Bugfixes and improved alignment with architecture blueprint

internal/artifact/reader_test.go

@@ -2,6 +2,7 @@ package artifact
 
 import (
 	"context"
+	"errors"
 	"os"
 	"testing"
 
@@ -24,8 +25,11 @@ func TestCompositeReader_Read(t *testing.T) {
 		if string(art.Body) != "hello world" {
 			t.Errorf("expected 'hello world', got %s", string(art.Body))
 		}
-		if art.Hash == "" {
-			t.Error("expected hash to be computed")
+		if art.ContentType != "text/plain" {
+			t.Errorf("expected text/plain content type, got %q", art.ContentType)
+		}
+		if art.Hash != "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9" {
+			t.Errorf("unexpected hash: %s", art.Hash)
 		}
 	})
 
@@ -35,7 +39,7 @@ func TestCompositeReader_Read(t *testing.T) {
 			Body: "",
 		}
 		_, err := reader.Read(ctx, ref)
-		if err == nil || err != ErrMissingInlineBody {
+		if !errors.Is(err, ErrMissingInlineBody) {
 			t.Errorf("expected ErrMissingInlineBody, got %v", err)
 		}
 	})
@@ -46,7 +50,7 @@ func TestCompositeReader_Read(t *testing.T) {
 			URI:  "s3://bucket/key",
 		}
 		_, err := reader.Read(ctx, ref)
-		if err == nil {
+		if !errors.Is(err, ErrUnsupportedRefType) {
 			t.Error("expected error for unsupported type")
 		}
 	})
@@ -83,8 +87,8 @@ func TestFileReader_Read(t *testing.T) {
 		if art.Name == "" {
 			t.Error("expected name to be inferred from filename")
 		}
-		if art.Hash == "" {
-			t.Error("expected hash to be computed")
+		if art.Hash != "60f5237ed4049f0382661ef009d2bc42e48c3ceb3edb6600f7024e7ab3b838f3" {
+			t.Errorf("unexpected hash: %s", art.Hash)
 		}
 	})
 
@@ -94,7 +98,7 @@ func TestFileReader_Read(t *testing.T) {
 			URI:  "",
 		}
 		_, err := reader.Read(ctx, ref)
-		if err == nil || err != ErrMissingFilePath {
+		if !errors.Is(err, ErrMissingFilePath) {
 			t.Errorf("expected ErrMissingFilePath, got %v", err)
 		}
 	})