adding mx and cname

docs/_functions/domain/CNAME.md

@@ -2,14 +2,14 @@
 name: CNAME
 parameters:
   - name
-  - address
+  - target
   - modifiers...
 ---
 
 CNAME adds a CNAME record to the domain. The name should be the relative label for the domain.
 Using `@` or `*` for CNAME records is not recommended, as different providers support them differently.
 
-Adress should be a string representing the CNAME target. If it is a single label we will assume it is a relative name on the current domain. If it contains *any* dots, it should be a fully qualified domain name, ending with a `.`.
+Target should be a string representing the CNAME target. If it is a single label we will assume it is a relative name on the current domain. If it contains *any* dots, it should be a fully qualified domain name, ending with a `.`.
 
 {% include startExample.html %}
 {% highlight js %}

docs/_functions/domain/MX.md

@@ -0,0 +1,25 @@
+---
+name: MX
+parameters:
+  - name
+  - priority
+  - target
+  - modifiers...
+---
+
+MX adds an MX record to the domain.
+
+Priority should be a number.
+
+Target should be a string representing the MX target. If it is a single label we will assume it is a relative name on the current domain. If it contains *any* dots, it should be a fully qualified domain name, ending with a `.`.
+
+{% include startExample.html %}
+{% highlight js %}
+
+D("example.com", REGISTRAR, DnsProvider(R53),
+  MX("@", 5, "mail"), // mx example.com -> mail.example.com
+  MX("sub", 10, "mail.foo.com.")
+);
+
+{%endhighlight%}
+{% include endExample.html %}

js/helpers.js

@@ -141,6 +141,7 @@ function TXT(name, target) {
 
 // MX(name,priority,target, recordModifiers...)
 function MX(name, priority, target) {
+    checkArgs([_.isString, _.isNumber, _.isString], arguments, "MX expects (name, priority, target)")
     var mods = getModifiers(arguments,3)
     return function(d) {
         mods.push(priority);
@@ -148,6 +149,17 @@ function MX(name, priority, target) {
     }
 }
 
+function checkArgs(checks, args, desc){
+    if (args.length < checks.length){
+        throw(desc)
+    }
+    for (var i = 0; i< checks.length; i++){
+        if (!checks[i](args[i])){
+            throw(desc+" - argument "+i+" is not correct type")
+        }
+    }
+}
+
 // NS(name,target, recordModifiers...)
 function NS(name, target) {
     var mods = getModifiers(arguments,2)

js/js_test.go

@@ -67,21 +67,17 @@ func TestParsedFiles(t *testing.T) {
 }
 
 func TestErrors(t *testing.T) {
-	files, err := ioutil.ReadDir(errorDir)
-	if err != nil {
-		t.Fatal(err)
+	tests := []struct{ desc, text string }{
+		{"old dsp style", `D("foo.com","reg","dsp")`},
+		{"MX no priority", `D("foo.com","reg",MX("@","test."))`},
+		{"MX reversed", `D("foo.com","reg",MX("@","test.", 5))`},
 	}
-	for _, f := range files {
-		if filepath.Ext(f.Name()) != ".js" {
-			continue
-		}
-		t.Log(f.Name(), "------")
-		content, err := ioutil.ReadFile(filepath.Join(errorDir, f.Name()))
-		if err != nil {
-			t.Fatal(err)
-		}
-		if _, err = ExecuteJavascript(string(content), true); err == nil {
-			t.Fatal("Expected error but found none")
-		}
+	for _, tst := range tests {
+		t.Run(tst.desc, func(t *testing.T) {
+			if _, err := ExecuteJavascript(tst.text, true); err == nil {
+				t.Fatal("Expected error but found none")
+			}
+		})
+
 	}
 }