diff --git a/.travis.yml b/.travis.yml
index 00f03cf0c3..966481510e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,14 +16,12 @@ script:
   - touch ./ts-docs/.nojekyll
   - if [ "$TRAVIS_NODE_VERSION" = "8" ]; then npm run coveralls-report; fi
 deploy:
-  - provider: pages
+  - provider: script
     skip_cleanup: true
-    local_dir: ts-docs
-    keep_history: true
-    github_token: $GITHUB_TOKEN
+    script: /bin/sh travis/github-pages.sh
     on:
       branch: master
-      node_js: "8"
+      node_js: "9"
   - provider: script
     skip_cleanup: true
     script: /bin/sh travis/uploadArchives.sh
diff --git a/src/infrastructure/ChainHttp.ts b/src/infrastructure/ChainHttp.ts
index afbbffcc1b..feed73768a 100644
--- a/src/infrastructure/ChainHttp.ts
+++ b/src/infrastructure/ChainHttp.ts
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import { from as observableFrom, Observable, throwError } from 'rxjs';
-import { catchError, map } from 'rxjs/operators';
+import { Observable } from 'rxjs';
 import { ChainRoutesApi } from 'symbol-openapi-typescript-node-client';
 import { BlockchainScore } from '../model/blockchain/BlockchainScore';
 import { UInt64 } from '../model/UInt64';
@@ -48,10 +47,7 @@ export class ChainHttp extends Http implements ChainRepository {
      * @returns Observable<UInt64>
      */
     public getBlockchainHeight(): Observable<UInt64> {
-        return observableFrom(this.chainRoutesApi.getChainHeight()).pipe(
-            map(({body}) => UInt64.fromNumericString(body.height)),
-            catchError((error) =>  throwError(this.errorHandling(error))),
-        );
+        return this.call(this.chainRoutesApi.getChainHeight(), (body) => UInt64.fromNumericString(body.height));
     }
 
     /**
@@ -59,12 +55,10 @@ export class ChainHttp extends Http implements ChainRepository {
      * @returns Observable<BlockchainScore>
      */
     public getChainScore(): Observable<BlockchainScore> {
-        return observableFrom(this.chainRoutesApi.getChainScore()).pipe(
-            map(({body}) => new BlockchainScore(
-                    UInt64.fromNumericString(body.scoreLow),
-                    UInt64.fromNumericString(body.scoreHigh),
-                )),
-            catchError((error) =>  throwError(this.errorHandling(error))),
+        return this.call(this.chainRoutesApi.getChainScore(), (body) => new BlockchainScore(
+            UInt64.fromNumericString(body.scoreLow),
+            UInt64.fromNumericString(body.scoreHigh),
+            ),
         );
     }
 }
diff --git a/test/infrastructure/ChainHttp.spec.ts b/test/infrastructure/ChainHttp.spec.ts
new file mode 100644
index 0000000000..502e39869b
--- /dev/null
+++ b/test/infrastructure/ChainHttp.spec.ts
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2020 NEM
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { expect } from 'chai';
+import * as http from 'http';
+import { ChainRoutesApi, ChainScoreDTO, HeightInfoDTO, } from 'symbol-openapi-typescript-node-client';
+import { instance, mock, reset, when } from 'ts-mockito';
+import { DtoMapping } from '../../src/core/utils/DtoMapping';
+import { ChainHttp } from '../../src/infrastructure/ChainHttp';
+import { ChainRepository } from '../../src/infrastructure/ChainRepository';
+
+describe('ChainHttp', () => {
+
+    const url = 'http://someHost';
+    const response: http.IncomingMessage = mock();
+    const chainRoutesApi: ChainRoutesApi = mock();
+    const chainRepository: ChainRepository = DtoMapping.assign(new ChainHttp(url), {chainRoutesApi: instance(chainRoutesApi)});
+
+    before(() => {
+        reset(response);
+        reset(chainRoutesApi);
+    });
+
+    it('getBlockchainHeight', async () => {
+        const heightInfoDTO = new HeightInfoDTO();
+        heightInfoDTO.height = '3';
+        when(chainRoutesApi.getChainHeight()).thenReturn(Promise.resolve({response, body: heightInfoDTO}));
+        const heightInfo = await chainRepository.getBlockchainHeight().toPromise();
+        expect(heightInfo).to.be.not.null;
+        expect(heightInfo.toString()).to.be.equals('3');
+    });
+
+    it('getChainScore', async () => {
+        const chainScoreDTO = new ChainScoreDTO();
+        chainScoreDTO.scoreLow = '2';
+        chainScoreDTO.scoreHigh = '3';
+        when(chainRoutesApi.getChainScore()).thenReturn(Promise.resolve({response, body: chainScoreDTO}));
+        const chainScore = await chainRepository.getChainScore().toPromise();
+        expect(chainScore).to.be.not.null;
+        expect(chainScore.scoreLow.toString()).to.be.equals('2');
+        expect(chainScore.scoreHigh.toString()).to.be.equals('3');
+    });
+
+});
diff --git a/travis/github-pages.sh b/travis/github-pages.sh
new file mode 100644
index 0000000000..a3e78de3d5
--- /dev/null
+++ b/travis/github-pages.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -e
+
+PUBLICATION_BRANCH=gh-pages
+# Checkout the branch
+REPO_PATH=$PWD
+CURRENT_VERSION=$(npm run version --silent)
+rm -rf $HOME/publish
+cd $HOME
+git clone --branch=$PUBLICATION_BRANCH    https://${GITHUB_TOKEN}@github.com/$TRAVIS_REPO_SLUG publish 2>&1 > /dev/null
+cd publish
+# Update pages
+
+cp -r $REPO_PATH/ts-docs/. ./
+# Commit and push latest version
+git add .
+git config user.name  "Travis"
+git config user.email "travis@travis-ci.org"
+git commit -m "Uploading $CURRENT_VERSION docs."
+git push -fq origin $PUBLICATION_BRANCH 2>&1 > /dev/null
+cd $REPO_PATH