1 files changed, 6 insertions, 0 deletions
diff --git a/Library/Homebrew/test/utils/popen_spec.rb b/Library/Homebrew/test/utils/popen_spec.rb
index 63bbc7b18..d1ae12d1c 100644
--- a/Library/Homebrew/test/utils/popen_spec.rb
+++ b/Library/Homebrew/test/utils/popen_spec.rb
@@ -15,6 +15,12 @@ describe Utils do
       ).to eq("success")
       expect($CHILD_STATUS).to be_a_success
     end
+
+    it "fails when the command does not exist" do
+      expect(subject.popen_read("./nonexistent", err: :out))
+        .to eq("brew: command not found: ./nonexistent\n")
+      expect($CHILD_STATUS).to be_a_failure
+    end
   end
 
   describe "::popen_write" do