fix

config/config.go

@@ -2,13 +2,15 @@ package config
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"os"
 	"path/filepath"
 	"strings"
 	"text/template"
 
+	"github.com/go-playground/validator/v10"
 	"github.com/mitchellh/mapstructure"
 	"github.com/spf13/viper"
 )
@@ -181,8 +183,7 @@ func evaluateConfigWithEnv(configFile io.Reader, writers ...io.Writer) (io.Reade
 		return nil, fmt.Errorf("unable to read the config file: %w", err)
 	}
 
-	// t := template.New("appConfigTemplate").Option("missingkey=zero")
-	t := template.New("appConfigTemplate")
+	t := template.New("appConfigTemplate").Option("missingkey=zero")
 	tmpl, err := t.Parse(string(b))
 	if err != nil {
 		return nil, fmt.Errorf("unable to parse template from: \n%s: %w", string(b), err)
@@ -205,3 +206,17 @@ func getAppEnv() string {
 	}
 	return env
 }
+
+func validateConfiguration[T any](cfg *T) error {
+	validate := validator.New()
+	err := validate.Struct(*cfg)
+	fmt.Println("...validateConfiguration, cfg:", cfg)
+	fmt.Println("...validateConfiguration, err:", err)
+	if err != nil {
+		errSlice := &validator.ValidationErrors{}
+		errors.As(err, errSlice)
+		return errSlice
+	}
+
+	return nil
+}

config/config_test.go

@@ -38,7 +38,6 @@ blah2=test2`
 	b, err := io.ReadAll(eval)
 	r.NoError(err)
 	r.Equal(expected, string(b))
-	r.Equal(true, false)
 }
 
 func TesEvaluateConfigWithMissingEnv(t *testing.T) {