Switch to ginkgo/gomega for tests

This switches over to ginkgo/gomega for tests, which makes writing
certain tests easier/more fluent in the future.

vendor/github.com/onsi/ginkgo/internal/leafnodes/it_node.go

@@ -0,0 +1,47 @@
+package leafnodes
+
+import (
+	"time"
+
+	"github.com/onsi/ginkgo/internal/failer"
+	"github.com/onsi/ginkgo/types"
+)
+
+type ItNode struct {
+	runner *runner
+
+	flag types.FlagType
+	text string
+}
+
+func NewItNode(text string, body interface{}, flag types.FlagType, codeLocation types.CodeLocation, timeout time.Duration, failer *failer.Failer, componentIndex int) *ItNode {
+	return &ItNode{
+		runner: newRunner(body, codeLocation, timeout, failer, types.SpecComponentTypeIt, componentIndex),
+		flag:   flag,
+		text:   text,
+	}
+}
+
+func (node *ItNode) Run() (outcome types.SpecState, failure types.SpecFailure) {
+	return node.runner.run()
+}
+
+func (node *ItNode) Type() types.SpecComponentType {
+	return types.SpecComponentTypeIt
+}
+
+func (node *ItNode) Text() string {
+	return node.text
+}
+
+func (node *ItNode) Flag() types.FlagType {
+	return node.flag
+}
+
+func (node *ItNode) CodeLocation() types.CodeLocation {
+	return node.runner.codeLocation
+}
+
+func (node *ItNode) Samples() int {
+	return 1
+}