test: add tests

tests_integration/__tests__/__snapshots__/early-exit.js.snap

@@ -58,6 +58,66 @@ Uncategorized options:
 "
 `;
 
+exports[`throw error and show usage with something unexpected 1`] = `
+"Usage: prettier [opts] [filename ...]
+
+Config options:
+
+  --config <path>          Path to a prettier configuration file (.prettierrc, package.json, prettier.config.js).
+  --config-precedence <cli-override|file-override|prefer-file>
+                           Defines how config file should be evaluated in combination of CLI options
+                           cli-override  | default config => config file => CLI options
+                           file-override | default config => CLI options => config file
+                           prefer-file   | default config => config file (if config file is found) or
+                                           default config => CLI options (if no config file is found)
+                           Defaults to cli-override
+  --find-config-path <path>
+                           Finds and prints the path to a configuration file for a given input file.
+  --ignore-path <path>     Path to a file containing patterns that describe files to ignore.
+                           Defaults to ./.prettierignore.
+  --no-config              Do not look for a configuration file.
+  --with-node-modules      Process files inside 'node_modules' directory.
+
+Format options:
+
+  --jsx-bracket-same-line  Put > on the last line instead of at a new line.
+  --no-bracket-spacing     Do not print spaces between brackets.
+  --no-semi                Do not print semicolons, except at the beginning of lines which may need them.
+  --parser <flow|babylon|typescript|postcss|json|graphql>
+                           Specify which parse to use. Defaults to babylon.
+  --print-width <int>      Specify the length of line that the printer will wrap on. Defaults to 80.
+  --range-end <int>        Format code ending at a given character offset (exclusive).
+                           The range will extend forwards to the end of the selected statement.
+                           This option cannot be used with --cursor-offset.
+                           Defaults to Infinity.
+  --range-start <int>      Format code starting at a given character offset.
+                           The range will extend backwards to the start of the first line containing the selected statement.
+                           This option cannot be used with --cursor-offset.
+                           Defaults to 0.
+  --single-quote           Use single quotes instead of double quotes.
+  --tab-width <int>        Specify the number of spaces per indentation-level. Defaults to 2.
+  --trailing-comma <none|es5|all>
+                           Print trailing commas wherever possible when multi-line. Defaults to none.
+  --use-tabs               Indent lines with tabs instead of spaces.
+
+Uncategorized options:
+
+  --cursor-offset <int>    Print (to stderr) where a cursor at the given position would move to after formatting.
+                           This option cannot be used with --range-start and --range-end
+  --help or -h             Show help.
+  --list-different or -l   Print filenames of files that are different from Prettier formatting.
+  --no-color               Do not colorize error messages.
+  --stdin                  Read input from stdin.
+  --stdin-filepath <path>  Path to the file used to read from stdin.
+  --version or -v          Print Prettier version.
+  --write                  Edit the file in-place. (Beware!)
+
+
+"
+`;
+
+exports[`throw error and show usage with something unexpected 2`] = `""`;
+
 exports[`throw error with --find-config-path + multiple files 1`] = `
 "Cannot use --find-config-path with multiple files
 "

tests_integration/__tests__/early-exit.js

@@ -30,3 +30,11 @@ test("throw error with --find-config-path + multiple files", () => {
   expect(result.stderr).toMatchSnapshot();
   expect(result.status).toEqual(1);
 });
+
+test("throw error and show usage with something unexpected", () => {
+  const result = runPrettier("cli", [], { isTTY: true });
+
+  expect(result.stdout).toMatchSnapshot();
+  expect(result.stderr).toMatchSnapshot();
+  expect(result.status).not.toEqual(0);
+});

tests_integration/runPrettier.js

@@ -4,6 +4,9 @@ const fs = require("fs");
 const path = require("path");
 
 function runPrettier(dir, args, options) {
+  args = args || [];
+  options = options || {};
+
   let status;
   let stdout = "";
   let stderr = "";
@@ -43,12 +46,12 @@ function runPrettier(dir, args, options) {
   const originalStdinIsTTY = process.stdin.isTTY;
 
   process.chdir(normalizeDir(dir));
-  process.stdin.isTTY = false;
-  process.argv = ["path/to/node", "path/to/prettier/bin"].concat(args || []);
+  process.stdin.isTTY = !!options.isTTY;
+  process.argv = ["path/to/node", "path/to/prettier/bin"].concat(args);
 
   jest.resetModules();
   jest.setMock("get-stream", () => ({
-    then: handler => handler((options && options.input) || "")
+    then: handler => handler(options.input || "")
   }));
 
   try {