diff --git a/app/crawler/crawler_test.go b/app/crawler/crawler_test.go
new file mode 100644
index 0000000..edfcb88
--- /dev/null
+++ b/app/crawler/crawler_test.go
@@ -0,0 +1,130 @@
+package crawler
+
+import (
+	"path"
+	"testing"
+
+	"github.com/fluxcapacitor2/easysearch/app/config"
+	"github.com/fluxcapacitor2/easysearch/app/database"
+)
+
+func createDB(t *testing.T) database.Database {
+	db, err := database.SQLiteFromFile(path.Join(t.TempDir(), "temp.db"))
+
+	if err != nil {
+		t.Fatalf("database creation failed: %v", err)
+	}
+
+	if err := db.Setup(); err != nil {
+		t.Fatalf("database setup failed: %v", err)
+	}
+
+	return db
+}
+
+func TestCrawl(t *testing.T) {
+	db := createDB(t)
+	source := config.Source{
+		ID:             "example",
+		AllowedDomains: []string{"www.example.com"},
+	}
+
+	url := "https://www.example.com"
+	res, err := Crawl(source, 1, url, db, url)
+
+	if err != nil {
+		t.Fatalf("error crawling URL %v: %v\n", url, err)
+	}
+
+	if res.Canonical != url {
+		t.Fatalf("unexpected canonical: %v != %v\n", res.Canonical, url)
+	}
+
+	if len(res.URLs) != 1 || res.URLs[0] != "https://www.iana.org/domains/example" {
+		t.Fatalf("unexpected URLs found: %v\n", res.URLs)
+	}
+}
+
+func TestCrawlWithRedirect(t *testing.T) {
+	db := createDB(t)
+	source := config.Source{
+		ID:             "example",
+		AllowedDomains: []string{"bswanson.dev", "www.bswanson.dev"},
+	}
+
+	url := "https://bswanson.dev"
+	expectedCanonical := "https://www.bswanson.dev/"
+	res, err := Crawl(source, 1, url, db, url)
+
+	if err != nil {
+		t.Fatalf("error crawling URL %v: %v\n", url, err)
+	}
+
+	if res.Canonical != expectedCanonical {
+		t.Fatalf("unexpected canonical: %v != %v\n", res.Canonical, expectedCanonical)
+	}
+}
+
+func TestCrawlWithForbiddenDomain(t *testing.T) {
+	db := createDB(t)
+	source := config.Source{
+		ID:             "example",
+		AllowedDomains: []string{"www.example.com"},
+	}
+
+	url := "https://bswanson.dev/portfolio"
+	_, err := Crawl(source, 1, url, db, url)
+
+	if err == nil {
+		t.Fatalf("expected error due to forbidden domain; none was received")
+	}
+}
+
+func TestCrawlWithServerError(t *testing.T) {
+	db := createDB(t)
+	source := config.Source{
+		ID:             "example",
+		AllowedDomains: []string{"httpstat.us"},
+	}
+
+	url := "https://httpstat.us/500"
+	_, err := Crawl(source, 1, url, db, url)
+
+	if err.Error() != "Internal Server Error" {
+		t.Fatalf("expected error due to 500 status; got %v\n", err)
+	}
+}
+
+func TestCrawlWithPageNotFound(t *testing.T) {
+	db := createDB(t)
+	source := config.Source{
+		ID:             "example",
+		AllowedDomains: []string{"httpstat.us"},
+	}
+
+	url := "https://httpstat.us/404"
+	_, err := Crawl(source, 1, url, db, url)
+
+	if err.Error() != "Not Found" {
+		t.Fatalf("expected error due to 404 status; got %v\n", err)
+	}
+}
+
+func TestSitemap(t *testing.T) {
+	db := createDB(t)
+	source := config.Source{
+		ID:             "example",
+		AllowedDomains: []string{"www.google.com"},
+	}
+
+	url := "https://www.google.com/sitemap.xml"
+	res, err := Crawl(source, 1, url, db, url)
+
+	if err != nil {
+		t.Errorf("error crawling Google sitemap: %v\n", err)
+	}
+
+	if len(res.URLs) < 20 {
+		t.Errorf("sitemap URLs were not discovered - expected >=20 URLs, got %+v\n", res)
+	}
+}