test: add ignore-emoji tests

test/__fixtures__/ignore-emoji/.prettierignore

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+ignored

test/__fixtures__/ignore-emoji/ignored/1.js

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+const foo
+=         'bar'
+;

test/__fixtures__/ignore-emoji/ignored/中文.js

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+const foo
+=         'bar'
+;

test/__fixtures__/ignore-emoji/ignored/😁.js

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+const foo
+=         'bar'
+;

test/__fixtures__/ignore-emoji/not-ignored.js

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+const foo
+=         'bar'
+;

test/__tests__/__snapshots__/ignore-emoji.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`ignores file name contains emoji (stderr) 1`] = `""`;
+
+exports[`ignores file name contains emoji (stdout) 1`] = `"not-ignored.js"`;
+
+exports[`ignores file name contains emoji (write) 1`] = `[]`;
+
+exports[`stdin (stderr) 1`] = `""`;
+
+exports[`stdin (stdout) 1`] = `".name {                         display: none; }"`;
+
+exports[`stdin (write) 1`] = `[]`;

test/__tests__/ignore-emoji.js

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+import { runCli } from "../utils";
+
+describe("ignores file name contains emoji", () => {
+  runCli("ignore-emoji", ["**/*.js", "-l"]).test({
+    status: 1,
+  });
+});
+
+// TODO (43081j): re-enable once we fix #21
+describe.skip("stdin", () => {
+  runCli("ignore-emoji", ["--stdin-filepath", "ignored/我的样式.css"], {
+    input: ".name {                         display: none; }",
+  }).test({
+    status: 0,
+  });
+});