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// +build go1.7
package expression
import (
"reflect"
"strings"
"testing"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/dynamodb"
)
// opeErrorMode will help with error cases and checking error types
type opeErrorMode string
const (
noOperandError opeErrorMode = ""
// unsetName error will occur if an empty string is passed into NameBuilder
unsetName = "unset parameter: NameBuilder"
// invalidName error will occur if a nested name has an empty intermediary
// attribute name (i.e. foo.bar..baz)
invalidName = "invalid parameter: NameBuilder"
// unsetKey error will occur if an empty string is passed into KeyBuilder
unsetKey = "unset parameter: KeyBuilder"
)
func TestBuildOperand(t *testing.T) {
cases := []struct {
name string
input OperandBuilder
expected exprNode
err opeErrorMode
}{
{
name: "basic name",
input: Name("foo"),
expected: exprNode{
names: []string{"foo"},
fmtExpr: "$n",
},
},
{
name: "duplicate name name",
input: Name("foo.foo"),
expected: exprNode{
names: []string{"foo", "foo"},
fmtExpr: "$n.$n",
},
},
{
name: "basic value",
input: Value(5),
expected: exprNode{
values: []dynamodb.AttributeValue{
{
N: aws.String("5"),
},
},
fmtExpr: "$v",
},
},
{
name: "nested name",
input: Name("foo.bar"),
expected: exprNode{
names: []string{"foo", "bar"},
fmtExpr: "$n.$n",
},
},
{
name: "nested name with index",
input: Name("foo.bar[0].baz"),
expected: exprNode{
names: []string{"foo", "bar", "baz"},
fmtExpr: "$n.$n[0].$n",
},
},
{
name: "basic size",
input: Name("foo").Size(),
expected: exprNode{
names: []string{"foo"},
fmtExpr: "size ($n)",
},
},
{
name: "key",
input: Key("foo"),
expected: exprNode{
names: []string{"foo"},
fmtExpr: "$n",
},
},
{
name: "unset key error",
input: Key(""),
expected: exprNode{},
err: unsetKey,
},
{
name: "empty name error",
input: Name(""),
expected: exprNode{},
err: unsetName,
},
{
name: "invalid name",
input: Name("foo..bar"),
expected: exprNode{},
err: invalidName,
},
{
name: "invalid index",
input: Name("[foo]"),
expected: exprNode{},
err: invalidName,
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
operand, err := c.input.BuildOperand()
if c.err != noOperandError {
if err == nil {
t.Errorf("expect error %q, got no error", c.err)
} else {
if e, a := string(c.err), err.Error(); !strings.Contains(a, e) {
t.Errorf("expect %q error message to be in %q", e, a)
}
}
} else {
if err != nil {
t.Errorf("expect no error, got unexpected Error %q", err)
}
if e, a := c.expected, operand.exprNode; !reflect.DeepEqual(a, e) {
t.Errorf("expect %v, got %v", e, a)
}
}
})
}
}
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