diff --git a/Dockerfile b/Dockerfile
index 8ef34a1..45698fd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,6 +8,8 @@ RUN go mod download
 
 COPY . .
 
+RUN go test ./...
+
 RUN cd ./cli && CGO_ENABLED=0 GOOS=linux go build -o 15
 
 ENTRYPOINT ["./cli/15"]
diff --git a/lib/solver_test.go b/lib/solver_test.go
index d0d1b5a..cf0d5cd 100644
--- a/lib/solver_test.go
+++ b/lib/solver_test.go
@@ -11,7 +11,7 @@ func TestSolved(t *testing.T) {
 		t.Error("cost for solved board should be 0")
 	}
 
-	if *path.Pop() != *board {
+	if *path.Peek() != *board {
 		t.Error("root board should be in path")
 	}