feat: cmd.mock stubs any command by default

Author: hasundue

README.md

@@ -27,6 +27,14 @@ cmd.mock();
 assert(Deno.Command !== Original);
 ```
 
+Stub any command by default:
+
+```typescript
+cmd.mock();
+await new Deno.Command("echo").output();
+assertNotRun("echo");
+```
+
 #### `use`
 
 Replace Deno.Command inside the callback:
@@ -69,10 +77,7 @@ Stub a command with the default dummy:
 ```typescript
 const echo = cmd.stub("echo");
 await cmd.use(() => new Deno.Command("echo").output());
-assertEquals(
-  Deno.permissions.querySync({ name: "run", command: "echo" }).state,
-  "prompt",
-);
+assertNotRun("echo");
 assertSpyCalls(echo, 1);
 ```
 

src/cmd.ts

@@ -75,6 +75,9 @@ const CommandProxy: typeof Deno.Command = new Proxy(CommandOriginal, {
     const [command, options] = args as ConstructorParameters<
       typeof Deno.Command
     >;
+    if (spies.size === 0) {
+      return new (stub(command))(command, options);
+    }
     const spy = spies.get(command.toString());
     if (spy) {
       return new spy(command, options);

src/cmd_test.ts

@@ -3,6 +3,13 @@ import { afterAll, afterEach, describe, it } from "@std/testing/bdd";
 import { assertSpyCalls } from "@std/testing/mock";
 import * as cmd from "./cmd.ts";
 
+function assertNotRun(command: string) {
+  assertEquals(
+    Deno.permissions.querySync({ name: "run", command }).state,
+    "prompt",
+  );
+}
+
 describe("mock", () => {
   const Original = Deno.Command;
 
@@ -14,6 +21,12 @@ describe("mock", () => {
     cmd.mock();
     assert(Deno.Command !== Original);
   });
+
+  it("should stub any command by default", async () => {
+    cmd.mock();
+    await new Deno.Command("echo").output();
+    assertNotRun("echo");
+  });
 });
 
 describe("use", () => {
@@ -53,10 +66,7 @@ describe("stub", () => {
   it("should stub a command with the default dummy", async () => {
     const echo = cmd.stub("echo");
     await cmd.use(() => new Deno.Command("echo").output());
-    assertEquals(
-      Deno.permissions.querySync({ name: "run", command: "echo" }).state,
-      "prompt",
-    );
+    assertNotRun("echo");
     assertSpyCalls(echo, 1);
   });