Remove GSNv1 contracts (#2521)

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

test/utils/Context.behavior.js

@@ -0,0 +1,42 @@
+const { BN, expectEvent } = require('@openzeppelin/test-helpers');
+
+const ContextMock = artifacts.require('ContextMock');
+
+function shouldBehaveLikeRegularContext (sender) {
+  describe('msgSender', function () {
+    it('returns the transaction sender when called from an EOA', async function () {
+      const { logs } = await this.context.msgSender({ from: sender });
+      expectEvent.inLogs(logs, 'Sender', { sender });
+    });
+
+    it('returns the transaction sender when from another contract', async function () {
+      const { tx } = await this.caller.callSender(this.context.address, { from: sender });
+      await expectEvent.inTransaction(tx, ContextMock, 'Sender', { sender: this.caller.address });
+    });
+  });
+
+  describe('msgData', function () {
+    const integerValue = new BN('42');
+    const stringValue = 'OpenZeppelin';
+
+    let callData;
+
+    beforeEach(async function () {
+      callData = this.context.contract.methods.msgData(integerValue.toString(), stringValue).encodeABI();
+    });
+
+    it('returns the transaction data when called from an EOA', async function () {
+      const { logs } = await this.context.msgData(integerValue, stringValue);
+      expectEvent.inLogs(logs, 'Data', { data: callData, integerValue, stringValue });
+    });
+
+    it('returns the transaction sender when from another contract', async function () {
+      const { tx } = await this.caller.callData(this.context.address, integerValue, stringValue);
+      await expectEvent.inTransaction(tx, ContextMock, 'Data', { data: callData, integerValue, stringValue });
+    });
+  });
+}
+
+module.exports = {
+  shouldBehaveLikeRegularContext,
+};