diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 639e4a2d..6a6c016c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,7 +7,7 @@ env:
 jobs:
   osx:
     name: Create artifacts on macOS-latest
-    runs-on: macOS-latest
+    runs-on: macos-10.15
     steps:
       - name: Checkout the repository
         uses: actions/checkout@v2
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2d49ad40..a2369110 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,17 +25,15 @@ jobs:
             --slave /usr/bin/g++ g++ /usr/bin/g++-9
           bazelisk build //alphasql/...
           bazelisk test --test_output=errors //alphasql/...
-      - name: Test installation
-        run: |
-          temp=$(mktemp -d)
-          wget -P $temp https://github.com/Matts966/alphasql/releases/latest/download/alphasql_linux_x86_64.tar.gz \
-            && sudo tar -zxvf $temp/alphasql_linux_x86_64.tar.gz -C /usr/local/bin --strip=1
-          alphadag ./samples/sample
+
+          ./bazel-bin/alphasql/alphadag ./samples/sample
+          ./bazel-bin/alphasql/alphadag --output_path=dag.dot ./samples/sample
+          ./bazel-bin/alphasql/alphadag --external_required_tables_output_path=dag.dot ./samples/sample
 
 
   osx:
     name: Test the repository on Mac
-    runs-on: macOS-latest
+    runs-on: macos-10.15
     steps:
       - name: Checkout the repository
         uses: actions/checkout@v2
@@ -49,11 +47,11 @@ jobs:
           restore-keys: ${{ env.cache-version }}-${{ runner.os }}-bazelisk-build-
       - name: Test the repository
         run: |
-          make test
-      - name: Test installation
-        shell: bash
-        run: |
-          temp=$(mktemp -d)
-          wget -P $temp https://github.com/Matts966/alphasql/releases/latest/download/alphasql_darwin_x86_64.tar.gz \
-            && sudo tar -zxvf $temp/alphasql_darwin_x86_64.tar.gz -C /usr/local/bin --strip=1
+          brew install graphviz
+          sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
+          bazel shutdown
+          make
+
           alphadag ./samples/sample
+          alphadag --output_path=dag.dot ./samples/sample
+          alphadag --external_required_tables_output_path=dag.dot ./samples/sample
diff --git a/alphasql/alphadag.cc b/alphasql/alphadag.cc
index fc328eed..05da6569 100644
--- a/alphasql/alphadag.cc
+++ b/alphasql/alphadag.cc
@@ -17,6 +17,7 @@
 #include "absl/flags/flag.h"
 #include "alphasql/dag_lib.h"
 #include <filesystem>
+#include <system_error>
 #include <regex>
 
 std::regex DEFAULT_EXCLUDES(".*(.git/.*|.hg/.*|.svn/.*)");
@@ -248,8 +249,10 @@ int main(int argc, char *argv[]) {
         !std::filesystem::exists(output_path)) {
       std::filesystem::path parent =
           std::filesystem::path(output_path).parent_path();
-      if (!std::filesystem::is_directory(parent)) {
-        std::filesystem::create_directories(parent);
+      if (!std::filesystem::is_directory(parent) && parent != "") {
+        // Ignore error code for empty directory
+        std::error_code ec;
+        std::filesystem::create_directories(parent, ec);
       }
       std::ofstream out(output_path);
       write_graphviz_dp(out, g, dp);
@@ -275,7 +278,9 @@ int main(int argc, char *argv[]) {
           std::filesystem::path(external_required_tables_output_path)
               .parent_path();
       if (!std::filesystem::is_directory(parent)) {
-        std::filesystem::create_directories(parent);
+        // Ignore error code for empty directory
+        std::error_code ec;
+        std::filesystem::create_directories(parent, ec);
       }
       std::ofstream out(external_required_tables_output_path);
       for (const auto &required_table : external_required_tables) {