Add namespace_labels configuration for kubernetes plugin (#2707)

plugin/kubernetes/namespace_test.go

@@ -0,0 +1,72 @@
+package kubernetes
+
+import (
+	"testing"
+)
+
+func TestFilteredNamespaceExists(t *testing.T) {
+	tests := []struct{
+		expected             bool
+		kubernetesNamespaces map[string]struct{}
+		testNamespace        string
+	}{
+		{true, map[string]struct{}{}, "foobar" },
+		{false, map[string]struct{}{}, "nsnoexist" },
+	}
+
+	k := Kubernetes{}
+	k.APIConn = &APIConnServeTest{}
+	for i, test := range tests {
+		k.Namespaces = test.kubernetesNamespaces
+		actual := k.filteredNamespaceExists(test.testNamespace)
+		if actual != test.expected {
+			t.Errorf("Test %d failed. Filtered namespace %s was expected to exist", i, test.testNamespace)
+		}
+	}
+}
+
+func TestNamespaceExposed(t *testing.T) {
+	tests := []struct{
+		expected             bool
+		kubernetesNamespaces map[string]struct{}
+		testNamespace        string
+	}{
+		{true, map[string]struct{}{ "foobar": {} }, "foobar" },
+		{false, map[string]struct{}{ "foobar": {} }, "nsnoexist" },
+		{true, map[string]struct{}{}, "foobar" },
+		{true, map[string]struct{}{}, "nsnoexist" },
+	}
+
+	k := Kubernetes{}
+	k.APIConn = &APIConnServeTest{}
+	for i, test := range tests {
+		k.Namespaces = test.kubernetesNamespaces
+		actual := k.configuredNamespace(test.testNamespace)
+		if actual != test.expected {
+			t.Errorf("Test %d failed. Namespace %s was expected to be exposed", i, test.testNamespace)
+		}
+	}
+}
+
+func TestNamespaceValid(t *testing.T) {
+	tests := []struct{
+		expected             bool
+		kubernetesNamespaces map[string]struct{}
+		testNamespace        string
+	}{
+		{true, map[string]struct{}{ "foobar": {} }, "foobar" },
+		{false, map[string]struct{}{ "foobar": {} }, "nsnoexist" },
+		{true, map[string]struct{}{}, "foobar" },
+		{false, map[string]struct{}{}, "nsnoexist" },
+	}
+
+	k := Kubernetes{}
+	k.APIConn = &APIConnServeTest{}
+	for i, test := range tests {
+		k.Namespaces = test.kubernetesNamespaces
+		actual := k.namespaceExposed(test.testNamespace)
+		if actual != test.expected {
+			t.Errorf("Test %d failed. Namespace %s was expected to be valid", i, test.testNamespace)
+		}
+	}
+}