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node_modules/node-sass/test/scripts/util/proxy.js

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+var assert = require('assert').strict,
+  proxy = require('../../../scripts/util/proxy');
+
+describe('proxy', function() {
+  var oldEnvironment;
+
+  beforeEach(function() {
+    oldEnvironment = process.env;
+  });
+
+  afterEach(function() {
+    process.env = oldEnvironment;
+  });
+
+  describe('without an npm proxy config', function() {
+    delete process.env.npm_config_https_proxy;
+    delete process.env.npm_config_proxy;
+    delete process.env.npm_config_http_proxy;
+
+    it('should return an empty string', function() {
+      assert.strictEqual('', proxy());
+    });
+
+    it('should ignore system proxy environment variables', function() {
+      process.env.HTTPS_PROXY = 'http://https_proxy.com';
+      process.env.PROXY = 'http://proxy.com';
+      process.env.HTTP_PROXY = 'http://http_proxy.com';
+
+      assert.strictEqual('', proxy());
+    });
+  });
+
+  describe('with an npm proxy config', function() {
+    beforeEach(function() {
+      process.env.npm_config_https_proxy = 'http://https_proxy.com';
+      process.env.npm_config_proxy = 'http://proxy.com';
+      process.env.npm_config_http_proxy = 'http://http_proxy.com';
+    });
+
+    describe('https_proxy', function() {
+      it('should have the highest precedence', function() {
+        assert.strictEqual(process.env.npm_config_https_proxy, proxy());
+      });
+    });
+
+    describe('proxy', function() {
+      it('should have the higher precedence than https_proxy', function() {
+        assert.strictEqual(process.env.npm_config_https_proxy, proxy());
+        delete process.env.npm_config_https_proxy;
+
+        assert.strictEqual(process.env.npm_config_proxy, proxy());
+      });
+
+      it('should have the lower precedence than http_proxy', function() {
+        delete process.env.npm_config_https_proxy;
+
+        assert.strictEqual(process.env.npm_config_proxy, proxy());
+        delete process.env.npm_config_proxy;
+
+        assert.strictEqual(process.env.npm_config_http_proxy, proxy());
+      });
+    });
+
+    describe('http_proxy', function() {
+      it('should have the lowest precedence', function() {
+        assert.strictEqual(process.env.npm_config_https_proxy, proxy());
+        delete process.env.npm_config_https_proxy;
+
+        assert.strictEqual(process.env.npm_config_proxy, proxy());
+        delete process.env.npm_config_proxy;
+
+        assert.strictEqual(process.env.npm_config_http_proxy, proxy());
+      });
+    });
+  });
+});