chore: improve vitest output (#6850)

* chore: improve vitest output * chore: address comments * chore: address comments
ChainSafe · Jun 5, 2024 · def34eb · def34eb
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diff --git a/docs/pages/contribution/testing/index.md b/docs/pages/contribution/testing/index.md
@@ -4,9 +4,11 @@ Testing is critical to the Lodestar project and there are many types of tests th
 
 There are few flags you can set through env variables to override behavior of testing and it's output.
 
-| ENV variable      | Effect | Impact                                                                                                      |
-| ----------------- | ------ | ----------------------------------------------------------------------------------------------------------- |
-| TEST_COMPACT_DIFF | All    | Will strip down the object difference rendered during test failures. Very useful for large object matching. |
+| ENV variable        | Effect | Impact                                                                                                                    |
+| ------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------- |
+| TEST_COMPACT_DIFF   | All    | Will strip down the object difference rendered during test failures. Very useful for large object matching.               |
+| TEST_QUIET_CONSOLE  | All    | Will strip down console output. Reduce console flickering.                                                                |
+| TEST_COMPACT_OUTPUT | All    | Display a condensed summary of tests run. Use vitest [basic](https://vitest.dev/guide/reporters#basic-reporter) reporter. |
 
 ### Unit Tests
 

diff --git a/vitest.base.unit.config.ts b/vitest.base.unit.config.ts
@@ -22,7 +22,7 @@ export default defineConfig({
     ],
     reporters: process.env.GITHUB_ACTIONS
       ? ["verbose", "hanging-process", "github-actions"]
-      : ["verbose", "hanging-process"],
+      : [process.env.TEST_COMPACT_OUTPUT ? "basic" : "verbose", "hanging-process"],
     coverage: {
       enabled: process.env.CI === "true",
       clean: true,
@@ -46,5 +46,6 @@ export default defineConfig({
       ],
     },
     diff: process.env.TEST_COMPACT_DIFF ? path.join(import.meta.dirname, "./scripts/vitest/vitest.diff.ts") : undefined,
+    onConsoleLog: () => !process.env.TEST_QUIET_CONSOLE,
   },
 });