Feature complete. I may change the names, and error-handling needs to be more robust. I feel pretty good about resisting bad input, but not so good about saving to or writing from complex data structures, or maps with interface{} elements.

write_test.go

@@ -0,0 +1,53 @@
+package ndb
+
+import (
+	"testing"
+)
+
+var structWriteTests = []struct {
+	in  netCfg
+	out string
+}{
+	{
+		netCfg{"p2-jbs239", []int{64, 52, 100}, 666},
+		"host-name=p2-jbs239 vlan=64 vlan=52 vlan=100 native-vlan=666",
+	},
+	{
+		netCfg{"p2-cass304", []int{55, 10}, 1},
+		"host-name=p2-cass304 vlan=55 vlan=10 native-vlan=1",
+	},
+}
+
+var mapWriteTests = []struct {
+	in map[string] string
+	out string
+}{
+	{
+		map[string] string {"user": "jenkins", "group": "jenkins"},
+		"user=jenkins group=jenkins",
+	},
+}
+
+func TestStructWrite(t *testing.T) {
+	for _, tt := range structWriteTests {
+		if b, err := Emit(tt.in); err != nil {
+			t.Error(err)
+		} else if string(b) != tt.out {
+			t.Errorf("Wanted %s, got %s", tt.out, string(b))
+		} else {
+			t.Logf("%v => %s", tt.in, string(b))
+		}
+	}
+}
+
+func TestMapWrite(t *testing.T) {
+	for _, tt := range mapWriteTests {
+		if b, err := Emit(tt.in); err != nil {
+			t.Error(err)
+		} else if string(b) != tt.out {
+			t.Errorf("Wanted %s, got %s", tt.out, string(b))
+		} else {
+			t.Logf("%v => %s", tt.in, string(b))
+		}
+	}
+}