Add var for pr num and flag for vpc with test-integration

Makefile

@@ -19,11 +19,24 @@ GIT_COMMIT?=$(shell git rev-parse HEAD)
 BUILD_DATE?=$(shell date -u +"%Y-%m-%dT%H:%M:%SZ")
 LDFLAGS?="-X ${PKG}/pkg/driver.driverVersion=${VERSION} -X ${PKG}/pkg/driver.gitCommit=${GIT_COMMIT} -X ${PKG}/pkg/driver.buildDate=${BUILD_DATE}"
 
-AWS_K8S_TESTER_VERSION?=0.1.9
+# Hard-coded version is needed in case GitHub API rate limit is exceeded.
+# TODO: When aws-k8s-tester becomes a full release (https://developer.github.com/v3/repos/releases/#get-the-latest-release), use:
+# $(shell curl -s --request GET --url https://api.github.com/repos/aws/aws-k8s-tester/releases/latest | jq -r '.tag_name? // "<current version number>"')
+AWS_K8S_TESTER_VERSION?=$(shell curl -s --request GET --url https://api.github.com/repos/aws/aws-k8s-tester/tags | jq -r '.[0]?.name // "0.1.9"')
 AWS_K8S_TESTER_OS_ARCH?=$(shell go env GOOS)-amd64
 AWS_K8S_TESTER_DOWNLOAD_URL?=https://github.com/aws/aws-k8s-tester/releases/download/${AWS_K8S_TESTER_VERSION}/aws-k8s-tester-${AWS_K8S_TESTER_VERSION}-${AWS_K8S_TESTER_OS_ARCH}
 AWS_K8S_TESTER_PATH?=/tmp/aws-k8s-tester
 
+VPC_ID_FLAG=
+ifdef AWS_K8S_TESTER_VPC_ID
+	VPC_ID_FLAG=--vpc-id=${AWS_K8S_TESTER_VPC_ID}
+endif
+
+CSI_FLAG=--csi=master
+ifdef PULL_NUMBER
+	CSI_FLAG=--csi=${PULL_NUMBER}
+endif
+
 .PHONY: aws-ebs-csi-driver
 aws-ebs-csi-driver:
 	mkdir -p bin
@@ -41,7 +54,7 @@ test-sanity:
 test-integration:
 	curl -L ${AWS_K8S_TESTER_DOWNLOAD_URL} -o ${AWS_K8S_TESTER_PATH}
 	chmod +x ${AWS_K8S_TESTER_PATH}
-	aws-k8s-tester csi test integration --terminate-on-exit=true --csi=master --timeout=20m
+	${AWS_K8S_TESTER_PATH} csi test integration --terminate-on-exit=true --timeout=20m ${CSI_FLAG} ${VPC_ID_FLAG}
 
 .PHONY: test-e2e
 test-e2e:

tests/integration/README.md

@@ -14,6 +14,11 @@ Must satisfy also the requirements for `aws-ebs-csi-driver`
 make test-integration
 ```
 
+#### Overriding Defaults
+- The master branch of `aws-ebs-csi-driver` is used by default. To run using a pull request for `aws-ebs-csi-driver`, set `PULL_NUMBER` as an environment variable with a value equal to the pull request number.
+
+- When the tests are run, a new VPC is created by default. To run using an existing VPC, set `AWS_K8S_TESTER_VPC_ID` as an environment variable with a value equal to an existing VPC ID.
+
 ### Additional Information
 
 - GitHub [repo](https://github.com/aws/aws-k8s-tester) for `aws-k8s-tester`, which includes information about releases and running locally