diff --git a/src/test/scala/net/yoshinorin/qualtet/http/errors/ErrorsSpec.scala b/src/test/scala/net/yoshinorin/qualtet/http/errors/ErrorsSpec.scala
new file mode 100644
index 00000000..57b7a33e
--- /dev/null
+++ b/src/test/scala/net/yoshinorin/qualtet/http/errors/ErrorsSpec.scala
@@ -0,0 +1,78 @@
+package net.yoshinorin.qualtet.http.errors
+
+import org.scalatest.wordspec.AnyWordSpec
+import net.yoshinorin.qualtet.domains.errors.*
+
+class ErrorsSpec extends AnyWordSpec {
+
+  "HttpError" should {
+
+    "convert DomainError to HttpError correctly" in {
+      val authorNotFound = AuthorNotFound(detail = "Author not found")
+      assert(HttpError.fromDomainError(authorNotFound) === NotFound(detail = "Author not found"))
+
+      val articleNotFound = ArticleNotFound(detail = "Article not found")
+      assert(HttpError.fromDomainError(articleNotFound) === NotFound(detail = "Article not found"))
+
+      val contentNotFound = ContentNotFound(detail = "Content not found")
+      assert(HttpError.fromDomainError(contentNotFound) === NotFound(detail = "Content not found"))
+
+      val contentTypeNotFound = ContentTypeNotFound(detail = "Content type not found")
+      assert(HttpError.fromDomainError(contentTypeNotFound) === NotFound(detail = "Content type not found"))
+
+      val seriesNotFound = SeriesNotFound(detail = "Series not found")
+      assert(HttpError.fromDomainError(seriesNotFound) === NotFound(detail = "Series not found"))
+
+      val tagNotFound = TagNotFound(detail = "Tag not found")
+      assert(HttpError.fromDomainError(tagNotFound) === NotFound(detail = "Tag not found"))
+
+      val unauthorized = Unauthorized(detail = "Unauthorized")
+      assert(HttpError.fromDomainError(unauthorized) === net.yoshinorin.qualtet.http.errors.Unauthorized(detail = "Unauthorized"))
+
+      val invalidAuthorName = InvalidAuthorName(detail = "Invalid author name")
+      assert(HttpError.fromDomainError(invalidAuthorName) === UnprocessableEntity(detail = "Invalid author name"))
+
+      val invalidAuthorDisplayName = InvalidAuthorDisplayName(detail = "Invalid author display name")
+      assert(HttpError.fromDomainError(invalidAuthorDisplayName) === UnprocessableEntity(detail = "Invalid author display name"))
+
+      val invalidAttributes = InvalidAttributes(detail = "Invalid attributes")
+      assert(HttpError.fromDomainError(invalidAttributes) === UnprocessableEntity(detail = "Invalid attributes"))
+
+      val invalidAuthor = InvalidAuthor(detail = "Invalid author")
+      assert(HttpError.fromDomainError(invalidAuthor) === UnprocessableEntity(detail = "Invalid author"))
+
+      val invalidContentType = InvalidContentType(detail = "Invalid content type")
+      assert(HttpError.fromDomainError(invalidContentType) === UnprocessableEntity(detail = "Invalid content type"))
+
+      val invalidExternalResourceKind = InvalidExternalResourceKind(detail = "Invalid external resource kind")
+      assert(HttpError.fromDomainError(invalidExternalResourceKind) === UnprocessableEntity(detail = "Invalid external resource kind"))
+
+      val invalidSearchConditions = InvalidSearchConditions(detail = "Invalid search conditions")
+      assert(HttpError.fromDomainError(invalidSearchConditions) === UnprocessableEntity(detail = "Invalid search conditions"))
+
+      val invalidSeries = InvalidSeries(detail = "Invalid series")
+      assert(HttpError.fromDomainError(invalidSeries) === UnprocessableEntity(detail = "Invalid series"))
+
+      val contentTitleRequired = ContentTitleRequired(detail = "Content title required")
+      assert(HttpError.fromDomainError(contentTitleRequired) === BadRequest(detail = "Content title required"))
+
+      val rawContentRequired = RawContentRequired(detail = "Raw content required")
+      assert(HttpError.fromDomainError(rawContentRequired) === BadRequest(detail = "Raw content required"))
+
+      val htmlContentRequired = HtmlContentRequired(detail = "HTML content required")
+      assert(HttpError.fromDomainError(htmlContentRequired) === BadRequest(detail = "HTML content required"))
+
+      val seriesNameRequired = SeriesNameRequired(detail = "Series name required")
+      assert(HttpError.fromDomainError(seriesNameRequired) === BadRequest(detail = "Series name required"))
+
+      val seriesTitleRequired = SeriesTitleRequired(detail = "Series title required")
+      assert(HttpError.fromDomainError(seriesTitleRequired) === BadRequest(detail = "Series title required"))
+
+      val unexpectedJsonFormat = UnexpectedJsonFormat(detail = "Unexpected JSON format")
+      assert(HttpError.fromDomainError(unexpectedJsonFormat) === BadRequest(detail = "Unexpected JSON format"))
+
+      val unexpectedException = UnexpectedException(detail = "Unexpected exception")
+      assert(HttpError.fromDomainError(unexpectedException) === InternalServerError(detail = "Unexpected exception"))
+    }
+  }
+}