diff --git a/url_checker_test.go b/url_checker_test.go
new file mode 100644
index 0000000..6d93dc2
--- /dev/null
+++ b/url_checker_test.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestURLCheckerCheck(t *testing.T) {
+	c := newURLChecker(0, newSemaphore(1024))
+
+	for _, u := range []string{"https://google.com", "README.md"} {
+		assert.Equal(t, nil, c.Check(u, "README.md"))
+	}
+
+	for _, u := range []string{"https://hey-hey-hi-google.com", "READYOU.md"} {
+		assert.NotEqual(t, nil, c.Check(u, "README.md"))
+	}
+}
+
+func TestURLCheckerCheckWithTimeout(t *testing.T) {
+	c := newURLChecker(30*time.Second, newSemaphore(1024))
+
+	for _, u := range []string{"https://google.com", "README.md"} {
+		assert.Equal(t, nil, c.Check(u, "README.md"))
+	}
+
+	for _, u := range []string{"https://hey-hey-hi-google.com", "READYOU.md"} {
+		assert.NotEqual(t, nil, c.Check(u, "README.md"))
+	}
+}
+
+func TestURLCheckerCheckMany(t *testing.T) {
+	c := newURLChecker(0, newSemaphore(1024))
+
+	for _, us := range [][]string{{}, {"https://google.com", "README.md"}} {
+		rc := make(chan urlResult, 1024)
+		c.CheckMany(us, "README.md", rc)
+
+		for r := range rc {
+			assert.NotEqual(t, "", r.url)
+			assert.Equal(t, nil, r.err)
+		}
+	}
+}