diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..fdbe1eb
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,23 @@
+language: node_js
+
+sudo: false
+
+notifications:
+  email: false
+
+git:
+  depth: 1
+
+node_js:
+  - '10'
+
+before_install:
+  - cd server
+  - npm update
+
+install:
+  - npm install
+
+script:
+  - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then bash ../travis/run_on_pull_requests.sh; fi'
+  - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash ../travis/run_on_non_pull_requests.sh; fi'
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 4b78d9a..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,501 +0,0 @@
-{
-  "requires": true,
-  "lockfileVersion": 1,
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-      "resolved": "https://registry.npmjs.org/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz",
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-      "dev": true
-    },
-    "argparse": {
-      "version": "1.0.10",
-      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
-      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
-      "dev": true,
-      "requires": {
-        "sprintf-js": "~1.0.2"
-      }
-    },
-    "caller-callsite": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/caller-callsite/-/caller-callsite-2.0.0.tgz",
-      "integrity": "sha1-hH4PzgoiN1CpoCfFSzNzGtMVQTQ=",
-      "dev": true,
-      "requires": {
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-      }
-    },
-    "caller-path": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-2.0.0.tgz",
-      "integrity": "sha1-Ro+DBE42mrIBD6xfBs7uFbsssfQ=",
-      "dev": true,
-      "requires": {
-        "caller-callsite": "^2.0.0"
-      }
-    },
-    "callsites": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/callsites/-/callsites-2.0.0.tgz",
-      "integrity": "sha1-BuuE8A7qQT2oav/vrL/7Ngk7PFA=",
-      "dev": true
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-    "ci-info": {
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-      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
-      "integrity": "sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==",
-      "dev": true
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-    "cosmiconfig": {
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-      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.2.1.tgz",
-      "integrity": "sha512-H65gsXo1SKjf8zmrJ67eJk8aIRKV5ff2D4uKZIBZShbhGSpEmsQOPW/SKMKYhSTrqR7ufy6RP69rPogdaPh/kA==",
-      "dev": true,
-      "requires": {
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-        "is-directory": "^0.3.1",
-        "js-yaml": "^3.13.1",
-        "parse-json": "^4.0.0"
-      }
-    },
-    "cross-spawn": {
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-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
-      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
-      "dev": true,
-      "requires": {
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-        "path-key": "^2.0.1",
-        "semver": "^5.5.0",
-        "shebang-command": "^1.2.0",
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diff --git a/server/package-lock.json b/server/package-lock.json
index 8352c07..b52a93d 100644
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           "dev": true,
           "optional": true
         },
         "os-tmpdir": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
           "dev": true,
           "optional": true
         },
         "osenv": {
           "version": "0.1.5",
-          "resolved": "https://registry.npmjs.org/osenv/-/osenv-0.1.5.tgz",
+          "resolved": false,
           "integrity": "sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==",
           "dev": true,
           "optional": true,
@@ -3385,21 +3385,21 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
           "dev": true,
           "optional": true
         },
         "process-nextick-args": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
+          "resolved": false,
           "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
           "dev": true,
           "optional": true
         },
         "rc": {
           "version": "1.2.8",
-          "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
+          "resolved": false,
           "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
           "dev": true,
           "optional": true,
@@ -3412,7 +3412,7 @@
           "dependencies": {
             "minimist": {
               "version": "1.2.0",
-              "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+              "resolved": false,
               "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
               "dev": true,
               "optional": true
@@ -3421,7 +3421,7 @@
         },
         "readable-stream": {
           "version": "2.3.6",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "resolved": false,
           "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
           "dev": true,
           "optional": true,
@@ -3437,7 +3437,7 @@
         },
         "rimraf": {
           "version": "2.6.3",
-          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
+          "resolved": false,
           "integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
           "dev": true,
           "optional": true,
@@ -3447,49 +3447,49 @@
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "resolved": false,
           "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
           "dev": true,
           "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+          "resolved": false,
           "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
           "dev": true,
           "optional": true
         },
         "sax": {
           "version": "1.2.4",
-          "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
+          "resolved": false,
           "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
           "dev": true,
           "optional": true
         },
         "semver": {
           "version": "5.7.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "resolved": false,
           "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
           "dev": true,
           "optional": true
         },
         "set-blocking": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
           "dev": true,
           "optional": true
         },
         "signal-exit": {
           "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
           "dev": true,
           "optional": true
         },
         "string-width": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "optional": true,
@@ -3501,7 +3501,7 @@
         },
         "string_decoder": {
           "version": "1.1.1",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "resolved": false,
           "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
           "dev": true,
           "optional": true,
@@ -3511,7 +3511,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "optional": true,
@@ -3521,14 +3521,14 @@
         },
         "strip-json-comments": {
           "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
           "dev": true,
           "optional": true
         },
         "tar": {
           "version": "4.4.8",
-          "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.8.tgz",
+          "resolved": false,
           "integrity": "sha512-LzHF64s5chPQQS0IYBn9IN5h3i98c12bo4NCO7e0sGM2llXQ3p2FGC5sdENN4cTW48O915Sh+x+EXx7XW96xYQ==",
           "dev": true,
           "optional": true,
@@ -3544,14 +3544,14 @@
         },
         "util-deprecate": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
           "dev": true,
           "optional": true
         },
         "wide-align": {
           "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+          "resolved": false,
           "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
           "dev": true,
           "optional": true,
@@ -3561,14 +3561,14 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
           "dev": true,
           "optional": true
         },
         "yallist": {
           "version": "3.0.3",
-          "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
+          "resolved": false,
           "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
           "dev": true,
           "optional": true
@@ -8553,6 +8553,15 @@
         }
       }
     },
+    "ts-mockito": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/ts-mockito/-/ts-mockito-2.3.1.tgz",
+      "integrity": "sha512-chcKw0sTApwJxTyKhzbWxI4BTUJ6RStZKUVh2/mfwYqFS09PYy5pvdXZwG35QSkqT5pkdXZlYKBX196RRvEZdQ==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.5"
+      }
+    },
     "ts-node": {
       "version": "7.0.1",
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-7.0.1.tgz",
diff --git a/server/package.json b/server/package.json
index 629cedd..486ef12 100644
--- a/server/package.json
+++ b/server/package.json
@@ -43,6 +43,7 @@
     "prettier": "^1.15.3",
     "supertest": "^3.4.1",
     "ts-jest": "^23.10.5",
+    "ts-mockito": "^2.3.1",
     "ts-node": "^7.0.1",
     "tsconfig-paths": "^3.7.0",
     "tslint": "^5.12.1",
diff --git a/server/travis.yml b/server/travis.yml
deleted file mode 100644
index 7624b0a..0000000
--- a/server/travis.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-language: node_js
-
-sudo: false
-
-notifications:
-  email: false
-
-git:
-  depth: 1
-
-node_js:
-  - '11'
-  - '10'
-  - '9'
-
-before_install:
-  - npm update
-
-install:
-  - npm install
-
-script:
-  - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then bash ./travis/run_on_pull_requests.sh; fi'
-  - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash ./travis/run_on_non_pull_requests.sh; fi'
diff --git a/server/travis/run_on_non_pull_requests.sh b/travis/run_on_non_pull_requests.sh
similarity index 100%
rename from server/travis/run_on_non_pull_requests.sh
rename to travis/run_on_non_pull_requests.sh
diff --git a/server/travis/run_on_pull_requests.sh b/travis/run_on_pull_requests.sh
similarity index 62%
rename from server/travis/run_on_pull_requests.sh
rename to travis/run_on_pull_requests.sh
index 43af40e..22119ca 100644
--- a/server/travis/run_on_pull_requests.sh
+++ b/travis/run_on_pull_requests.sh
@@ -16,12 +16,4 @@ echo "npm test failed" >&2
 exit 1
 fi
 
-# npm test and check coverage
-npm run test:cov
-
-if [[ $? -ne 0 ]]; then
-echo "npm test coverage failed" >&2
-exit 1
-fi
-
 exit 0