Added test for registering env vars

pkg/ephemeral/envvar_test.go

@@ -0,0 +1,64 @@
+package ephemeral_test
+
+import (
+	"os"
+	"testing"
+
+	. "gopkg.in/check.v1"
+	corev1 "k8s.io/api/core/v1"
+
+	"github.com/kanisterio/kanister/pkg/ephemeral"
+	"github.com/kanisterio/kanister/pkg/kube"
+)
+
+// Hook up gocheck into the "go test" runner.
+func Test(t *testing.T) { TestingT(t) }
+
+type EphemeralSuite struct{}
+
+var _ = Suite(&EphemeralSuite{})
+
+func (s *EphemeralSuite) TestRegisteringOSEnvVar(c *C) {
+	expected := []corev1.EnvVar{
+		{
+			Name:  "KANISTER_REGISTERED_OS_ENVVAR",
+			Value: "1",
+		},
+	}
+
+	options := &kube.PodOptions{}
+
+	// OS environment variable not set
+	var registeredAppliers ephemeral.ApplierList
+	registeredAppliers.Register(ephemeral.OSEnvVar(expected[0].Name))
+	registeredAppliers.Apply(options)
+
+	c.Assert(options.EnvironmentVariables, DeepEquals, []corev1.EnvVar(nil))
+
+	// OS environment variable set
+	os.Setenv(expected[0].Name, expected[0].Value)
+	defer os.Unsetenv(expected[0].Name)
+
+	registeredAppliers = ephemeral.ApplierList{}
+	registeredAppliers.Register(ephemeral.OSEnvVar(expected[0].Name))
+	registeredAppliers.Apply(options)
+
+	c.Assert(options.EnvironmentVariables, DeepEquals, expected)
+}
+
+func (s *EphemeralSuite) TestRegisteringStaticEnvVar(c *C) {
+	expected := []corev1.EnvVar{
+		{
+			Name:  "KANISTER_REGISTERED_STATIC_ENVVAR",
+			Value: "1",
+		},
+	}
+
+	options := &kube.PodOptions{}
+
+	var registeredAppliers ephemeral.ApplierList
+	registeredAppliers.Register(ephemeral.StaticEnvVar(expected[0].Name, expected[0].Value))
+	registeredAppliers.Apply(options)
+
+	c.Assert(options.EnvironmentVariables, DeepEquals, expected)
+}