From 91766058d76044fa7e07f75c586bc7f89b868328 Mon Sep 17 00:00:00 2001
From: xengineering <me@xengineering.eu>
Date: Fri, 30 Jun 2023 11:57:34 +0200
Subject: Add unit test for routing function

---
 xmpp/router_test.go | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 xmpp/router_test.go

diff --git a/xmpp/router_test.go b/xmpp/router_test.go
new file mode 100644
index 0000000..ea13712
--- /dev/null
+++ b/xmpp/router_test.go
@@ -0,0 +1,69 @@
+package xmpp
+
+import (
+	"encoding/xml"
+	"testing"
+	"strings"
+)
+
+// routerTest contains a single test case for the xmpp.router. The XML element
+// is given as a string and the value int describes the expected value of a
+// test variable inside the corresponding unit test. See TestRouter for
+// details.
+type routerTest struct {
+	xml     string
+	value   int
+}
+
+// TestRouter tests the xmpp/router.go file. The central functionality is the
+// route() function. To test this a fake routing table is created inside this
+// test with XML element handler function produced by the factory function
+// defined below. each handler simply sets the value of the testpoint variable
+// to the value mentioned by the test point. That way the routing can be
+// validated.
+func TestRouter(t *testing.T) {
+	var testpoint int
+
+	factory := func(tp *int, i int) func([]xml.Token) {
+		return func([]xml.Token) {
+			*tp = i
+		}
+	}
+
+	tests := []routerTest{
+		routerTest{`<a></a>`, 1},
+		routerTest{`<b></b>`, 2},
+		routerTest{`<c></c>`, 3},
+		routerTest{`<b xmlns='https://xengineering.eu'></b>`, 4},
+		routerTest{`<a xmlns='https://xengineering.eu'></a>`, 5},
+	}
+
+	testRouting := routingTable{
+		{xml.Name{``, `a`}, factory(&testpoint, 1)},
+		{xml.Name{``, `b`}, factory(&testpoint, 2)},
+		{xml.Name{``, `c`}, factory(&testpoint, 3)},
+		{xml.Name{`https://xengineering.eu`, `b`}, factory(&testpoint, 4)},
+		{xml.Name{`https://xengineering.eu`, `a`}, factory(&testpoint, 5)},
+	}
+
+	for _, v := range tests {
+		testpoint = 0
+
+		r := strings.NewReader(v.xml)
+		d := xml.NewDecoder(r)
+		tokens := make([]xml.Token, 0)
+		for {
+			token, err := d.Token()
+			if err != nil {
+				break
+			}
+			tokens = append(tokens, xml.CopyToken(token))
+		}
+
+		route(tokens, testRouting)
+
+		if testpoint != v.value {
+			t.Fatalf("XML element was not routed correctly!\n")
+		}
+	}
+}
-- 
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