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diff --git a/‎.github/workflows/test.yml
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diff --git a/‎README.md
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diff --git a/‎__tests__/main.test.ts
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+82Lines changed: 82 additions & 0 deletions b/‎__tests__/main.test.ts
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+name: Test Action
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      matrix:
+        operating-system: [ubuntu-latest, windows-latest]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Set Node.js 10.x
+        uses: actions/setup-node@1.2.0
+        with:
+          node-version: 10.x
+
+      - name: npm install
+        working-directory: ./setup-arduino-cli
+        run: npm install
+
+      - name: npm lint
+        working-directory: ./setup-arduino-cli
+        run: npm run format-check
+
+      - name: npm test
+        working-directory: ./setup-arduino-cli
+        run: npm test
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+# setup-arduino-cli
+
+This action makes the `arduino-cli` tool available to Workflows.
+
+## Usage
+
+To get the latest stable version of `arduino-cli` just add this step:
+
+```yaml
+- name: Install Arduino CLI
+  uses: Arduino/actions/setup-arduino-cli@master
+```
+
+If you want to pin a major or minor version you can use the `.x` wildcard:
+
+```yaml
+- name: Install Arduino CLI
+  uses: Arduino/actions/setup-arduino-cli@master
+  with:
+    version: '0.x'
+```
+
+To pin the exact version:
+
+```yaml
+- name: Install Arduino CLI
+  uses: Arduino/actions/setup-arduino-cli@master
+  with:
+    version: '0.5.0'
+```
+
+## Development
+
+To work on the codebase you have to install all the dependencies:
+
+```sh
+# npm install
+```
+
+To run the tests:
+
+```sh
+# npm run test
+```
+
+## Release
+
+We check in the `node_modules` to provide runtime dependencies to the system
+using the Action, so be careful not to `git add` all the development dependencies
+you might have under your local `node_modules`. To release a new version of the
+Action the workflow should be the following:
+
+1. `npm install` to add all the dependencies, included development.
+1. `npm run test` to see everything works as expected.
+1. `npm build` to build the Action under the `./lib` folder.
+1. `rm -rf node_modules` to remove all the dependencies.
+1. `npm install --production` to add back **only** the runtime dependencies.
+1. `git add lib node_modules` to check in the code that matters.
+1. open a PR and request a review.
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+import io = require("@actions/io");
+import path = require("path");
+import os = require("os");
+import fs = require("fs");
+import nock = require("nock");
+
+const toolDir = path.join(__dirname, "runner", "tools");
+const tempDir = path.join(__dirname, "runner", "temp");
+const dataDir = path.join(__dirname, "testdata");
+const IS_WINDOWS = process.platform === "win32";
+
+process.env["RUNNER_TEMP"] = tempDir;
+process.env["RUNNER_TOOL_CACHE"] = toolDir;
+import * as installer from "../src/installer";
+
+describe("installer tests", () => {
+  beforeEach(async function() {
+    await io.rmRF(toolDir);
+    await io.rmRF(tempDir);
+    await io.mkdirP(toolDir);
+    await io.mkdirP(tempDir);
+  });
+
+  afterAll(async () => {
+    try {
+      await io.rmRF(toolDir);
+      await io.rmRF(tempDir);
+    } catch {
+      console.log("Failed to remove test directories");
+    }
+  });
+
+  it("Downloads version of Arduino CLI if no matching version is installed", async () => {
+    await installer.getArduinoCli("0.4.0");
+    const bindir = path.join(toolDir, "arduino-cli", "0.4.0", os.arch());
+
+    expect(fs.existsSync(`${bindir}.complete`)).toBe(true);
+
+    if (IS_WINDOWS) {
+      expect(fs.existsSync(path.join(bindir, "arduino-cli.exe"))).toBe(true);
+    } else {
+      expect(fs.existsSync(path.join(bindir, "arduino-cli"))).toBe(true);
+    }
+  }, 10000);
+
+  describe("Gets the latest release of Arduino CLI", () => {
+    beforeEach(() => {
+      nock("https://api.github.com")
+        .get("/repos/Arduino/arduino-cli/git/refs/tags")
+        .replyWithFile(200, path.join(dataDir, "tags.json"));
+    });
+
+    afterEach(() => {
+      nock.cleanAll();
+      nock.enableNetConnect();
+    });
+
+    it("Gets the latest version of Arduino CLI 0.4.0 using 0.4 and no matching version is installed", async () => {
+      await installer.getArduinoCli("0.4");
+      const bindir = path.join(toolDir, "arduino-cli", "0.4.0", os.arch());
+
+      expect(fs.existsSync(`${bindir}.complete`)).toBe(true);
+      if (IS_WINDOWS) {
+        expect(fs.existsSync(path.join(bindir, "arduino-cli.exe"))).toBe(true);
+      } else {
+        expect(fs.existsSync(path.join(bindir, "arduino-cli"))).toBe(true);
+      }
+    }, 10000);
+
+    it("Gets latest version of Task using 0.x and no matching version is installed", async () => {
+      await installer.getArduinoCli("0.x");
+      const bindir = path.join(toolDir, "arduino-cli", "0.5.0", os.arch());
+
+      expect(fs.existsSync(`${bindir}.complete`)).toBe(true);
+      if (IS_WINDOWS) {
+        expect(fs.existsSync(path.join(bindir, "arduino-cli.exe"))).toBe(true);
+      } else {
+        expect(fs.existsSync(path.join(bindir, "arduino-cli"))).toBe(true);
+      }
+    }, 10000);
+  });
+});