Remove the word middleware (#1067)

* Rename middleware to plugin

first pass; mostly used 'sed', few spots where I manually changed
text.

This still builds a coredns binary.

* fmt error

* Rename AddMiddleware to AddPlugin

* Readd AddMiddleware to remain backwards compat

plugin/normalize_test.go

@@ -0,0 +1,84 @@
+package plugin
+
+import "testing"
+
+func TestZoneMatches(t *testing.T) {
+	child := "example.org."
+	zones := Zones([]string{"org.", "."})
+	actual := zones.Matches(child)
+	if actual != "org." {
+		t.Errorf("Expected %v, got %v", "org.", actual)
+	}
+
+	child = "bla.example.org."
+	zones = Zones([]string{"bla.example.org.", "org.", "."})
+	actual = zones.Matches(child)
+
+	if actual != "bla.example.org." {
+		t.Errorf("Expected %v, got %v", "org.", actual)
+	}
+}
+
+func TestZoneNormalize(t *testing.T) {
+	zones := Zones([]string{"example.org", "Example.ORG.", "example.org."})
+	expected := "example.org."
+	zones.Normalize()
+
+	for _, actual := range zones {
+		if actual != expected {
+			t.Errorf("Expected %v, got %v\n", expected, actual)
+		}
+	}
+}
+
+func TestNameMatches(t *testing.T) {
+	matches := []struct {
+		child    string
+		parent   string
+		expected bool
+	}{
+		{".", ".", true},
+		{"example.org.", ".", true},
+		{"example.org.", "example.org.", true},
+		{"example.org.", "org.", true},
+		{"org.", "example.org.", false},
+	}
+
+	for _, m := range matches {
+		actual := Name(m.parent).Matches(m.child)
+		if actual != m.expected {
+			t.Errorf("Expected %v for %s/%s, got %v", m.expected, m.parent, m.child, actual)
+		}
+
+	}
+}
+
+func TestNameNormalize(t *testing.T) {
+	names := []string{
+		"example.org", "example.org.",
+		"Example.ORG.", "example.org."}
+
+	for i := 0; i < len(names); i += 2 {
+		ts := names[i]
+		expected := names[i+1]
+		actual := Name(ts).Normalize()
+		if expected != actual {
+			t.Errorf("Expected %v, got %v\n", expected, actual)
+		}
+	}
+}
+
+func TestHostNormalize(t *testing.T) {
+	hosts := []string{".:53", ".", "example.org:53", "example.org.", "example.org.:53", "example.org.",
+		"10.0.0.0/8:53", "10.in-addr.arpa.", "10.0.0.0/9", "10.0.0.0/9.",
+		"dns://example.org", "example.org."}
+
+	for i := 0; i < len(hosts); i += 2 {
+		ts := hosts[i]
+		expected := hosts[i+1]
+		actual := Host(ts).Normalize()
+		if expected != actual {
+			t.Errorf("Expected %v, got %v\n", expected, actual)
+		}
+	}
+}