Function TestDefaultContainer_RegisterSingleton

component/container_test.go:522–581

(t *testing.T)

}

func TestDefaultContainer_RegisterSingleton(t *testing.T) {
	testCases := []struct {
		name         string
		preCondition func(container Container)
		instanceName string
		instance     any

		wantErr error
	}{
		{
			name:         "empty name",
			instanceName: "",
			wantErr:      errors.New("empty name"),
		},
		{
			name:         "nil instance",
			instanceName: "anyInstanceName",
			instance:     nil,
			wantErr:      errors.New("nil instance"),
		},
		{
			name: "already registered",
			preCondition: func(container Container) {
				_ = container.RegisterSingleton("anyInstanceName", AnyComponent{})
			},
			instanceName: "anyInstanceName",
			instance:     AnyComponent{},
			wantErr:      ErrInstanceAlreadyExists,
		},
		{
			name:         "valid singleton",
			instanceName: "anyInstanceName",
			instance:     &AnyComponent{},
			wantErr:      nil,
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			// given
			container := NewDefaultContainer()

			if tc.preCondition != nil {
				tc.preCondition(container)
			}

			// when
			err := container.RegisterSingleton(tc.instanceName, tc.instance)

			// then
			if tc.wantErr != nil {
				require.Error(t, err)
				require.EqualError(t, err, tc.wantErr.Error())
				return
			}

			assert.NoError(t, err)
		})