| 24 | ) |
| 25 | |
| 26 | func TestCreateConstructor(t *testing.T) { |
| 27 | testCases := []struct { |
| 28 | name string |
| 29 | constructorFn ConstructorFunc |
| 30 | |
| 31 | wantOutType reflect.Type |
| 32 | wantArgs []Arg |
| 33 | wantErr error |
| 34 | }{ |
| 35 | { |
| 36 | name: "nil constructor function", |
| 37 | constructorFn: nil, |
| 38 | wantErr: errors.New("nil constructor"), |
| 39 | }, |
| 40 | { |
| 41 | name: "invalid constructor function", |
| 42 | constructorFn: "string value", |
| 43 | wantErr: errors.New("constructor must be a function"), |
| 44 | }, |
| 45 | { |
| 46 | name: "multi result constructor function", |
| 47 | constructorFn: func() (string, int, error) { |
| 48 | return "", -1, nil |
| 49 | }, |
| 50 | wantErr: errors.New("constructor must only return one result"), |
| 51 | }, |
| 52 | { |
| 53 | name: "valid constructor function", |
| 54 | constructorFn: NewAnotherComponent, |
| 55 | wantOutType: reflect.TypeFor[*AnotherComponent](), |
| 56 | wantArgs: []Arg{ |
| 57 | { |
| 58 | 0, |
| 59 | "", |
| 60 | reflect.TypeFor[DependentComponent](), |
| 61 | }, |
| 62 | }, |
| 63 | }, |
| 64 | } |
| 65 | |
| 66 | for _, tc := range testCases { |
| 67 | t.Run(tc.name, func(t *testing.T) { |
| 68 | // given |
| 69 | |
| 70 | // when |
| 71 | constructor, err := createConstructor(tc.constructorFn) |
| 72 | |
| 73 | // then |
| 74 | if tc.wantErr != nil { |
| 75 | require.Equal(t, Constructor{}, constructor) |
| 76 | |
| 77 | require.Error(t, err) |
| 78 | require.EqualError(t, err, tc.wantErr.Error()) |
| 79 | return |
| 80 | } |
| 81 | |
| 82 | assert.NoError(t, err) |
| 83 | assert.Equal(t, tc.wantOutType, constructor.OutType()) |