test: add missing test cases

Co-authored-by: imdudu1 <cd80@kakao.com>

Author: jbl428

lib/builders/request-form.builder.spec.ts

@@ -14,6 +14,18 @@ describe('RequestFormBuilder', () => {
     expect([...actual.entries()]).toEqual([['keyword', 'search']]);
   });
 
+  test('should ignore null value in args', () => {
+    // given
+    const builder = new RequestFormBuilder(0, 'keyword');
+    const args = [null];
+
+    // when
+    const actual = builder.build(args);
+
+    // then
+    expect([...actual.entries()]).toEqual([['keyword', '']]);
+  });
+
   test('should build form data with explicit key and default', () => {
     // given
     const builder = new RequestFormBuilder(0, 'keyword', 'search');

lib/builders/request-header.builder.spec.ts

@@ -17,6 +17,21 @@ describe('RequestHeaderBuilder', () => {
     expect(actual).toEqual({ keyword: 'search' });
   });
 
+  test('should ignore null value in args', () => {
+    // given
+    const builder = new RequestHeaderBuilder({
+      parameterIndex: 0,
+      key: 'keyword',
+    });
+    const args = [null];
+
+    // when
+    const actual = builder.build(args);
+
+    // then
+    expect(actual).toEqual({ keyword: '' });
+  });
+
   test('should build header with explicit key and default', () => {
     // given
     const builder = new RequestHeaderBuilder({

lib/builders/request-param.builder.spec.ts

@@ -14,6 +14,18 @@ describe('RequestParamBuilder', () => {
     expect(actual).toBe('?keyword=search');
   });
 
+  test('should ignore null value in args', () => {
+    // given
+    const builder = new RequestParamBuilder(0, 'keyword');
+    const args = [null];
+
+    // when
+    const actual = builder.build(args);
+
+    // then
+    expect(actual).toBe('?keyword=');
+  });
+
   test('should build query string with explicit key and default', () => {
     // given
     const builder = new RequestParamBuilder(0, 'keyword', 'default');