diff --git a/Library/Homebrew/test/error_during_execution_spec.rb b/Library/Homebrew/test/error_during_execution_spec.rb
new file mode 100644
index 0000000000..4dd6d1ec3f
--- /dev/null
+++ b/Library/Homebrew/test/error_during_execution_spec.rb
@@ -0,0 +1,63 @@
+describe ErrorDuringExecution do
+  subject(:error) { described_class.new(command, status: status, output: output) }
+  let(:command) { ["false"] }
+  let(:status) { instance_double(Process::Status, exitstatus: exitstatus) }
+  let(:exitstatus) { 1 }
+  let(:output) { nil }
+
+  describe "#initialize" do
+    it "fails when only given a command" do
+      expect {
+        described_class.new(command)
+      }.to raise_error(ArgumentError)
+    end
+
+    it "fails when only given a status" do
+      expect {
+        described_class.new(status: status)
+      }.to raise_error(ArgumentError)
+    end
+
+    it "does not raise an error when given both a command and a status" do
+      expect {
+        described_class.new(command, status: status)
+      }.not_to raise_error
+    end
+  end
+
+  describe "#to_s" do
+    context "when only given a command and a status" do
+      its(:to_s) { is_expected.to eq "Failure while executing; `false` exited with 1." }
+    end
+
+    context "when additionally given the output" do
+      let(:output) {
+        [
+          [:stdout, "This still worked.\n"],
+          [:stderr, "Here something went wrong.\n"],
+        ]
+      }
+
+      before do
+        allow($stdout).to receive(:tty?).and_return(true)
+      end
+
+      its(:to_s) {
+        is_expected.to eq <<~EOS
+          Failure while executing; `false` exited with 1. Here's the output:
+          This still worked.
+          #{Formatter.error("Here something went wrong.\n")}
+        EOS
+      }
+    end
+
+    context "when command arguments contain special characters" do
+      let(:command) { ["env", "PATH=/bin", "cat", "with spaces"] }
+
+      its(:to_s) {
+        is_expected
+        .to eq 'Failure while executing; `env PATH=/bin cat with\ spaces` exited with 1.'
+      }
+    end
+  end
+end