location: extract backend specific part of StripPassword

The tests for the rest backend now reside there.

internal/backend/rest/config_test.go

@@ -36,3 +36,71 @@ var configTests = []test.ConfigTestData[Config]{
 func TestParseConfig(t *testing.T) {
 	test.ParseConfigTester(t, ParseConfig, configTests)
 }
+
+var passwordTests = []struct {
+	input    string
+	expected string
+}{
+	{
+		"rest:",
+		"rest:/",
+	},
+	{
+		"rest:localhost/",
+		"rest:localhost/",
+	},
+	{
+		"rest::123/",
+		"rest::123/",
+	},
+	{
+		"rest:http://",
+		"rest:http://",
+	},
+	{
+		"rest:http://hostname.foo:1234/",
+		"rest:http://hostname.foo:1234/",
+	},
+	{
+		"rest:http://user@hostname.foo:1234/",
+		"rest:http://user@hostname.foo:1234/",
+	},
+	{
+		"rest:http://user:@hostname.foo:1234/",
+		"rest:http://user:***@hostname.foo:1234/",
+	},
+	{
+		"rest:http://user:p@hostname.foo:1234/",
+		"rest:http://user:***@hostname.foo:1234/",
+	},
+	{
+		"rest:http://user:pppppaaafhhfuuwiiehhthhghhdkjaoowpprooghjjjdhhwuuhgjsjhhfdjhruuhsjsdhhfhshhsppwufhhsjjsjs@hostname.foo:1234/",
+		"rest:http://user:***@hostname.foo:1234/",
+	},
+	{
+		"rest:http://user:password@hostname",
+		"rest:http://user:***@hostname/",
+	},
+	{
+		"rest:http://user:password@:123",
+		"rest:http://user:***@:123/",
+	},
+	{
+		"rest:http://user:password@",
+		"rest:http://user:***@/",
+	},
+}
+
+func TestStripPassword(t *testing.T) {
+	// Make sure that the factory uses the correct method
+	StripPassword := NewFactory().StripPassword
+
+	for i, test := range passwordTests {
+		t.Run(test.input, func(t *testing.T) {
+			result := StripPassword(test.input)
+			if result != test.expected {
+				t.Errorf("test %d: expected '%s' but got '%s'", i, test.expected, result)
+			}
+		})
+	}
+}