test: add test for args (#160)

Author: Barbapapazes

src/types.ts

@@ -24,7 +24,7 @@ export type BooleanArgDef = Omit<_ArgDef<"boolean", boolean>, "options"> & {
   negativeDescription?: string;
 };
 export type StringArgDef = Omit<_ArgDef<"string", string>, "options">;
-export type NumberArgDef = Omit<_ArgDef<"number", boolean>, "options">;
+export type NumberArgDef = Omit<_ArgDef<"number", number>, "options">;
 export type EnumArgDef = _ArgDef<"enum", string>;
 export type PositionalArgDef = Omit<
   _ArgDef<"positional", string>,

test/args.test.ts

@@ -0,0 +1,139 @@
+import { describe, it, expect } from "vitest";
+import { parseArgs } from "../src/args";
+import { ArgsDef, ParsedArgs } from "../src";
+
+describe("args", () => {
+  it.each<[string[], ArgsDef, ParsedArgs]>([
+    [[], {}, { _: [] }],
+    /**
+     * String
+     */
+    [["--name", "John"], { name: { type: "string" } }, { name: "John", _: [] }],
+    [
+      [],
+      { name: { type: "string", default: "John" } },
+      { name: "John", _: [] },
+    ],
+    [
+      ["--name", "Jane"],
+      { name: { type: "string", default: "John" } },
+      { name: "Jane", _: [] },
+    ],
+    [
+      ["-n", "Jane"],
+      { name: { type: "string", alias: "n" } },
+      { name: "Jane", n: "Jane", _: [] },
+    ],
+    /**
+     * Number
+     */
+    [["--age", "25"], { age: { type: "number" } }, { age: 25, _: [] }],
+    [[], { age: { type: "number", default: 25 } }, { age: 25, _: [] }],
+    [
+      ["--age", "30"],
+      { age: { type: "number", default: 25 } },
+      { age: 30, _: [] },
+    ],
+    [
+      ["-a", "30"],
+      { age: { type: "number", alias: "a" } },
+      { age: 30, a: "30", _: [] },
+    ],
+    /**
+     * Boolean
+     */
+    [["--force"], { force: { type: "boolean" } }, { force: true, _: [] }],
+    [
+      ["-f"],
+      { force: { alias: "f", type: "boolean" } },
+      { force: true, f: true, _: [] },
+    ],
+    [[], { force: { type: "boolean", default: true } }, { force: true, _: [] }],
+    [
+      ["--no-force"],
+      { force: { type: "boolean", negativeDescription: "force" } },
+      { force: false, _: [] },
+    ],
+    /**
+     * Positional
+     */
+    [
+      ["subCommand"],
+      { command: { type: "positional" } },
+      { _: ["subCommand"], command: "subCommand" },
+    ],
+    [
+      [],
+      { command: { type: "positional", default: "subCommand" } },
+      { _: [], command: "subCommand" },
+    ],
+    [[], { command: { type: "positional", required: false } }, { _: [] }],
+    /**
+     * Enum
+     */
+    [
+      ["--value", "one"],
+      { value: { type: "enum", options: ["one", "two"] } },
+      { value: "one", _: [] },
+    ],
+  ])("should parsed correctly %o (%o)", (rawArgs, definition, result) => {
+    const parsed = parseArgs(rawArgs, definition);
+
+    expect(parsed).toEqual(result);
+  });
+
+  it.each<[string[], ArgsDef, string]>([
+    [
+      [],
+      { name: { type: "string", required: true } },
+      "Missing required argument: --name",
+    ],
+    [
+      ["--age", "twenty-five"],
+      { age: { type: "number" } },
+      "Invalid value for argument: `--age` (`twenty-five`). Expected a number.",
+    ],
+    [
+      [],
+      {
+        name: { type: "positional" },
+      },
+      "Missing required positional argument: NAME",
+    ],
+    [
+      ["--value", "three"],
+      { value: { type: "enum", options: ["one", "two"] } },
+      "Invalid value for argument: `--value` (`three`). Expected one of: `one`, `two`.",
+    ],
+  ])("should throw error with %o (%o)", (rawArgs, definition, result) => {
+    // TODO: should check for exact match
+    // https://github.com/vitest-dev/vitest/discussions/6048
+    expect(() => {
+      parseArgs(rawArgs, definition);
+    }).toThrowError(result);
+  });
+
+  it("should resolve camelCase argument", () => {
+    const definition: ArgsDef = {
+      "user-name": { type: "string" },
+    };
+    const rawArgs = ["--userName", "Jane"];
+
+    const parsed = parseArgs(rawArgs, definition);
+
+    expect(parsed["user-name"]).toBe("Jane");
+    expect(parsed._).toEqual([]);
+  });
+
+  it("should resolve kebab-case argument", () => {
+    const definition: ArgsDef = {
+      userName: { type: "string" },
+    };
+    const rawArgs = ["--user-name", "Jane"];
+
+    const parsed = parseArgs(rawArgs, definition);
+
+    expect(parsed.userName).toBe("Jane");
+    expect(parsed._).toEqual([]);
+  });
+});