test: add integration test for #221

tests/integration/tests/nodejs_direct-priority-over-transitive/flake.nix

@@ -0,0 +1,32 @@
+{
+  inputs = {
+    dream2nix.url = "github:nix-community/dream2nix";
+  };
+
+  outputs = {
+    self,
+    dream2nix,
+  }: (dream2nix.lib.makeFlakeOutputs {
+    systems = ["x86_64-linux"];
+    config.projectRoot = ./.;
+    source = ./.;
+    packageOverrides = {
+      test = {
+        "check-linked-bin-version" = {
+          postInstall = ''
+            npm run get-version
+            VERSION=$(cat VERSION)
+            echo "$VERSION"
+
+            if [ "$VERSION" = "2.8.0" ]; then
+              echo "correct version installed - direct dependency"
+            else
+              echo "wrong version installed - transitive dependency"
+              exit 1
+            fi
+          '';
+        };
+      };
+    };
+  });
+}

tests/integration/tests/nodejs_direct-priority-over-transitive/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "test",
+  "version": "1.0.0",
+  "scripts": {
+    "get-version": "svgo --version > VERSION"
+  },
+  "devDependencies": {
+    "svgo": "2.8.0",
+    "cssnano": "4.1.10"
+  }
+}