diff --git a/internal/frontend/unit_main_test.go b/internal/frontend/unit_main_test.go
new file mode 100644
index 0000000..72a744a
--- /dev/null
+++ b/internal/frontend/unit_main_test.go
@@ -0,0 +1,88 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package frontend
+
+import (
+	"context"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"golang.org/x/pkgsite/internal"
+	"golang.org/x/pkgsite/internal/postgres"
+	"golang.org/x/pkgsite/internal/testing/sample"
+)
+
+func TestGetNestedModules(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), testTimeout)
+	defer cancel()
+	defer postgres.ResetTestDB(testDB, t)
+
+	for _, m := range []*internal.Module{
+		sample.LegacyModule("cloud.google.com/go", "v0.46.2", "storage", "spanner", "pubsub"),
+		sample.LegacyModule("cloud.google.com/go/pubsub", "v1.6.1", sample.Suffix),
+		sample.LegacyModule("cloud.google.com/go/spanner", "v1.9.0", sample.Suffix),
+		sample.LegacyModule("cloud.google.com/go/storage", "v1.10.0", sample.Suffix),
+		sample.LegacyModule("cloud.google.com/go/storage/v11", "v11.0.0", sample.Suffix),
+		sample.LegacyModule("cloud.google.com/go/storage/v9", "v9.0.0", sample.Suffix),
+		sample.LegacyModule("cloud.google.com/go/storage/module", "v1.10.0", sample.Suffix),
+		sample.LegacyModule("cloud.google.com/go/v2", "v2.0.0", "storage", "spanner", "pubsub"),
+	} {
+		if err := testDB.InsertModule(ctx, m); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	for _, tc := range []struct {
+		modulePath string
+		want       []*NestedModule
+	}{
+		{
+			modulePath: "cloud.google.com/go",
+			want: []*NestedModule{
+				{
+					Suffix: "pubsub",
+					URL:    "/cloud.google.com/go/pubsub",
+				},
+				{
+					Suffix: "spanner",
+					URL:    "/cloud.google.com/go/spanner",
+				},
+				{
+					Suffix: "storage",
+					URL:    "/cloud.google.com/go/storage/v11",
+				},
+				{
+					Suffix: "storage/module",
+					URL:    "/cloud.google.com/go/storage/module",
+				},
+			},
+		},
+		{
+			modulePath: "cloud.google.com/go/spanner",
+		},
+		{
+			modulePath: "cloud.google.com/go/storage",
+			want: []*NestedModule{
+				{
+					Suffix: "module",
+					URL:    "/cloud.google.com/go/storage/module",
+				},
+			},
+		},
+	} {
+		t.Run(tc.modulePath, func(t *testing.T) {
+			got, err := getNestedModules(ctx, testDB, &internal.UnitMeta{
+				Path:       tc.modulePath,
+				ModulePath: tc.modulePath,
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+			if diff := cmp.Diff(tc.want, got); diff != "" {
+				t.Errorf("mismatch (-want +got):\n%s", diff)
+			}
+		})
+	}
+}
diff --git a/internal/frontend/unit_test.go b/internal/frontend/unit_test.go
index 930cfa8..541cade 100644
--- a/internal/frontend/unit_test.go
+++ b/internal/frontend/unit_test.go
@@ -5,12 +5,10 @@
 package frontend
 
 import (
-	"context"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
 	"golang.org/x/pkgsite/internal"
-	"golang.org/x/pkgsite/internal/postgres"
 	"golang.org/x/pkgsite/internal/stdlib"
 	"golang.org/x/pkgsite/internal/testing/sample"
 )
@@ -83,76 +81,3 @@
 		})
 	}
 }
-
-func TestGetNestedModules(t *testing.T) {
-	ctx, cancel := context.WithTimeout(context.Background(), testTimeout)
-	defer cancel()
-	defer postgres.ResetTestDB(testDB, t)
-
-	for _, m := range []*internal.Module{
-		sample.LegacyModule("cloud.google.com/go", "v0.46.2", "storage", "spanner", "pubsub"),
-		sample.LegacyModule("cloud.google.com/go/pubsub", "v1.6.1", sample.Suffix),
-		sample.LegacyModule("cloud.google.com/go/spanner", "v1.9.0", sample.Suffix),
-		sample.LegacyModule("cloud.google.com/go/storage", "v1.10.0", sample.Suffix),
-		sample.LegacyModule("cloud.google.com/go/storage/v11", "v11.0.0", sample.Suffix),
-		sample.LegacyModule("cloud.google.com/go/storage/v9", "v9.0.0", sample.Suffix),
-		sample.LegacyModule("cloud.google.com/go/storage/module", "v1.10.0", sample.Suffix),
-		sample.LegacyModule("cloud.google.com/go/v2", "v2.0.0", "storage", "spanner", "pubsub"),
-	} {
-		if err := testDB.InsertModule(ctx, m); err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	for _, tc := range []struct {
-		modulePath string
-		want       []*NestedModule
-	}{
-		{
-			modulePath: "cloud.google.com/go",
-			want: []*NestedModule{
-				{
-					Suffix: "pubsub",
-					URL:    "/cloud.google.com/go/pubsub",
-				},
-				{
-					Suffix: "spanner",
-					URL:    "/cloud.google.com/go/spanner",
-				},
-				{
-					Suffix: "storage",
-					URL:    "/cloud.google.com/go/storage/v11",
-				},
-				{
-					Suffix: "storage/module",
-					URL:    "/cloud.google.com/go/storage/module",
-				},
-			},
-		},
-		{
-			modulePath: "cloud.google.com/go/spanner",
-		},
-		{
-			modulePath: "cloud.google.com/go/storage",
-			want: []*NestedModule{
-				{
-					Suffix: "module",
-					URL:    "/cloud.google.com/go/storage/module",
-				},
-			},
-		},
-	} {
-		t.Run(tc.modulePath, func(t *testing.T) {
-			got, err := getNestedModules(ctx, testDB, &internal.UnitMeta{
-				Path:       tc.modulePath,
-				ModulePath: tc.modulePath,
-			})
-			if err != nil {
-				t.Fatal(err)
-			}
-			if diff := cmp.Diff(tc.want, got); diff != "" {
-				t.Errorf("mismatch (-want +got):\n%s", diff)
-			}
-		})
-	}
-}