cuelang.org/go@v0.13.0/cuego/cuego_test.go (about)

     1  // Copyright 2019 CUE Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package cuego
    16  
    17  import (
    18  	"reflect"
    19  	"testing"
    20  )
    21  
    22  type Sum struct {
    23  	A int `cue:"C-B" json:",omitempty"`
    24  	B int `cue:"C-A" json:",omitempty"`
    25  	C int `cue:"A+B & >=5" json:",omitempty"`
    26  }
    27  
    28  func checkErr(t *testing.T, got error, want string) {
    29  	t.Helper()
    30  	if (got == nil) != (want == "") {
    31  		t.Errorf("error: got %v; want %v", got, want)
    32  	}
    33  }
    34  func TestValidate(t *testing.T) {
    35  	fail := "some error"
    36  	testCases := []struct {
    37  		name        string
    38  		value       interface{}
    39  		constraints string
    40  		err         string
    41  	}{{
    42  		name:  "Sum",
    43  		value: Sum{A: 1, B: 4, C: 5},
    44  	}, {
    45  		name:  "*Sum",
    46  		value: &Sum{A: 1, B: 4, C: 5},
    47  	}, {
    48  		name:  "*Sum: incorrect sum",
    49  		value: &Sum{A: 1, B: 4, C: 6},
    50  		err:   fail,
    51  	}, {
    52  		name:  "*Sum: field C is too low",
    53  		value: &Sum{A: 1, B: 3, C: 4},
    54  		err:   fail,
    55  	}, {
    56  		name:  "*Sum: nil value",
    57  		value: (*Sum)(nil),
    58  		// }, {
    59  		// // TODO: figure out whether this constraint should constrain it
    60  		// // to a struct or not.
    61  		// name:        "*Sum: nil disallowed by constraint",
    62  		// value:       (*Sum)(nil),
    63  		// constraints: "!=null",
    64  		// err:         fail,
    65  	}, {
    66  		// Not a typical constraint, but it is possible.
    67  		name:        "string list",
    68  		value:       []string{"a", "b", "c"},
    69  		constraints: `[_, "b", ...]`,
    70  	}}
    71  
    72  	for _, tc := range testCases {
    73  		t.Run(tc.name, func(t *testing.T) {
    74  			c := &Context{}
    75  			if tc.constraints != "" {
    76  				err := c.Constrain(tc.value, tc.constraints)
    77  				if err != nil {
    78  					t.Fatal(err)
    79  				}
    80  			}
    81  			err := c.Validate(tc.value)
    82  			checkErr(t, err, tc.err)
    83  		})
    84  	}
    85  }
    86  
    87  func TestUpdate(t *testing.T) {
    88  	type sump struct {
    89  		A *int `cue:"C-B"`
    90  		B *int `cue:"C-A"`
    91  		C *int `cue:"A+B"`
    92  	}
    93  	one := 1
    94  	two := 2
    95  	fail := "some error"
    96  	_ = fail
    97  	_ = one
    98  	testCases := []struct {
    99  		name        string
   100  		value       interface{}
   101  		result      interface{}
   102  		constraints string
   103  		err         string
   104  	}{{
   105  		name:   "*Sum",
   106  		value:  &Sum{A: 1, B: 4, C: 5},
   107  		result: &Sum{A: 1, B: 4, C: 5},
   108  	}, {
   109  		name:   "*Sum",
   110  		value:  &Sum{A: 1, B: 4},
   111  		result: &Sum{A: 1, B: 4, C: 5},
   112  	}, {
   113  		name:   "*sump",
   114  		value:  &sump{A: &one, B: &one},
   115  		result: &sump{A: &one, B: &one, C: &two},
   116  	}, {
   117  		name:   "*Sum: backwards",
   118  		value:  &Sum{B: 4, C: 8},
   119  		result: &Sum{A: 4, B: 4, C: 8},
   120  	}, {
   121  		name:   "*Sum: sum too low",
   122  		value:  &Sum{A: 1, B: 3},
   123  		result: &Sum{A: 1, B: 3}, // Value should not be updated
   124  		err:    fail,
   125  	}, {
   126  		name:   "*Sum: sum underspecified",
   127  		value:  &Sum{A: 1},
   128  		result: &Sum{A: 1}, // Value should not be updated
   129  		err:    fail,
   130  	}, {
   131  		name:   "Sum: cannot modify",
   132  		value:  Sum{A: 3, B: 4, C: 7},
   133  		result: Sum{A: 3, B: 4, C: 7},
   134  		err:    fail,
   135  	}, {
   136  		name:   "*Sum: cannot update nil value",
   137  		value:  (*Sum)(nil),
   138  		result: (*Sum)(nil),
   139  		err:    fail,
   140  	}, {
   141  		name:   "cannot modify slice",
   142  		value:  []string{"a", "b", "c"},
   143  		result: []string{"a", "b", "c"},
   144  		err:    fail,
   145  	}}
   146  	for _, tc := range testCases {
   147  		t.Run(tc.name, func(t *testing.T) {
   148  			c := &Context{}
   149  			if tc.constraints != "" {
   150  				err := c.Constrain(tc.value, tc.constraints)
   151  				if err != nil {
   152  					t.Fatal(err)
   153  				}
   154  			}
   155  			err := c.Complete(tc.value)
   156  			checkErr(t, err, tc.err)
   157  			if !reflect.DeepEqual(tc.value, tc.result) {
   158  				t.Errorf("value:\n got: %#v;\nwant: %#v", tc.value, tc.result)
   159  			}
   160  		})
   161  	}
   162  }