attribute_test.go

package expr

import (
	"fmt"
	"testing"

	"goa.design/goa/v3/eval"
)

func TestTaggedAttribute(t *testing.T) {
	tagged := &AttributeExpr{
		Type: &Object{
			&NamedAttributeExpr{
				Name: "Foo",
				Attribute: &AttributeExpr{
					Meta: MetaExpr{"foo": []string{"foo"}},
				},
			},
		},
	}
	cases := map[string]struct {
		a        *AttributeExpr
		expected string
	}{
		"tagged attribute": {
			a:        tagged,
			expected: "Foo",
		},
		"not object": {
			a: &AttributeExpr{
				Type: Boolean,
			},
			expected: "",
		},
		"no meta": {
			a: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name:      "Foo",
						Attribute: &AttributeExpr{},
					},
				},
			},
			expected: "",
		},
		"extended": {
			a: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name:      "bar",
						Attribute: &AttributeExpr{Type: String},
					},
				},
				Bases: []DataType{
					&UserTypeExpr{
						TypeName:      "Extended",
						AttributeExpr: tagged,
					},
				},
			},
			expected: "Foo",
		},
		"recursively extended": {
			a: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name:      "bar",
						Attribute: &AttributeExpr{Type: String},
					},
				},
				Bases: []DataType{
					&UserTypeExpr{
						TypeName: "Extended",
						AttributeExpr: &AttributeExpr{
							Type: &Object{
								&NamedAttributeExpr{
									Name: "foobar",
									Attribute: &AttributeExpr{
										Meta: MetaExpr{"foobar": []string{"foobar"}},
									},
								},
							},
							Bases: []DataType{
								&UserTypeExpr{
									TypeName:      "AnotherExtended",
									AttributeExpr: tagged,
								},
							},
						},
					},
				},
			},
			expected: "Foo",
		},
	}

	for k, tc := range cases {
		t.Run(k, func(t *testing.T) {
			if actual := TaggedAttribute(tc.a, "foo"); tc.expected != actual {
				t.Errorf("got %#v, expected %#v", actual, tc.expected)
			}
		})
	}
}

func TestAttributeExprValidate(t *testing.T) {
	var (
		ctx           = "ctx"
		normalizedCtx = ctx + " - "

		validation = &ValidationExpr{
			Required: []string{"foo"},
		}

		metadata = MetaExpr{
			"view": []string{"foo"},
		}

		fieldNotExistType      = &Object{}
		notAResultType         = Boolean
		viewNotDefinedTypeName = "ViewNotDefinedType"

		errAttributeTypeNil      = fmt.Errorf("attribute type is nil")
		errRequiredFieldNotExist = fmt.Errorf(`%srequired field %q does not exist in type %s`, normalizedCtx, "foo", fieldNotExistType.Name())
		errViewButNotAResultType = fmt.Errorf("%s uses view %q but %q is not a result type", normalizedCtx, metadata["view"][0], notAResultType.Name())
		errTypeNotDefineView     = fmt.Errorf("%s: type %q does not define view %q", normalizedCtx, viewNotDefinedTypeName, "foo")
		errConflictingTypes      = fmt.Errorf("type \"%s\" has conflicting packages %s and %s", "SecondType", "types2", "types")
	)
	cases := map[string]struct {
		typ        DataType
		validation *ValidationExpr
		metadata   MetaExpr
		expected   *eval.ValidationErrors
	}{
		"no error": {
			typ:      Boolean,
			expected: &eval.ValidationErrors{},
		},
		"attribute type is nil": {
			typ:      nil,
			expected: &eval.ValidationErrors{Errors: []error{errAttributeTypeNil}},
		},
		"attribute type is nil in the object": {
			typ: &Object{
				&NamedAttributeExpr{
					Name: "foo",
					Attribute: &AttributeExpr{
						Type: nil,
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{errAttributeTypeNil}},
		},
		"attribute type is nil in the array": {
			typ: &Array{
				ElemType: &AttributeExpr{
					Type: nil,
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{errAttributeTypeNil}},
		},
		"required field does not exist": {
			typ: &Object{
				&NamedAttributeExpr{
					Name: "bar",
					Attribute: &AttributeExpr{
						Type: Boolean,
					},
				},
			},
			validation: validation,
			expected:   &eval.ValidationErrors{Errors: []error{errRequiredFieldNotExist}},
		},
		"required field does not exist in the object": {
			typ: &Object{
				&NamedAttributeExpr{
					Name: "bar",
					Attribute: &AttributeExpr{
						Type: &Object{
							&NamedAttributeExpr{
								Name: "baz",
								Attribute: &AttributeExpr{
									Type: Boolean,
								},
							},
						},
					},
				},
			},
			validation: validation,
			expected:   &eval.ValidationErrors{Errors: []error{errRequiredFieldNotExist}},
		},
		"required field does not exist in the array": {
			typ: &Object{
				&NamedAttributeExpr{
					Name: "bar",
					Attribute: &AttributeExpr{
						Type: &Array{
							ElemType: &AttributeExpr{
								Type: Boolean,
							},
						},
					},
				},
			},
			validation: validation,
			expected:   &eval.ValidationErrors{Errors: []error{errRequiredFieldNotExist}},
		},
		"required field exists in extended attribute": {
			typ: &UserTypeExpr{
				TypeName: "Extended2Attr",
				AttributeExpr: &AttributeExpr{
					Type: &Object{
						&NamedAttributeExpr{
							Name: "bar",
							Attribute: &AttributeExpr{
								Type: &Array{
									ElemType: &AttributeExpr{
										Type: Boolean,
									},
								},
							},
						},
					},
					Bases: []DataType{
						&UserTypeExpr{
							TypeName: "Extended1Attr",
							AttributeExpr: &AttributeExpr{
								Type: &Object{
									&NamedAttributeExpr{
										Name: "foobar",
										Attribute: &AttributeExpr{
											Type: &Array{
												ElemType: &AttributeExpr{
													Type: Boolean,
												},
											},
										},
									},
								},
								Bases: []DataType{
									&UserTypeExpr{
										TypeName: "Attr",
										AttributeExpr: &AttributeExpr{
											Type: &Object{
												&NamedAttributeExpr{
													Name: "foo",
													Attribute: &AttributeExpr{
														Type: &Array{
															ElemType: &AttributeExpr{
																Type: Boolean,
															},
														},
													},
												},
											},
										},
									},
								},
							},
						},
					},
				},
			},
			validation: validation,
			expected:   &eval.ValidationErrors{Errors: []error{}},
		},
		"defines a view but is not a result type": {
			typ:      Boolean,
			metadata: metadata,
			expected: &eval.ValidationErrors{Errors: []error{errViewButNotAResultType}},
		},
		"type does not define view": {
			typ: &ResultTypeExpr{
				UserTypeExpr: &UserTypeExpr{
					TypeName: viewNotDefinedTypeName,
					AttributeExpr: &AttributeExpr{
						Type: Boolean,
					},
				},
				Views: []*ViewExpr{
					{Name: "bar"},
				},
			},
			metadata: metadata,
			expected: &eval.ValidationErrors{Errors: []error{errTypeNotDefineView}},
		},
		"custom package in parent type": {
			typ: &UserTypeExpr{
				TypeName: "FirstType",
				AttributeExpr: &AttributeExpr{
					Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
					Type: &Object{
						&NamedAttributeExpr{
							Name: "thing",
							Attribute: &AttributeExpr{
								Type: &UserTypeExpr{
									AttributeExpr: &AttributeExpr{
										Type: &Object{
											&NamedAttributeExpr{
												Name: "Description",
												Attribute: &AttributeExpr{
													Type: String,
												},
											},
										},
									},
									TypeName: "SecondType",
								},
							},
						},
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{}},
		},
		"custom packages in child type": {
			typ: &UserTypeExpr{
				TypeName: "FirstType",
				AttributeExpr: &AttributeExpr{
					Type: &Object{
						&NamedAttributeExpr{
							Name: "thing",
							Attribute: &AttributeExpr{
								Type: &UserTypeExpr{
									AttributeExpr: &AttributeExpr{
										Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
										Type: &Object{
											&NamedAttributeExpr{
												Name: "Description",
												Attribute: &AttributeExpr{
													Type: String,
												},
											},
										},
									},
									TypeName: "SecondType",
								},
							},
						},
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{}},
		},
		"matching custom packages between sub-type and parent": {
			typ: &UserTypeExpr{
				TypeName: "FirstType",
				AttributeExpr: &AttributeExpr{
					Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
					Type: &Object{
						&NamedAttributeExpr{
							Name: "thing",
							Attribute: &AttributeExpr{
								Type: &UserTypeExpr{
									AttributeExpr: &AttributeExpr{
										Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
										Type: &Object{
											&NamedAttributeExpr{
												Name: "Description",
												Attribute: &AttributeExpr{
													Type: String,
												},
											},
										},
									},
									TypeName: "SecondType",
								},
							},
						},
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{}},
		},
		"conflicting custom packages between sub-type and parent": {
			typ: &UserTypeExpr{
				TypeName: "FirstType",
				AttributeExpr: &AttributeExpr{
					Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
					Type: &Object{
						&NamedAttributeExpr{
							Name: "thing",
							Attribute: &AttributeExpr{
								Type: &UserTypeExpr{
									AttributeExpr: &AttributeExpr{
										Meta: MetaExpr{"struct:pkg:path": []string{"types2"}},
										Type: &Object{
											&NamedAttributeExpr{
												Name: "Description",
												Attribute: &AttributeExpr{
													Type: String,
												},
											},
										},
									},
									TypeName: "SecondType",
								},
							},
						},
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{errConflictingTypes}},
		},
		"conflicting custom packages between sub-type in array and parent": {
			typ: &UserTypeExpr{
				TypeName: "FirstType",
				AttributeExpr: &AttributeExpr{
					Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
					Type: &Object{
						&NamedAttributeExpr{
							Name: "thing",
							Attribute: &AttributeExpr{
								Type: &Array{
									ElemType: &AttributeExpr{
										Type: &UserTypeExpr{
											AttributeExpr: &AttributeExpr{
												Meta: MetaExpr{"struct:pkg:path": []string{"types2"}},
												Type: &Object{
													&NamedAttributeExpr{
														Name: "Description",
														Attribute: &AttributeExpr{
															Type: String,
														},
													},
												},
											},
											TypeName: "SecondType",
										},
									},
								},
							},
						},
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{errConflictingTypes}},
		},
		"conflicting custom packages between sub-type in map key and parent": {
			typ: &UserTypeExpr{
				TypeName: "FirstType",
				AttributeExpr: &AttributeExpr{
					Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
					Type: &Object{
						&NamedAttributeExpr{
							Name: "thing",
							Attribute: &AttributeExpr{
								Type: &Map{
									KeyType: &AttributeExpr{
										Type: &UserTypeExpr{
											AttributeExpr: &AttributeExpr{
												Meta: MetaExpr{"struct:pkg:path": []string{"types2"}},
												Type: &Object{
													&NamedAttributeExpr{
														Name: "Description",
														Attribute: &AttributeExpr{
															Type: String,
														},
													},
												},
											},
											TypeName: "SecondType",
										},
									},
									ElemType: &AttributeExpr{
										Type: String,
									},
								},
							},
						},
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{errConflictingTypes}},
		},
		"conflicting custom packages between sub-type in map element and parent": {
			typ: &UserTypeExpr{
				TypeName: "FirstType",
				AttributeExpr: &AttributeExpr{
					Meta: MetaExpr{"struct:pkg:path": []string{"types"}},
					Type: &Object{
						&NamedAttributeExpr{
							Name: "thing",
							Attribute: &AttributeExpr{
								Type: &Map{
									KeyType: &AttributeExpr{
										Type: String,
									},
									ElemType: &AttributeExpr{
										Type: &UserTypeExpr{
											AttributeExpr: &AttributeExpr{
												Meta: MetaExpr{"struct:pkg:path": []string{"types2"}},
												Type: &Object{
													&NamedAttributeExpr{
														Name: "Description",
														Attribute: &AttributeExpr{
															Type: String,
														},
													},
												},
											},
											TypeName: "SecondType",
										},
									},
								},
							},
						},
					},
				},
			},
			expected: &eval.ValidationErrors{Errors: []error{errConflictingTypes}},
		},
	}

	for k, tc := range cases {
		attribute := AttributeExpr{
			Type:       tc.typ,
			Validation: tc.validation,
			Meta:       tc.metadata,
		}
		if actual := attribute.Validate(ctx, nil); tc.expected != actual {
			if len(tc.expected.Errors) != len(actual.Errors) {
				t.Errorf("%s: expected the number of error values to match %d got %d ", k, len(tc.expected.Errors), len(actual.Errors))
				if len(actual.Errors) > 0 {
					t.Errorf("%#v", actual.Errors[0])
				}
			} else {
				for i, err := range actual.Errors {
					if err.Error() != tc.expected.Errors[i].Error() {
						t.Errorf("%s: got %#v, expected %#v at index %d", k, err, tc.expected.Errors[i], i)
					}
				}
			}
		}
	}
}

func TestAttributeExprAllRequired(t *testing.T) {
	cases := map[string]struct {
		typ      DataType
		expected []string
	}{
		"some required": {
			typ: &UserTypeExpr{
				AttributeExpr: &AttributeExpr{
					Validation: &ValidationExpr{
						Required: []string{"foo", "bar"},
					},
				},
			},
			expected: []string{"foo", "bar"},
		},
		"no required": {
			typ:      Boolean,
			expected: nil,
		},
	}

	for k, tc := range cases {
		attribute := AttributeExpr{
			Type: tc.typ,
		}
		if actual := attribute.AllRequired(); len(tc.expected) != len(actual) {
			t.Errorf("%s: expected the number of all required values to match %d got %d ", k, len(tc.expected), len(actual))
		} else {
			for i, v := range actual {
				if v != tc.expected[i] {
					t.Errorf("%s: got %#v, expected %#v at index %d", k, v, tc.expected[i], i)
				}
			}
		}
	}
}

func TestAttributeExprIsRequired(t *testing.T) {
	cases := map[string]struct {
		attName  string
		expected bool
	}{
		"required": {
			attName:  "foo",
			expected: true,
		},
		"not required": {
			attName:  "bar",
			expected: false,
		},
	}

	for k, tc := range cases {
		attribute := AttributeExpr{
			Type: &UserTypeExpr{
				AttributeExpr: &AttributeExpr{
					Validation: &ValidationExpr{
						Required: []string{"foo"},
					},
				},
			},
		}
		if actual := attribute.IsRequired(tc.attName); tc.expected != actual {
			t.Errorf("%s: got %#v, expected %#v", k, actual, tc.expected)
		}
	}
}

func TestAttributeExprIsRequiredNoDefault(t *testing.T) {
	cases := map[string]struct {
		attName  string
		expected bool
	}{
		"required and no default value": {
			attName:  "foo",
			expected: true,
		},
		"required and default value": {
			attName:  "bar",
			expected: false,
		},
		"not required": {
			attName:  "baz",
			expected: false,
		},
	}

	attribute := AttributeExpr{
		Type: &UserTypeExpr{
			AttributeExpr: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name:      "foo",
						Attribute: &AttributeExpr{},
					},
					&NamedAttributeExpr{
						Name: "bar",
						Attribute: &AttributeExpr{
							DefaultValue: 1,
						},
					},
					&NamedAttributeExpr{
						Name:      "baz",
						Attribute: &AttributeExpr{},
					},
				},
				Validation: &ValidationExpr{
					Required: []string{"foo", "bar"},
				},
			},
		},
	}
	for k, tc := range cases {
		if actual := attribute.IsRequiredNoDefault(tc.attName); tc.expected != actual {
			t.Errorf("%s: got %#v, expected %#v", k, actual, tc.expected)
		}
	}
}

func TestAttributeExprIsPrimitivePointer(t *testing.T) {
	var (
		attributeBoolean = AttributeExpr{
			Type: Boolean,
		}
		attributeObject = AttributeExpr{
			Type: &Object{
				&NamedAttributeExpr{
					Name: "foo",
					Attribute: &AttributeExpr{
						Type: String,
					},
				},
				&NamedAttributeExpr{
					Name: "bar",
					Attribute: &AttributeExpr{
						Type: &Array{
							ElemType: &AttributeExpr{
								Type: String,
							},
						},
					},
				},
				&NamedAttributeExpr{
					Name: "baz",
					Attribute: &AttributeExpr{
						Type: Bytes,
					},
				},
				&NamedAttributeExpr{
					Name: "qux",
					Attribute: &AttributeExpr{
						Type: Any,
					},
				},
				&NamedAttributeExpr{
					Name: "quux",
					Attribute: &AttributeExpr{
						Type: String,
					},
				},
				&NamedAttributeExpr{
					Name: "corge",
					Attribute: &AttributeExpr{
						Type:         String,
						DefaultValue: "default",
					},
				},
			},
			Validation: &ValidationExpr{
				Required: []string{"quux"},
			},
		}
	)
	cases := map[string]struct {
		attribute  AttributeExpr
		attName    string
		useDefault bool
		expected   bool
	}{
		"primitive pointer": {
			attribute:  attributeObject,
			attName:    "foo",
			useDefault: false,
			expected:   true,
		},
		"no attribute": {
			attribute:  attributeObject,
			attName:    "zoo",
			useDefault: false,
			expected:   false,
		},
		"not primitive": {
			attribute:  attributeObject,
			attName:    "bar",
			useDefault: false,
			expected:   false,
		},
		"primitive but bytes": {
			attribute:  attributeObject,
			attName:    "baz",
			useDefault: false,
			expected:   false,
		},
		"primitive but any": {
			attribute:  attributeObject,
			attName:    "qux",
			useDefault: false,
			expected:   false,
		},
		"primitive but required": {
			attribute:  attributeObject,
			attName:    "quux",
			useDefault: false,
			expected:   false,
		},
		"primitive but default value": {
			attribute:  attributeObject,
			attName:    "corge",
			useDefault: true,
			expected:   false,
		},
		"non object": {
			attribute:  attributeBoolean,
			attName:    "",    // should have panicked!
			useDefault: false, // should have panicked!
			expected:   false, // should have panicked!
		},
	}

	for k, tc := range cases {
		func() {
			// panic recover
			defer func() {
				if k != "non object" {
					return
				}

				if recover() == nil {
					t.Errorf("should have panicked!")
				}
			}()

			if actual := tc.attribute.IsPrimitivePointer(tc.attName, tc.useDefault); tc.expected != actual {
				t.Errorf("%s: got %#v, expected %#v", k, actual, tc.expected)
			}
		}()
	}
}

func TestAttributeExprHasTag(t *testing.T) {
	var (
		tag = "view"
	)
	cases := map[string]struct {
		attribute *AttributeExpr
		tag       string
		expected  bool
	}{
		"has tag": {
			attribute: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name: "foo",
						Attribute: &AttributeExpr{
							Meta: MetaExpr{
								tag: []string{"default"},
							},
						},
					},
				},
			},
			tag:      tag,
			expected: true,
		},
		"attribute expr is nil": {
			attribute: nil,
			tag:       tag,
			expected:  false,
		},
		"not object": {
			attribute: &AttributeExpr{
				Type: String,
			},
			tag:      tag,
			expected: false,
		},
		"object but has no tag": {
			attribute: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name:      "foo",
						Attribute: &AttributeExpr{},
					},
				},
			},
			tag: tag,
		},
	}

	for k, tc := range cases {
		if actual := tc.attribute.HasTag(tc.tag); tc.expected != actual {
			t.Errorf("%s: got %#v, expected %#v", k, actual, tc.expected)
		}
	}
}

func TestAttributeExprHasTagPrefix(t *testing.T) {
	var (
		tag    = "security:apikey:api_key"
		prefix = "security:apikey"
	)
	cases := map[string]struct {
		attribute *AttributeExpr
		prefix    string
		expected  bool
	}{
		"has tag prefix": {
			attribute: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name: "foo",
						Attribute: &AttributeExpr{
							Meta: MetaExpr{
								tag: []string{"key"},
							},
						},
					},
				},
			},
			prefix:   prefix,
			expected: true,
		},
		"attribute expr is nil": {
			attribute: nil,
			prefix:    prefix,
			expected:  false,
		},
		"not object": {
			attribute: &AttributeExpr{
				Type: String,
			},
			prefix:   prefix,
			expected: false,
		},
		"object but has no tag": {
			attribute: &AttributeExpr{
				Type: &Object{
					&NamedAttributeExpr{
						Name:      "foo",
						Attribute: &AttributeExpr{},
					},
				},
			},
			prefix: prefix,
		},
	}

	for k, tc := range cases {
		if actual := tc.attribute.HasTagPrefix(tc.prefix); tc.expected != actual {
			t.Errorf("%s: got %#v, expected %#v", k, actual, tc.expected)
		}
	}
}

func TestAttributeExprHasDefaultValue(t *testing.T) {
	var (
		object = &Object{
			&NamedAttributeExpr{
				Name: "foo",
				Attribute: &AttributeExpr{
					DefaultValue: 1,
				},
			},
			&NamedAttributeExpr{
				Name:      "bar",
				Attribute: &AttributeExpr{},
			},
		}
	)
	cases := map[string]struct {
		attName  string
		typ      DataType
		expected bool
	}{
		"has default value": {
			attName:  "foo",
			typ:      object,
			expected: true,
		},
		"no default value": {
			attName:  "bar",
			typ:      object,
			expected: false,
		},
		"not object": {
			typ:      Boolean,
			expected: false,
		},
	}

	for k, tc := range cases {
		attribute := AttributeExpr{
			Type: tc.typ,
		}
		if actual := attribute.HasDefaultValue(tc.attName); tc.expected != actual {
			t.Errorf("%s: got %#v, expected %#v", k, actual, tc.expected)
		}
	}
}

func TestValidationExprHasRequiredOnly(t *testing.T) {
	var (
		values           = []any{"foo"}
		pattern          = "^foo$"
		exclusiveMinimum = 1.1
		minimum          = 1.1
		exclusiveMaximum = 2.2
		maximum          = 2.2
		minLength        = 2
		maxLength        = 3
	)
	cases := map[string]struct {
		values           []any
		format           ValidationFormat
		pattern          string
		exclusiveMinimum *float64
		minimum          *float64
		exclusiveMaximum *float64
		maximum          *float64
		minLength        *int
		maxLength        *int
		expected         bool
	}{
		"has required only": {
			expected: true,
		},
		"values is not nil": {
			values:   values,
			expected: false,
		},
		"format is not empty": {
			format:   FormatDate,
			expected: false,
		},
		"pattern is not empty": {
			pattern:  pattern,
			expected: false,
		},
		"exclusiveMinimum is not nil": {
			exclusiveMinimum: &exclusiveMinimum,
			expected:         false,
		},
		"minimum is not nil": {
			minimum:  &minimum,
			expected: false,
		},
		"exclusiveMaximum is not nil": {
			exclusiveMaximum: &exclusiveMaximum,
			expected:         false,
		},
		"maximum is not nil": {
			maximum:  &maximum,
			expected: false,
		},
		"min length is not nil": {
			minLength: &minLength,
			expected:  false,
		},
		"max length is not nil": {
			maxLength: &maxLength,
			expected:  false,
		},
		"complex validation": {
			values:           values,
			format:           FormatDate,
			pattern:          pattern,
			exclusiveMinimum: &exclusiveMinimum,
			minimum:          &minimum,
			exclusiveMaximum: &exclusiveMaximum,
			maximum:          &maximum,
			minLength:        &minLength,
			maxLength:        &maxLength,
			expected:         false,
		},
	}

	for k, tc := range cases {
		validation := &ValidationExpr{
			Values:           tc.values,
			Format:           tc.format,
			Pattern:          tc.pattern,
			ExclusiveMinimum: tc.exclusiveMinimum,
			Minimum:          tc.minimum,
			ExclusiveMaximum: tc.exclusiveMaximum,
			Maximum:          tc.maximum,
			MinLength:        tc.minLength,
			MaxLength:        tc.maxLength,
		}
		if actual := validation.HasRequiredOnly(); tc.expected != actual {
			t.Errorf("%s: got %#v, expected %#v", k, actual, tc.expected)
		}
	}
}

func TestAttributeExprEvalName(t *testing.T) {
	cases := map[string]struct {
		expected string
	}{
		"testcase": {expected: "attribute"},
	}
	for key, testcase := range cases {
		attribute := AttributeExpr{}
		if actual := attribute.EvalName(); actual != testcase.expected {
			t.Errorf("%s: got %#v, expected %#v", key, actual, testcase.expected)
		}
	}

}

func TestAttributeExprValidationValidate(t *testing.T) {
	var (
		max       = 1.0
		exclMax   = 2.0
		min       = 3.0
		ExclMin   = 4.0
		MaxLength = 5
		MinLength = 6
		parent    = &UserTypeExpr{
			AttributeExpr: &AttributeExpr{Type: String},
			TypeName:      "Parent",
		}
	)
	cases := map[string]struct {
		min, max, exclMin, exclMax *float64
		minLen, maxLen             *int
		expected                   string
	}{
		"min and max":         {min: &min, max: &max, expected: "attribute: minimum is greater than maximum"},
		"min and exclMax":     {min: &min, exclMax: &exclMax, expected: "attribute: minimum is greater than or equal to exclusive maximum"},
		"exclMin and max":     {exclMin: &ExclMin, max: &max, expected: "attribute: exclusive minimum is greater than or equal to maximum"},
		"exclMin and exclMax": {exclMin: &ExclMin, exclMax: &exclMax, expected: "attribute: exclusive minimum is greater than exclusive maximum"},
		"max and exclMax":     {max: &max, exclMax: &exclMax, expected: "attribute: both maximum and exclusive maximum are defined"},
		"min and exclMin":     {min: &min, exclMin: &ExclMin, expected: "attribute: both minimum and exclusive minimum are defined"},
		"minLen and maxLen":   {minLen: &MinLength, maxLen: &MaxLength, expected: "attribute: min length is greater than max length"},
	}
	for k, tc := range cases {
		validation := &ValidationExpr{
			Minimum:          tc.min,
			Maximum:          tc.max,
			ExclusiveMinimum: tc.exclMin,
			ExclusiveMaximum: tc.exclMax,
			MinLength:        tc.minLen,
			MaxLength:        tc.maxLen,
		}
		if actual := validation.Validate("", parent); actual.Error() != tc.expected {
			t.Errorf("%s: got %#v, expected %#v", k, actual.Error(), tc.expected)
		}
	}
}