1 files changed, 28 insertions, 0 deletions
diff --git a/Library/Homebrew/test/utils/popen_spec.rb b/Library/Homebrew/test/utils/popen_spec.rb
new file mode 100644
index 000000000..e3704a876
--- /dev/null
+++ b/Library/Homebrew/test/utils/popen_spec.rb
@@ -0,0 +1,28 @@
+require "utils/popen"
+
+describe Utils do
+  describe "::popen_read" do
+    it "reads the standard output of a given command" do
+      expect(subject.popen_read("sh", "-c", "echo success").chomp).to eq("success")
+      expect($?).to be_a_success
+    end
+
+    it "can be given a block to manually read from the pipe" do
+      expect(
+        subject.popen_read("sh", "-c", "echo success") do |pipe|
+          pipe.read.chomp
+        end,
+      ).to eq("success")
+      expect($?).to be_a_success
+    end
+  end
+
+  describe "::popen_write" do
+    it "with supports writing to a command's standard input" do
+      subject.popen_write("grep", "-q", "success") do |pipe|
+        pipe.write("success\n")
+      end
+      expect($?).to be_a_success
+    end
+  end
+end