plugin/loadbalance: add parse and tests (#1947)

Automatically submitted.

plugin/loadbalance/setup_test.go

@@ -0,0 +1,43 @@
+package loadbalance
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/mholt/caddy"
+)
+
+func TestSetup(t *testing.T) {
+	tests := []struct {
+		input              string
+		shouldErr          bool
+		expectedPolicy     string
+		expectedErrContent string // substring from the expected error. Empty for positive cases.
+	}{
+		// positive
+		{`loadbalance`, false, "round_robin", ""},
+		{`loadbalance round_robin`, false, "round_robin", ""},
+		// negative
+		{`loadbalance fleeb`, true, "", "unknown policy"},
+		{`loadbalance a b`, true, "", "argument count or unexpected line"},
+	}
+
+	for i, test := range tests {
+		c := caddy.NewTestController("dns", test.input)
+		err := parse(c)
+
+		if test.shouldErr && err == nil {
+			t.Errorf("Test %d: Expected error but found %s for input %s", i, err, test.input)
+		}
+
+		if err != nil {
+			if !test.shouldErr {
+				t.Errorf("Test %d: Expected no error but found one for input %s. Error was: %v", i, test.input, err)
+			}
+
+			if !strings.Contains(err.Error(), test.expectedErrContent) {
+				t.Errorf("Test %d: Expected error to contain: %v, found error: %v, input: %s", i, test.expectedErrContent, err, test.input)
+			}
+		}
+	}
+}