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// +build example
// Unit tests for package unitTest.
package unitTest
import (
"errors"
"testing"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbiface"
)
// A fakeDynamoDB instance. During testing, instatiate ItemGetter, then simply
// assign an instance of fakeDynamoDB to it.
type fakeDynamoDB struct {
dynamodbiface.DynamoDBAPI
payload map[string]string // Store expected return values
err error
}
// Mock GetItem such that the output returned carries values identical to input.
func (fd *fakeDynamoDB) GetItem(input *dynamodb.GetItemInput) (*dynamodb.GetItemOutput, error) {
output := new(dynamodb.GetItemOutput)
output.Item = make(map[string]*dynamodb.AttributeValue)
for key, value := range fd.payload {
output.Item[key] = &dynamodb.AttributeValue{
S: aws.String(value),
}
}
return output, fd.err
}
func TestItemGetterGet(t *testing.T) {
expectedKey := "expected key"
expectedValue := "expected value"
getter := new(ItemGetter)
getter.DynamoDB = &fakeDynamoDB{
payload: map[string]string{"id": expectedKey, "value": expectedValue},
}
if actualValue := getter.Get(expectedKey); actualValue != expectedValue {
t.Errorf("Expected %q but got %q", expectedValue, actualValue)
}
}
// When DynamoDB.GetItem returns a non-nil error, expect an empty string.
func TestItemGetterGetFail(t *testing.T) {
expectedKey := "expected key"
expectedValue := "expected value"
getter := new(ItemGetter)
getter.DynamoDB = &fakeDynamoDB{
payload: map[string]string{"id": expectedKey, "value": expectedValue},
err: errors.New("any error"),
}
if actualValue := getter.Get(expectedKey); len(actualValue) > 0 {
t.Errorf("Expected %q but got %q", expectedValue, actualValue)
}
}
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