chore: add test case for #112

Signed-off-by: Sebastian Hoß <seb@xn--ho-hia.de>

Author: sebhoss

internal/provider/provider_test.go

@@ -4,3 +4,48 @@
  */
 
 package provider_test
+
+import (
+	"bufio"
+	"os"
+	"regexp"
+	"strings"
+	"testing"
+)
+
+func TestProviderDocumentation(t *testing.T) {
+	file, err := os.Open("../../docs/data-sources/external_secrets_io_cluster_secret_store_v1alpha1_manifest.md")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer file.Close()
+
+	linkPattern := regexp.MustCompile(`<a id="nestedatt--(?P<DashedPath>.*)"></a>`)
+	titlePattern := regexp.MustCompile("### Nested Schema for `(?P<DottedPath>.*)`")
+	expectedTitle := ""
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		link := linkPattern.FindStringSubmatch(line)
+		title := titlePattern.FindStringSubmatch(line)
+
+		if len(link) > 0 {
+			attributeIndex := linkPattern.SubexpIndex("DashedPath")
+			attributeValue := link[attributeIndex]
+			expectedTitle = strings.ReplaceAll(attributeValue, "--", ".")
+		}
+		if len(title) > 0 {
+			pathIndex := titlePattern.SubexpIndex("DottedPath")
+			pathValue := title[pathIndex]
+			if expectedTitle != pathValue {
+				t.Errorf("Wanted [%s] but got [%s]", expectedTitle, pathValue)
+			}
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		t.Fatal(err)
+	}
+}