🐛 (go/v4): Refactor e2e-tests for readable logs #4159
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utils.go has a function to execute a command, and it returns the output if the command is successful. It returns a byte array, the same as the underlying exec.Cmd() provides. This, being a test heper function would make sense to return a string instead, so that the ergonomics of using Gomega assertions on strings work better by default. Removed the now unneccesary cast from []byte to string. Found an additional place where byte arrays were being asserted against ContainsSubstring (plugin_cluser_test.go).
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| @@ -54,10 +54,10 @@ func Run(cmd *exec.Cmd) ([]byte, error) { | |||
| _, _ = fmt.Fprintf(GinkgoWriter, "running: %s\n", command) | |||
| output, err := cmd.CombinedOutput() | |||
| if err != nil { | |||
| return output, fmt.Errorf("%s failed with error: (%v) %s", command, err, string(output)) | |||
| return "", fmt.Errorf("%s failed with error: (%v) %s", command, err, string(output)) | |||
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Then, we are no longer return the output when we we should here.
We need return the output.
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The output is in the error message, though. Generally the return values are zero-valued, or the error is nil. This is what Gomega checks, and so I replaced it with "" to adhere to the go idioms.
| @@ -54,10 +54,10 @@ func Run(cmd *exec.Cmd) ([]byte, error) { | |||
| _, _ = fmt.Fprintf(GinkgoWriter, "running: %s\n", command) | |||
| output, err := cmd.CombinedOutput() | |||
| if err != nil { | |||
| return output, fmt.Errorf("%s failed with error: (%v) %s", command, err, string(output)) | |||
| return "", fmt.Errorf("%s failed with error: (%v) %s", command, err, string(output)) | |||
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we should return the output always.
| @@ -110,7 +110,7 @@ var _ = Describe("Manager", Ordered, func() { | |||
| "pods", controllerPodName, "-o", "jsonpath={.status.phase}", | |||
| "-n", namespace, | |||
| ) | |||
| g.Expect(utils.Run(cmd)).To(BeEquivalentTo("Running"), "Incorrect controller-manager pod status") | |||
| g.Expect(utils.Run(cmd)).To(Equal("Running"), "Incorrect controller-manager pod status") | |||
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Just for curiosity,
what is the diff between BeEquivalentTo and Equal do you know?
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Equal checks for equality while BeEquivalentTo does some type conversion, like between string and []byte. Unfortunately, it still prints out the byte array representation. Equals doesn't allow a byte array to be compared to a string.
My recent PR #4141 introduced a problem with error reporting. Previously, error resporting would contain the output of the command that it was matching against (e.g. a substring). After #4141, a byte array was being printed out, making it unreadable. This PR fixes that, making the error output readable again.
utils.go has a function to execute a command, and it returns the output if the command is successful. It returns a byte array, the same as the underlying exec.Cmd() provides. This, being a test heper function would make sense to return a string instead, so that the ergonomics of using Gomega assertions on strings work better by default.
Removed the now unneccesary cast from []byte to string.
Shamelessly stole the title from #4158.
Closes #4158
Part of #4135