.Fatalf("validate() error = %v", err)
+			}
+			if !test.matches(value) {
+				t.Fatalf("validate() type = %T, want %s generated text", value, test.name)
+			}
+		})
+	}
+}
+
 func dayStyleFieldsForTest(t *testing.T, value any) dayStyleFields {
 	t.Helper()