Ported test suite: check

test/__tests__/__snapshots__/check.js.snap

@@ -0,0 +1,33 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`--checks should print the number of files that need formatting (stderr) 1`] = `
+"[warn] unformatted.js
+[warn] unformatted2.js
+[warn] Code style issues found in 2 files. Run Prettier with --write to fix."
+`;
+
+exports[`--checks should print the number of files that need formatting (stdout) 1`] = `"Checking formatting..."`;
+
+exports[`--checks should print the number of files that need formatting (write) 1`] = `[]`;
+
+exports[`--checks works in CI just as in a non-TTY mode (stderr) 1`] = `
+"[warn] unformatted.js
+[warn] Code style issues found in 1 file. Run Prettier with --write to fix."
+`;
+
+exports[`--checks works in CI just as in a non-TTY mode (stderr) 2`] = `
+"[warn] unformatted.js
+[warn] Code style issues found in 1 file. Run Prettier with --write to fix."
+`;
+
+exports[`--checks works in CI just as in a non-TTY mode (stdout) 1`] = `"Checking formatting..."`;
+
+exports[`--checks works in CI just as in a non-TTY mode (stdout) 2`] = `"Checking formatting..."`;
+
+exports[`--checks works in CI just as in a non-TTY mode (write) 1`] = `[]`;
+
+exports[`--checks works in CI just as in a non-TTY mode (write) 2`] = `[]`;
+
+exports[`checks stdin with --check (write) 1`] = `[]`;
+
+exports[`checks stdin with -c (alias for --check) (write) 1`] = `[]`;

test/__tests__/check.js

@@ -0,0 +1,65 @@
+import { runCli } from "../utils";
+
+describe("checks stdin with --check", () => {
+  runCli("with-shebang", [
+    "--check",
+    "--parser",
+    "babel",
+  ], {
+    input: "0",
+  }).test({
+    stdout: "(stdin)",
+    stderr: "",
+    status: "non-zero",
+  });
+});
+
+describe("checks stdin with -c (alias for --check)", () => {
+  runCli("with-shebang", [
+    "-c",
+    "--parser",
+    "babel",
+  ], {
+    input: "0",
+  }).test({
+    stdout: "(stdin)",
+    stderr: "",
+    status: "non-zero",
+  });
+});
+
+describe("--checks works in CI just as in a non-TTY mode", () => {
+  const result0 = runCli("write", [
+    "--check",
+    "formatted.js",
+    "unformatted.js",
+  ]).test({
+    status: 1,
+  });
+
+  const result1 = runCli("write", [
+    "--check",
+    "formatted.js",
+    "unformatted.js",
+  ], {
+    tty: false, //TODO: actually implement this, read .isTTY via a env-mockable module
+  }).test({
+    status: 1,
+  });
+
+  test("Should have same stdout", async () => {
+    expect(await result0.stdout).toEqual(await result1.stdout);
+  });
+});
+
+describe("--checks should print the number of files that need formatting", () => {
+  runCli("write", [
+    "--check",
+    "unformatted.js",
+    "unformatted2.js",
+  ], {
+    input: "0",
+  }).test({
+    status: 1,
+  });
+});