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📁 ..	-	2025-05-25 12:27
📄 README.md # Example You can instantiate `dynamodb.DynamoDB` and pass that as a parameter to all methods connecting to DynamoDB, or as `unitTest` demonstrates, create your own `type` and pass it along as a field. ## Test-compatible DynamoDB field If you use `dynamodb.DynamoDB` as a field, you will be unable to unit test it, as documented in #88. Cast it instead as `dynamodbiface.DynamoDBAPI`: ```go type ItemGetter struct { DynamoDB dynamodbiface.DynamoDBAPI } ``` ## Querying actual DynamoDB You'll need an `aws.Config` and `session.Session` for these to work correctly: ```go // Setup var getter = new(ItemGetter) var config aws.Config = &aws.Config{Region: aws.String("us-west-2"),} var sess session.Session = session.NewSession(config) var svc dynamodb.DynamoDB = dynamodb.New() getter.DynamoDB = dynamodbiface.DynamoDBAPI(svc) // Finally getter.DynamoDB.GetItem(/ ... /) ``` ## Querying in tests Construct a `fakeDynamoDB` and add the necessary methods for each of those structs (custom ones for `ItemGetter` and [whatever methods you're using for DynamoDB](https://github.com/aws/aws-sdk-go/blob/main/service/dynamodb/dynamodbiface/interface.go)), and you're good to go! ```go type fakeDynamoDB struct { dynamodbiface.DynamoDBAPI } var getter = new(ItemGetter) getter.DynamoDB = &fakeDynamoDB{} // And to run it (assuming you've mocked fakeDynamoDB.GetItem) getter.DynamoDB.GetItem(/ ... */) ``` ## Output ``` $ go test -tags example -cover PASS coverage: 100.0% of statements ok _/Users/shatil/workspace/aws-sdk-go/example/service/dynamodb/unitTest 0.008s ```	1.54 KB	2025-05-25 12:27
📄 unitTest.go //go:build example // +build example // Package unitTest demonstrates how to unit test, without needing to pass a // connector to every function, code that uses DynamoDB. package unitTest import ( "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/service/dynamodb" "github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute" "github.com/aws/aws-sdk-go/service/dynamodb/dynamodbiface" ) // ItemGetter can be assigned a DynamoDB connector like: // svc := dynamodb.DynamoDB(sess) // getter.DynamoDB = dynamodbiface.DynamoDBAPI(svc) type ItemGetter struct { DynamoDB dynamodbiface.DynamoDBAPI } // Get a value from a DynamoDB table containing entries like: // {"id": "my primary key", "value": "valuable value"} func (ig ItemGetter) Get(id string) (value string) { var input = &dynamodb.GetItemInput{ Key: map[string]dynamodb.AttributeValue{ "id": { S: aws.String(id), }, }, TableName: aws.String("my_table"), AttributesToGet: []*string{ aws.String("value"), }, } if output, err := ig.DynamoDB.GetItem(input); err == nil { if _, ok := output.Item["value"]; ok { dynamodbattribute.Unmarshal(output.Item["value"], &value) } } return }	1.16 KB	2025-05-25 12:27
📄 unitTest_test.go //go:build example // +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) } }	1.78 KB	2025-05-25 12:27

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