feat: contracts endpoint (#123)

Author: alexbarnsley

src/API/Contracts.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ArkEcosystem\Client\API;
+
+class Contracts extends AbstractAPI
+{
+    /**
+     * Get all contracts.
+     *
+     * @return array
+     */
+    public function all(): ?array
+    {
+        return $this->requestGet('contracts');
+    }
+
+    /**
+     * Get the node syncing status.
+     *
+     * @return array
+     */
+    public function abi(string $name, string $implementation): ?array
+    {
+        return $this->requestGet(sprintf('contracts/%s/%s/abi', $name, $implementation));
+    }
+}

tests/API/ContractsTest.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ArkEcosystem\Tests\Client\API;
+
+use ArkEcosystem\Tests\Client\TestCase;
+
+/**
+ * @covers \ArkEcosystem\Client\API\Contracts
+ */
+class ContractsTest extends TestCase
+{
+    /** @test */
+    public function all_calls_correct_url()
+    {
+        $this->assertResponse('GET', 'contracts', function ($client) {
+            return $client->contracts()->all();
+        });
+    }
+
+    /** @test */
+    public function abi_calls_correct_url()
+    {
+        $this->assertResponse('GET', 'contracts/consensus/some-wallet/abi', function ($client) {
+            return $client->contracts()->abi('consensus', 'some-wallet');
+        });
+    }
+}