Add more tests (#8)

tests/RequestDefinitionBuilder.test.ts

@@ -1,5 +1,5 @@
 import { RequestDefinitionBuilder } from '../src/RequestDefinitionBuilder';
-import { Item, ItemGroup, Collection, Url } from 'postman-collection';
+import { Item, ItemGroup, Collection, Url, Header, RequestBody } from 'postman-collection';
 import { readFileSync } from 'fs';
 
 describe('Request Definition Builder', () => {
@@ -21,4 +21,52 @@ describe('Request Definition Builder', () => {
 
         expect(actual).toBe('\n\nGET host.com/\n    ?color=red');
     });
+
+    test('Header is added', () => {
+        getRequest.request.headers.clear();
+        const header = new Header('option');
+        header.key = 'SomeHeader';
+        header.value = 'SomeValue';
+        getRequest.request.headers.add(header);
+
+        const target = new RequestDefinitionBuilder()
+            .from(getRequest)
+            .appendHeaders();
+
+        const actual = target.toString();
+
+        expect(actual).toBe('\nSomeHeader: SomeValue');
+    });
+
+    test('Multiple headers are added', () => {
+        getRequest.request.headers.clear();
+        const header1 = new Header('option');
+        header1.key = 'SomeHeader1';
+        header1.value = 'SomeValue1';
+        getRequest.request.headers.add(header1);
+        const header2 = new Header('option');
+        header2.key = 'SomeHeader2';
+        header2.value = 'SomeValue2';
+        getRequest.request.headers.add(header2);
+
+        const target = new RequestDefinitionBuilder()
+            .from(getRequest)
+            .appendHeaders();
+
+        const actual = target.toString();
+
+        expect(actual).toBe('\nSomeHeader1: SomeValue1\nSomeHeader2: SomeValue2');
+    });
+
+    test('Body is added with default content-type header', () => {
+        getRequest.request.body = new RequestBody({ mode: 'json', raw: '{ "some": "value" }' });
+
+        const target = new RequestDefinitionBuilder()
+            .from(getRequest)
+            .appendBody();
+
+        const actual = target.toString();
+
+        expect(actual).toBe('\nContent-Type: application/json\n\n{ "some": "value" }');
+    });
 });