CLI: Skip print code or write file when performance flags found (#12682)

tests/integration/__tests__/performance-flags.js

@@ -0,0 +1,63 @@
+"use strict";
+
+const runPrettier = require("../run-prettier.js");
+
+describe("should not write file or print code when `--debug-benchmark` or `--debug-repeat` found", () => {
+  // Can't test `--debug-benchmark`, since it requires `benchmark` package
+  runPrettier(
+    "cli/performance-flags",
+    ["--debug-repeat", "2", "--parser", "babel"],
+    {
+      input: "foo(    bar    )",
+    }
+  ).test({
+    stderr: "",
+    status: 0,
+    stdout: "'--debug-repeat' option found, skipped print code to screen.\n",
+    write: [],
+  });
+
+  runPrettier("cli/performance-flags", [
+    "fixture.js",
+    "--debug-repeat",
+    "2",
+    "--parser",
+    "babel",
+  ]).test({
+    stderr: "",
+    status: 0,
+    stdout:
+      "'--debug-repeat' option found, skipped print code or write files.\n",
+    write: [],
+  });
+
+  runPrettier("cli/performance-flags", [
+    "fixture.js",
+    "--debug-repeat",
+    "2",
+    "--parser",
+    "babel",
+    "--write",
+  ]).test({
+    stderr: "",
+    status: 0,
+    stdout:
+      "'--debug-repeat' option found, skipped print code or write files.\n",
+    write: [],
+  });
+
+  runPrettier("cli/performance-flags", [
+    "fixture.js",
+    "--debug-repeat",
+    "2",
+    "--parser",
+    "babel",
+    "--check",
+  ]).test({
+    stderr: "",
+    status: 0,
+    stdout:
+      "'--debug-repeat' option found, skipped print code or write files.\n",
+    write: [],
+  });
+});

tests/integration/cli/performance-flags/fixture.js

@@ -0,0 +1 @@
+foo(    bar    )