test: make tests actually work when packages have vendored imports

Go's "..." syntax (eg, ./plugins/...) doesn't traverse symlinks, so
go test wasn't finding the vendor/ directory for imports.  To get around
that we have to specify each testable package specifically rather
than use "...".

build

@@ -2,7 +2,7 @@
 set -e
 
 ORG_PATH="github.com/containernetworking"
-REPO_PATH="${ORG_PATH}/plugins"
+export REPO_PATH="${ORG_PATH}/plugins"
 
 if [ ! -h gopath/src/${REPO_PATH} ]; then
 	mkdir -p gopath/src/${ORG_PATH}

test

@@ -9,6 +9,8 @@
 # CNI_PATH=../cni/bin ./test
 set -e
 
+source ./build
+
 if [ -z "$CNI_PATH" ]; then
 	echo "Need a valid CNI_PATH"
 	exit 1
@@ -23,12 +25,36 @@ fi
 #add our build path to CNI_PATH
 CNI_PATH=$(pwd)/bin:${CNI_PATH}
 
-## Build everything
-./build
-
 echo "Running tests"
 
-TEST=${PKG:-./plugins/...}
+TESTABLE="plugins/sample"
-sudo -E bash -c "umask 0; PATH=${PATH} CNI_PATH=${CNI_PATH} go test ${TEST}"
+
+# user has not provided PKG override
+if [ -z "$PKG" ]; then
+	TEST=$TESTABLE
+	FMT=$TESTABLE
+
+# user has provided PKG override
+else
+	# strip out slashes and dots from PKG=./foo/
+	TEST=${PKG//\//}
+	TEST=${TEST//./}
+
+	# only run gofmt on packages provided by user
+	FMT="$TEST"
+fi
+
+# split TEST into an array and prepend REPO_PATH to each local package
+split=(${TEST// / })
+TEST=${split[@]/#/${REPO_PATH}/}
+
+sudo -E bash -c "umask 0; PATH=${GOROOT}/bin:$(pwd)/bin:${PATH} CNI_PATH=${CNI_PATH} go test ${TEST}"
+
+echo "Checking gofmt..."
+fmtRes=$(gofmt -l $FMT)
+if [ -n "${fmtRes}" ]; then
+	echo -e "gofmt checking failed:\n${fmtRes}"
+	exit 255
+fi