Remove GSNv1 contracts (#2521)

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

test/utils/Context.test.js

@@ -0,0 +1,17 @@
+require('@openzeppelin/test-helpers');
+
+const ContextMock = artifacts.require('ContextMock');
+const ContextMockCaller = artifacts.require('ContextMockCaller');
+
+const { shouldBehaveLikeRegularContext } = require('./Context.behavior');
+
+contract('Context', function (accounts) {
+  const [ sender ] = accounts;
+
+  beforeEach(async function () {
+    this.context = await ContextMock.new();
+    this.caller = await ContextMockCaller.new();
+  });
+
+  shouldBehaveLikeRegularContext(sender);
+});