diff --git a/cmd/qrank-builder/build.go b/cmd/qrank-builder/build.go
new file mode 100644
index 0000000..4fb2497
--- /dev/null
+++ b/cmd/qrank-builder/build.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+	"context"
+)
+
+// Build runs the entire QRank pipeline.
+func Build(dumps string, numWeeks int, s3 S3) error {
+	ctx := context.Background()
+
+	pageviews, err := buildPageviews(ctx, dumps, numWeeks, s3)
+	if err != nil {
+		return err
+	}
+
+	sites, err := ReadWikiSites(dumps)
+	if err != nil {
+		return err
+	}
+	logger.Printf("found wikimedia dumps for %d sites", len(*sites))
+
+	if err := buildPageSignals(ctx, dumps, sites, s3); err != nil {
+		return err
+	}
+
+	_, err = buildItemSignals(ctx, pageviews, sites, s3)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/cmd/qrank-builder/build_test.go b/cmd/qrank-builder/build_test.go
new file mode 100644
index 0000000..e57343d
--- /dev/null
+++ b/cmd/qrank-builder/build_test.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"bytes"
+	"log"
+	"path/filepath"
+	"slices"
+	"testing"
+)
+
+// TestBuild is a large integration test that runs the entire pipeline.
+func TestBuild(t *testing.T) {
+	if testing.Short() {
+		t.Skip()
+	}
+
+	logger = log.New(&bytes.Buffer{}, "", log.Lshortfile)
+	dumps := filepath.Join("testdata", "dumps")
+	s3 := NewFakeS3()
+	if err := Build(dumps /*numWeeks*/, 1, s3); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := s3.ReadLines("public/item_signals-20240501.csv.zst")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	want := []string{
+		"item,pageviews_52w,wikitext_bytes,claims,identifiers,sitelinks",
+		"Q72,0,3142,550,85,186",
+		"Q5296,0,2872,0,0,0",
+		"Q662541,3,4973,32,9,15",
+		"Q5649951,0,0,1,0,20",
+		"Q107661323,0,3470,0,0,0",
+	}
+
+	if !slices.Equal(got, want) {
+		t.Errorf("got %v, want %v", got, want)
+	}
+}
diff --git a/cmd/qrank-builder/main.go b/cmd/qrank-builder/main.go
index 058395f..fb908b6 100644
--- a/cmd/qrank-builder/main.go
+++ b/cmd/qrank-builder/main.go
@@ -99,37 +99,11 @@ func NewStorageClient(keypath string) (*minio.Client, error) {
 }
 
 func computeQRank(dumpsPath string, testRun bool, storage *minio.Client) error {
-	ctx := context.Background()
-	var s3 S3 = storage
-
-	// Build pageviews files. We're changing how pageviews get aggregated,
-	// and this is the new, vastly more efficient approach. But it is not
-	// fully implemented yet, so we do not yet actually use the output.
-	// The older approach is done by the call to processPageviews below.
-	// https://github.com/brawer/wikidata-qrank/issues/23
-	numWeeks := 52
-	pageviews, err := buildPageviews(ctx, dumpsPath, numWeeks, s3)
-	if err != nil {
-		return err
-	}
-
-	sites, err := ReadWikiSites(dumpsPath)
-	if err != nil {
-		return err
-	}
-	logger.Printf("found wikimedia dumps for %d sites", len(*sites))
-	if err := buildPageSignals(ctx, dumpsPath, sites, s3); err != nil {
-		return err
-	}
-
-	_, err = buildItemSignals(ctx, pageviews, sites, s3)
-	if err != nil {
-		return err
-	}
+	return Build(dumpsPath /*numWeeks*/, 52, storage)
 
 	// TODO: Old code starts here, remove after new implementation is done.
-	return nil
 
+	ctx := context.Background()
 	outDir := "cache"
 	if testRun {
 		outDir = "cache-testrun"
@@ -148,7 +122,7 @@ func computeQRank(dumpsPath string, testRun bool, storage *minio.Client) error {
 		return err
 	}
 
-	pageviews, err = processPageviews(testRun, dumpsPath, edate, outDir, ctx)
+	pageviews, err := processPageviews(testRun, dumpsPath, edate, outDir, ctx)
 	if err != nil {
 		return err
 	}