test: add tests for `--stdin-filepath`

tests_integration/__tests__/__snapshots__/stdin-filepath.js.snap

@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`format correctly if stdin content compatible with stdin-filepath 1`] = `
+".name {
+  display: none;
+}
+"
+`;
+
+exports[`format correctly if stdin content compatible with stdin-filepath 2`] = `""`;
+
+exports[`throw error if stdin content incompatible with stdin-filepath 1`] = `""`;
+
+exports[`throw error if stdin content incompatible with stdin-filepath 2`] = `
+"stdin: SyntaxError: Unexpected token (1:1)
+> 1 | .name { display: none; }
+    | ^
+"
+`;

tests_integration/__tests__/stdin-filepath.js

@@ -0,0 +1,27 @@
+"use strict";
+
+const runPrettier = require("../runPrettier");
+
+test("format correctly if stdin content compatible with stdin-filepath", () => {
+  const result = runPrettier(
+    "cli",
+    ["--no-color", "--stdin-filepath", "abc.css"],
+    { input: ".name { display: none; }" } // css
+  );
+
+  expect(result.stdout).toMatchSnapshot();
+  expect(result.stderr).toMatchSnapshot();
+  expect(result.status).toEqual(0);
+});
+
+test("throw error if stdin content incompatible with stdin-filepath", () => {
+  const result = runPrettier(
+    "cli",
+    ["--no-color", "--stdin-filepath", "abc.js"],
+    { input: ".name { display: none; }" } // css
+  );
+
+  expect(result.stdout).toMatchSnapshot();
+  expect(result.stderr).toMatchSnapshot();
+  expect(result.status).not.toEqual(0);
+});