1 files changed, 139 insertions, 0 deletions
diff --git a/Library/Homebrew/test/cask/system_command_spec.rb b/Library/Homebrew/test/cask/system_command_spec.rb
new file mode 100644
index 000000000..8d1180bea
--- /dev/null
+++ b/Library/Homebrew/test/cask/system_command_spec.rb
@@ -0,0 +1,139 @@
+describe Hbc::SystemCommand, :cask do
+  describe "when the exit code is 0" do
+    describe "its result" do
+      subject { described_class.run("/usr/bin/true") }
+
+      it { is_expected.to be_a_success }
+      its(:exit_status) { is_expected.to eq(0) }
+    end
+  end
+
+  describe "when the exit code is 1" do
+    let(:command) { "/usr/bin/false" }
+
+    describe "and the command must succeed" do
+      it "throws an error" do
+        expect {
+          described_class.run!(command)
+        }.to raise_error(Hbc::CaskCommandFailedError)
+      end
+    end
+
+    describe "and the command does not have to succeed" do
+      describe "its result" do
+        subject { described_class.run(command) }
+
+        it { is_expected.not_to be_a_success }
+        its(:exit_status) { is_expected.to eq(1) }
+      end
+    end
+  end
+
+  describe "given a pathname" do
+    let(:command) { "/bin/ls" }
+    let(:path)    { Pathname(Dir.mktmpdir) }
+
+    before do
+      FileUtils.touch(path.join("somefile"))
+    end
+
+    describe "its result" do
+      subject { described_class.run(command, args: [path]) }
+
+      it { is_expected.to be_a_success }
+      its(:stdout) { is_expected.to eq("somefile\n") }
+    end
+  end
+
+  describe "with both STDOUT and STDERR output from upstream" do
+    let(:command) { "/bin/bash" }
+    let(:options) {
+      { args: [
+        "-c",
+        "for i in $(seq 1 2 5); do echo $i; echo $(($i + 1)) >&2; done",
+      ] }
+    }
+
+    shared_examples "it returns '1 2 3 4 5 6'" do
+      describe "its result" do
+        subject { shutup { described_class.run(command, options) } }
+
+        it { is_expected.to be_a_success }
+        its(:stdout) { is_expected.to eq([1, 3, 5, nil].join("\n")) }
+        its(:stderr) { is_expected.to eq([2, 4, 6, nil].join("\n")) }
+      end
+    end
+
+    describe "with default options" do
+      it "echoes only STDERR" do
+        expected = [2, 4, 6].map { |i| "==> #{i}\n" }.join("")
+        expect {
+          described_class.run(command, options)
+        }.to output(expected).to_stdout
+      end
+
+      include_examples("it returns '1 2 3 4 5 6'")
+    end
+
+    describe "with print_stdout" do
+      before do
+        options.merge!(print_stdout: true)
+      end
+
+      it "echoes both STDOUT and STDERR" do
+        (1..6).each do |i|
+          expect {
+            described_class.run(command, options)
+          }.to output(/==> #{ i }/).to_stdout
+        end
+      end
+
+      include_examples("it returns '1 2 3 4 5 6'")
+    end
+
+    describe "without print_stderr" do
+      before do
+        options.merge!(print_stderr: false)
+      end
+
+      it "echoes nothing" do
+        expect {
+          described_class.run(command, options)
+        }.to output("").to_stdout
+      end
+
+      include_examples("it returns '1 2 3 4 5 6'")
+    end
+
+    describe "with print_stdout but without print_stderr" do
+      before do
+        options.merge!(print_stdout: true, print_stderr: false)
+      end
+
+      it "echoes only STDOUT" do
+        expected = [1, 3, 5].map { |i| "==> #{i}\n" }.join("")
+        expect {
+          described_class.run(command, options)
+        }.to output(expected).to_stdout
+      end
+
+      include_examples("it returns '1 2 3 4 5 6'")
+    end
+  end
+
+  describe "with a very long STDERR output" do
+    let(:command) { "/bin/bash" }
+    let(:options) {
+      { args: [
+        "-c",
+        "for i in $(seq 1 2 100000); do echo $i; echo $(($i + 1)) >&2; done",
+      ] }
+    }
+
+    it "returns without deadlocking" do
+      wait(15).for {
+        shutup { described_class.run(command, options) }
+      }.to be_a_success
+    end
+  end
+end