add more unit tests

pkg/minikube/driver/driver_test.go

@@ -23,6 +23,7 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
+	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/registry"
 )
 
@@ -202,6 +203,60 @@ func TestSuggest(t *testing.T) {
 	}
 }
 
+func TestMachineName(t *testing.T) {
+	testsCases := []struct {
+		ClusterConfig config.ClusterConfig
+		Want          string
+	}{
+		{
+			ClusterConfig: config.ClusterConfig{Name: "minikube",
+				Nodes: []config.Node{
+					config.Node{
+						Name:              "",
+						IP:                "172.17.0.3",
+						Port:              8443,
+						KubernetesVersion: "v1.19.2",
+						ControlPlane:      true,
+						Worker:            true,
+					},
+				},
+			},
+			Want: "minikube",
+		},
+
+		{
+			ClusterConfig: config.ClusterConfig{Name: "p2",
+				Nodes: []config.Node{
+					config.Node{
+						Name:              "",
+						IP:                "172.17.0.3",
+						Port:              8443,
+						KubernetesVersion: "v1.19.2",
+						ControlPlane:      true,
+						Worker:            true,
+					},
+					config.Node{
+						Name:              "m2",
+						IP:                "172.17.0.4",
+						Port:              0,
+						KubernetesVersion: "v1.19.2",
+						ControlPlane:      false,
+						Worker:            true,
+					},
+				},
+			},
+			Want: "p2-m2",
+		},
+	}
+
+	for _, tc := range testsCases {
+		got := MachineName(tc.ClusterConfig, tc.ClusterConfig.Nodes[len(tc.ClusterConfig.Nodes)-1])
+		if got != tc.Want {
+			t.Errorf("Expected MachineName to be %q but got %q", tc.Want, got)
+		}
+	}
+}
+
 func TestIndexFromMachineName(t *testing.T) {
 	testCases := []struct {
 		Name        string
@@ -247,3 +302,60 @@ func TestIndexFromMachineName(t *testing.T) {
 
 	}
 }
+
+// test against cluster config
+func TestIndexFromMachineName2(t *testing.T) {
+
+	testsCases := []struct {
+		ClusterConfig config.ClusterConfig
+		Want          int
+	}{
+		{
+			ClusterConfig: config.ClusterConfig{Name: "minikube",
+				Nodes: []config.Node{
+					config.Node{
+						Name:              "",
+						IP:                "172.17.0.3",
+						Port:              8443,
+						KubernetesVersion: "v1.19.2",
+						ControlPlane:      true,
+						Worker:            true,
+					},
+				},
+			},
+			Want: 1,
+		},
+
+		{
+			ClusterConfig: config.ClusterConfig{Name: "p2",
+				Nodes: []config.Node{
+					config.Node{
+						Name:              "",
+						IP:                "172.17.0.3",
+						Port:              8443,
+						KubernetesVersion: "v1.19.2",
+						ControlPlane:      true,
+						Worker:            true,
+					},
+					config.Node{
+						Name:              "m2",
+						IP:                "172.17.0.4",
+						Port:              0,
+						KubernetesVersion: "v1.19.2",
+						ControlPlane:      false,
+						Worker:            true,
+					},
+				},
+			},
+			Want: 2,
+		},
+	}
+
+	for _, tc := range testsCases {
+		got := IndexFromMachineName(MachineName(tc.ClusterConfig, tc.ClusterConfig.Nodes[len(tc.ClusterConfig.Nodes)-1]))
+		if got != tc.Want {
+			t.Errorf("expected IndexFromMachineName to be %d but got %d", tc.Want, got)
+		}
+
+	}
+}