Add some pkg/utils/url.go tests (#525)

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Fix: We do some more YouTube video ID parsing to ensure broken links (such as `youtube.com/watch?v=foobar?feature=share`) still return the actual video ID, since this is how the browser operates. (#488)
 - Dev: Document the `log-development` setting. (#491)
 - Dev: Document the `log-level` setting. (#490)
+- Dev: Add some `pkg/utils/url.go` tests. (#525)
 
 ## 2.0.2
 

pkg/utils/url_test.go

@@ -0,0 +1,47 @@
+package utils
+
+import (
+	"net/url"
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func makeUrl(rawurl string) *url.URL {
+	u, err := url.Parse(rawurl)
+	if err != nil {
+		panic(err)
+	}
+	return u
+}
+
+func TestIsSubdomainOf(t *testing.T) {
+	c := qt.New(t)
+	type tTest struct {
+		u *url.URL
+
+		parent   string
+		expected bool
+	}
+
+	tests := []tTest{
+		{
+			u:        makeUrl("https://www.youtube.com/watch?v=aTts9CnsAv8"),
+			parent:   "youtube.com",
+			expected: true,
+		},
+		{
+			u:        makeUrl("https://www.twitter.com/forsen"),
+			parent:   "youtube.com",
+			expected: false,
+		},
+	}
+
+	for _, test := range tests {
+		c.Run(test.u.String(), func(c *qt.C) {
+			actual := IsSubdomainOf(test.u, test.parent)
+			c.Assert(actual, qt.Equals, test.expected)
+		})
+	}
+
+}