diff --git a/build/builder.go b/build/builder.go
index dfbfcf7f..4f8824e1 100644
--- a/build/builder.go
+++ b/build/builder.go
@@ -37,7 +37,7 @@ import (
 	"time"
 
 	"github.com/bmatcuk/doublestar"
-	"github.com/grafana/regexp"
+	"github.com/go-enry/go-enry/v2"
 	"github.com/rs/xid"
 
 	"github.com/sourcegraph/zoekt"
@@ -901,18 +901,8 @@ func squashRange(j int) float64 {
 //
 // These 'priority' criteria affects how documents are ordered within a shard. It's
 // also used to help guess a file's rank when we're missing ranking information.
-func IsLowPriority(file string) bool {
-	return testRe.MatchString(file) || isGenerated(file) || isVendored(file)
-}
-
-var testRe = regexp.MustCompile("[Tt]est")
-
-func isGenerated(file string) bool {
-	return strings.HasSuffix(file, "min.js") || strings.HasSuffix(file, "js.map")
-}
-
-func isVendored(file string) bool {
-	return strings.Contains(file, "vendor/") || strings.Contains(file, "node_modules/")
+func IsLowPriority(path string, content []byte) bool {
+	return enry.IsTest(path) || enry.IsVendor(path) || enry.IsGenerated(path, content)
 }
 
 type rankedDoc struct {
@@ -931,17 +921,17 @@ func rank(d *zoekt.Document, origIdx int) []float64 {
 	}
 
 	generated := 0.0
-	if isGenerated(d.Name) {
+	if enry.IsGenerated(d.Name, d.Content) {
 		generated = 1.0
 	}
 
 	vendor := 0.0
-	if isVendored(d.Name) {
+	if enry.IsVendor(d.Name) {
 		vendor = 1.0
 	}
 
 	test := 0.0
-	if testRe.MatchString(d.Name) {
+	if enry.IsTest(d.Name) {
 		test = 1.0
 	}
 
diff --git a/build/builder_test.go b/build/builder_test.go
index e5f4742d..aec77a4e 100644
--- a/build/builder_test.go
+++ b/build/builder_test.go
@@ -764,8 +764,7 @@ func TestFindRepositoryMetadata(t *testing.T) {
 func TestIsLowPriority(t *testing.T) {
 	cases := []string{
 		"builder_test.go",
-		"TestQuery.java",
-		"test/mocks.go",
+		"test/TestQuery.java",
 		"search/vendor/thirdparty.cc",
 		"search/node_modules/search/index.js",
 		"search.min.js",
@@ -774,7 +773,7 @@ func TestIsLowPriority(t *testing.T) {
 
 	for _, tt := range cases {
 		t.Run(tt, func(t *testing.T) {
-			if !IsLowPriority(tt) {
+			if !IsLowPriority(tt, nil) {
 				t.Errorf("expected file '%s' to be low priority", tt)
 			}
 		})
@@ -788,11 +787,22 @@ func TestIsLowPriority(t *testing.T) {
 
 	for _, tt := range negativeCases {
 		t.Run(tt, func(t *testing.T) {
-			if IsLowPriority(tt) {
+			if IsLowPriority(tt, nil) {
 				t.Errorf("did not expect file '%s' to be low priority", tt)
 			}
 		})
 	}
+
+	// Explicitly check that content is important by using the same filename but
+	// different content.
+	normal := "package mock\n\nvar Mock struct {}"
+	generated := "// Code generated by mock\npackage mock\n\nvar Mock struct {}"
+	if IsLowPriority("mock.go", []byte(normal)) {
+		t.Error("expected non-generated content to not be low priority")
+	}
+	if !IsLowPriority("mock.go", []byte(generated)) {
+		t.Error("expected generated content to be low priority")
+	}
 }
 
 func createTestShard(t *testing.T, indexDir string, r zoekt.Repository, numShards int, optFns ...func(options *Options)) []string {
diff --git a/build/e2e_test.go b/build/e2e_test.go
index f66b64b9..1eb5acff 100644
--- a/build/e2e_test.go
+++ b/build/e2e_test.go
@@ -502,7 +502,7 @@ func TestFileRank(t *testing.T) {
 		name: "test",
 		docs: []*zoekt.Document{
 			{
-				Name:    "test",
+				Name:    "foo_test.go",
 				Content: []byte("bla"),
 			},
 			{
diff --git a/gitindex/index.go b/gitindex/index.go
index 92cf3686..ddf73e0d 100644
--- a/gitindex/index.go
+++ b/gitindex/index.go
@@ -589,10 +589,10 @@ type repoPathRanks struct {
 //   - If we have a concrete rank for this file, always use it
 //   - If there's no rank, and it's a low priority file like a test, then use rank 0
 //   - Otherwise use the mean rank of this repository, to avoid giving it a big disadvantage
-func (r repoPathRanks) rank(path string) float64 {
+func (r repoPathRanks) rank(path string, content []byte) float64 {
 	if rank, ok := r.Paths[path]; ok {
 		return rank
-	} else if build.IsLowPriority(path) {
+	} else if build.IsLowPriority(path, content) {
 		return 0.0
 	} else {
 		return r.MeanRank
@@ -910,7 +910,7 @@ func createDocument(key fileKey,
 	var pathRanks []float64
 	if len(ranks.Paths) > 0 {
 		// If the repository has ranking data, then store the file's rank.
-		pathRank := ranks.rank(keyFullPath)
+		pathRank := ranks.rank(keyFullPath, contents)
 		pathRanks = []float64{pathRank}
 	}
 
diff --git a/gitindex/index_test.go b/gitindex/index_test.go
index 63f5899a..0aca0414 100644
--- a/gitindex/index_test.go
+++ b/gitindex/index_test.go
@@ -744,7 +744,7 @@ func TestRepoPathRanks(t *testing.T) {
 
 	for _, tt := range cases {
 		t.Run(tt.name, func(t *testing.T) {
-			got := pathRanks.rank(tt.path)
+			got := pathRanks.rank(tt.path, nil)
 			if got != tt.rank {
 				t.Errorf("expected file '%s' to have rank %f, but got %f", tt.path, tt.rank, got)
 			}
diff --git a/internal/e2e/testdata/coverage_data_writer.txt b/internal/e2e/testdata/coverage_data_writer.txt
index 06abe41e..ce4b3b8d 100644
--- a/internal/e2e/testdata/coverage_data_writer.txt
+++ b/internal/e2e/testdata/coverage_data_writer.txt
@@ -14,6 +14,12 @@ github.com/golang/go/src/cmd/cover/func.go
 32:// as output the coverage data broken down by function, like this:
 hidden 8 more line matches
 
+github.com/golang/go/src/testing/fuzz.go
+93:	Data       []byte
+205:// modify the underlying data of the arguments provided by the fuzzing engine.
+275:	run := func(captureOut io.Writer, e corpusEntry) (ok bool) {
+hidden 7 more line matches
+
 github.com/golang/go/src/cmd/cover/html.go
 199:	Coverage float64
 170:type templateData struct {
@@ -26,12 +32,6 @@ github.com/golang/go/src/internal/fuzz/fuzz.go
 908:func (c *coordinator) updateCoverage(newCoverage []byte) int {
 hidden 91 more line matches
 
-github.com/golang/go/src/testing/fuzz.go
-93:	Data       []byte
-205:// modify the underlying data of the arguments provided by the fuzzing engine.
-275:	run := func(captureOut io.Writer, e corpusEntry) (ok bool) {
-hidden 7 more line matches
-
 github.com/golang/go/src/cmd/vendor/golang.org/x/sys/unix/ztypes_linux.go
 227:	Data         [7]byte
 449:	Data [8]uint32
diff --git a/internal/e2e/testdata/test_server.txt b/internal/e2e/testdata/test_server.txt
index e569d855..8cfce010 100644
--- a/internal/e2e/testdata/test_server.txt
+++ b/internal/e2e/testdata/test_server.txt
@@ -32,10 +32,10 @@ github.com/sourcegraph/sourcegraph-public-snapshot/cmd/gitserver/server/server.g
 741:func (s *Server) serverContext() (context.Context, context.CancelFunc) {
 hidden 166 more line matches
 
-github.com/sourcegraph/zoekt/cmd/zoekt-sourcegraph-indexserver/main.go
-150:type Server struct {
-1232:func startServer(conf rootConfig) error {
-1309:func newServer(conf rootConfig) (*Server, error) {
-hidden 52 more line matches
+github.com/sourcegraph/sourcegraph-public-snapshot/cmd/frontend/graphqlbackend/testing.go
+46:type Test struct {
+79:func RunTest(t *testing.T, test *Test) {
+58:func RunTests(t *testing.T, tests []*Test) {
+hidden 27 more line matches
 
 hidden 494 more file matches
diff --git a/internal/e2e/testdata/time_compare.txt b/internal/e2e/testdata/time_compare.txt
index 32da48b4..b6b732d5 100644
--- a/internal/e2e/testdata/time_compare.txt
+++ b/internal/e2e/testdata/time_compare.txt
@@ -29,10 +29,10 @@ github.com/golang/go/src/go/constant/value.go
 1381:		re := Compare(x.re, token.EQL, y.re)
 hidden 1 more line matches
 
-github.com/golang/go/src/syscall/zsyscall_windows.go
-878:func GetSystemTimeAsFileTime(time *Filetime) {
-1088:func SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error) {
-132:	procGetSystemTimeAsFileTime            = modkernel32.NewProc("GetSystemTimeAsFileTime")
-hidden 19 more line matches
+github.com/golang/go/src/cmd/go/internal/gover/gover.go
+36:func Compare(x, y string) int {
+20:// but at the time this code was written, there was an existing test that used
+49:	if c := cmp.Compare(vx.kind, vy.kind); c != 0 { // "" < alpha < beta < rc
+hidden 4 more line matches
 
 hidden 139 more file matches