Replace caw with its tunnel-agent dependency

test/unit/agent.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const assert = require('assert');
+const agent = require('../../lib/agent');
+
+describe('HTTP agent', function () {
+  it('Without proxy', function () {
+    assert.strictEqual(null, agent());
+  });
+
+  it('HTTPS proxy with auth from HTTPS_PROXY', function () {
+    process.env.HTTPS_PROXY = 'https://user:pass@secure:123';
+    const proxy = agent();
+    delete process.env.HTTPS_PROXY;
+    assert.strictEqual('object', typeof proxy);
+    assert.strictEqual('secure', proxy.options.proxy.host);
+    assert.strictEqual(123, proxy.options.proxy.port);
+    assert.strictEqual('user:pass', proxy.options.proxy.proxyAuth);
+    assert.strictEqual(443, proxy.defaultPort);
+  });
+
+  it('HTTP proxy without auth from npm_config_proxy', function () {
+    process.env.npm_config_proxy = 'http://plaintext:456';
+    const proxy = agent();
+    delete process.env.npm_config_proxy;
+    assert.strictEqual('object', typeof proxy);
+    assert.strictEqual('plaintext', proxy.options.proxy.host);
+    assert.strictEqual(456, proxy.options.proxy.port);
+    assert.strictEqual(null, proxy.options.proxy.proxyAuth);
+    assert.strictEqual(443, proxy.defaultPort);
+  });
+});