Replace shell script with go tests (#153)

This change replaces `examples/validate-configs.sh` with go tests,
which guarantees their execution in CI.

Author: blkt

examples/README.md

@@ -451,9 +451,6 @@ thv-registry-api serve \
 ## Command Reference
 
 ```bash
-# Validate configs before using
-./examples/validate-configs.sh
-
 # Start with Git sync
 thv-registry-api serve --config examples/config-git.yaml
 

examples/configs_test.go

@@ -0,0 +1,76 @@
+package examples
+
+import (
+	"embed"
+	"io/fs"
+	"path/filepath"
+	"testing"
+
+	"gopkg.in/yaml.v3"
+)
+
+//go:embed config-*.yaml
+var configFS embed.FS
+
+func TestConfigFiles(t *testing.T) {
+	t.Parallel()
+
+	// Find all config-*.yaml files in the embedded filesystem
+	matches, err := fs.Glob(configFS, "config-*.yaml")
+	if err != nil {
+		t.Fatalf("Failed to find config files: %v", err)
+	}
+
+	if len(matches) == 0 {
+		t.Fatal("No config-*.yaml files found")
+	}
+
+	for _, configPath := range matches {
+		t.Run(filepath.Base(configPath), func(t *testing.T) {
+			t.Parallel()
+
+			// Read the file from embedded filesystem
+			data, err := configFS.ReadFile(configPath)
+			if err != nil {
+				t.Fatalf("Failed to read file: %v", err)
+			}
+
+			// Validate YAML syntax
+			var config map[string]any
+			if err := yaml.Unmarshal(data, &config); err != nil {
+				t.Fatalf("Invalid YAML syntax: %v", err)
+			}
+
+			// Check required fields
+			if _, ok := config["source"]; !ok {
+				t.Fatal("Missing required field: source")
+			}
+
+			source, ok := config["source"].(map[string]any)
+			if !ok {
+				t.Fatal("source must be a map")
+			}
+
+			if _, ok := source["type"]; !ok {
+				t.Fatal("Missing required field: source.type")
+			}
+
+			if _, ok := source["format"]; !ok {
+				t.Fatal("Missing required field: source.format")
+			}
+
+			if _, ok := config["syncPolicy"]; !ok {
+				t.Fatal("Missing required field: syncPolicy")
+			}
+
+			syncPolicy, ok := config["syncPolicy"].(map[string]any)
+			if !ok {
+				t.Fatal("syncPolicy must be a map")
+			}
+
+			if _, ok := syncPolicy["interval"]; !ok {
+				t.Fatal("Missing required field: syncPolicy.interval")
+			}
+		})
+	}
+}