1 files changed, 15 insertions, 0 deletions
diff --git a/integrationtests/portnumber.go b/integrationtests/portnumber.go
new file mode 100644
index 0000000..94c2a11
--- /dev/null
+++ b/integrationtests/portnumber.go
@@ -0,0 +1,15 @@
+package integrationtests
+
+import "sync"
+
+var portNumberMutex sync.Mutex
+var currentPortNumber int = 4241
+
+// Go tests can run concurrently, so we need unique TCP port numbers for
+// each test.
+func getUniquePortNumber() int {
+	portNumberMutex.Lock()
+	defer portNumberMutex.Unlock()
+	currentPortNumber++
+	return currentPortNumber
+}