add unit test case for machine

Author: HaoyL666

cloud/scope/machine_test.go

@@ -400,6 +400,50 @@ func TestInstanceReconciliation(t *testing.T) {
 				gomock.InOrder(first, second)
 			},
 		},
+		{
+			name:          "retries fault domains discovered from availability domain cache",
+			errorExpected: false,
+			testSpecificSetup: func(machineScope *MachineScope, computeClient *mock_compute.MockComputeClient) {
+				setupAllParams(ms)
+				ociCluster := ms.OCIClusterAccessor.(OCISelfManagedCluster).OCICluster
+				ociCluster.Status.FailureDomains = map[string]clusterv1.FailureDomainSpec{
+					"1": {
+						Attributes: map[string]string{
+							"AvailabilityDomain": "ad1",
+						},
+					},
+				}
+				ociCluster.Spec.AvailabilityDomains = map[string]infrastructurev1beta2.OCIAvailabilityDomain{
+					"ad1": {
+						Name:         "ad1",
+						FaultDomains: []string{"FAULT-DOMAIN-1", "FAULT-DOMAIN-2"},
+					},
+				}
+				ms.Machine.Spec.FailureDomain = common.String("1")
+				computeClient.EXPECT().ListInstances(gomock.Any(), gomock.Eq(core.ListInstancesRequest{
+					DisplayName:   common.String("name"),
+					CompartmentId: common.String("test"),
+				})).Return(core.ListInstancesResponse{}, nil)
+
+				first := computeClient.EXPECT().LaunchInstance(gomock.Any(), Eq(func(request interface{}) error {
+					return faultDomainRequestMatcher(request, "")
+				})).Return(core.LaunchInstanceResponse{}, newOutOfCapacityServiceError("out of host capacity"))
+
+				second := computeClient.EXPECT().LaunchInstance(gomock.Any(), Eq(func(request interface{}) error {
+					return faultDomainRequestMatcher(request, "FAULT-DOMAIN-1")
+				})).Return(core.LaunchInstanceResponse{}, newOutOfCapacityServiceError("out of host capacity"))
+
+				third := computeClient.EXPECT().LaunchInstance(gomock.Any(), Eq(func(request interface{}) error {
+					return faultDomainRequestMatcher(request, "FAULT-DOMAIN-2")
+				})).Return(core.LaunchInstanceResponse{
+					Instance: core.Instance{
+						Id: common.String("instance-id"),
+					},
+				}, nil)
+
+				gomock.InOrder(first, second, third)
+			},
+		},
 		{
 			name:          "check all params together",
 			errorExpected: false,