add directive tests

Author: samisuteria

Tests/GraphitiTests/DirectiveTests/DirectiveTests.swift

@@ -0,0 +1,77 @@
+@testable import Graphiti
+import GraphQL
+import NIO
+import XCTest
+
+class DirectiveTests: XCTestCase {
+    private let api = StarWarsAPI()
+    private var group = MultiThreadedEventLoopGroup(numberOfThreads: System.coreCount)
+
+    deinit {
+        try? self.group.syncShutdownGracefully()
+    }
+
+    func testSkip() async throws {
+        let query = """
+        query FetchHeroNameWithSkip($skipName: Boolean!) {
+            hero {
+                id
+                name @skip(if: $skipName)
+            }
+        }
+        """
+
+        let input: [String: Map] = [
+            "skipName": true
+        ]
+
+        let response = try await api.execute(
+            request: query,
+            context: StarWarsContext(),
+            on: group,
+            variables: input
+        )
+
+        let expected = GraphQLResult(
+            data: [
+                "hero": [
+                    "id": "2001"
+                ],
+            ]
+        )
+
+        XCTAssertEqual(response, expected)
+    }
+
+    func testInclude() async throws {
+        let query = """
+        query FetchHeroNameWithSkip($includeName: Boolean!) {
+            hero {
+                id
+                name @include(if: $includeName)
+            }
+        }
+        """
+
+        let input: [String: Map] = [
+            "includeName": false
+        ]
+
+        let response = try await api.execute(
+            request: query,
+            context: StarWarsContext(),
+            on: group,
+            variables: input
+        )
+
+        let expected = GraphQLResult(
+            data: [
+                "hero": [
+                    "id": "2001"
+                ],
+            ]
+        )
+
+        XCTAssertEqual(response, expected)
+    }
+}