capture_output.md

Plugin: Capture output

Kaocha has a plugin which will capture all output written to stdout or stderr during the test run. When tests pass this output is hidden, when they fail the output is made visible to help understand the problem.

This plugin is loaded by default, but can be disabled with --no-capture-output

Show output of failing test

• Given a file named "test/sample_test.clj" with:

(ns sample-test
  (:require [clojure.test :refer :all]))

(deftest stdout-pass-test
  (println "You peng zi yuan fang lai")
  (is (= :same :same)))

(deftest stdout-fail-test
  (println "Bu yi le hu?")
  (is (= :same :not-same)))

• When I run bin/kaocha

• Then the output should contain:

FAIL in sample-test/stdout-fail-test (sample_test.clj:10)
Expected:
  :same
Actual:
  -:same +:not-same
╭───── Test output ───────────────────────────────────────────────────────
│ Bu yi le hu?
╰─────────────────────────────────────────────────────────────────────────
2 tests, 2 assertions, 1 failures.

Bypass output capturing

• Given a file named "test/sample_test.clj" with:

(ns sample-test
  (:require [clojure.test :refer :all]
            [kaocha.plugin.capture-output :as capture]))

(deftest stdout-pass-test
  (capture/bypass
    (println "You peng zi yuan fang lai"))
  (is (= :same :same)))

• When I run bin/kaocha

• Then the output should contain:

[(You peng zi yuan fang lai
.)]
1 tests, 1 assertions, 0 failures.