diff --git a/.travis.yml b/.travis.yml
index 3e0f671b778..7c104d1270a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,8 @@ matrix:
       env: TEST=unit_and_e2e_clients
     - node_js: 10
       env: TEST=e2e_truffle
+    - node_js: 10
+      env: TEST=e2e_mosaic
     - node_js: 10
       env: TEST=e2e_browsers
       addons:
@@ -26,6 +28,8 @@ matrix:
   allow_failures:
     - node_js: 10
       env: TEST=e2e_truffle
+    - node_js: 10
+      env: TEST=e2e_mosaic
 
 addons:
   apt:
@@ -45,7 +49,7 @@ before_install:
   - export DISPLAY=:99.0
   - export PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
 install:
-  - if [ $TEST != "e2e_truffle" ]; then
+  - if [[ $TEST != "e2e_truffle" ]] && [[ $TEST != "e2e_mosaic" ]]; then
       npm install;
     fi
 script:
diff --git a/package.json b/package.json
index c2a284a3422..b570969283a 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,7 @@
         "test:e2e:browsers": "npm run build; npm run test:e2e:chrome; npm run test:e2e:firefox",
         "test:e2e:publish": "./scripts/e2e.npm.publish.sh",
         "test:e2e:truffle": "./scripts/e2e.truffle.sh",
+        "test:e2e:mosaic": "./scripts/e2e.mosaic.sh",
         "ci": "./scripts/ci.sh",
         "coveralls": "./scripts/coveralls.sh"
     },
diff --git a/scripts/ci.sh b/scripts/ci.sh
index a1d5e11994a..584ee6431b1 100755
--- a/scripts/ci.sh
+++ b/scripts/ci.sh
@@ -39,4 +39,9 @@ elif [ "$TEST" = "e2e_truffle" ]; then
   npm run test:e2e:publish
   npm run test:e2e:truffle
 
+elif [ "$TEST" = "e2e_mosaic" ]; then
+
+  npm run test:e2e:publish
+  npm run test:e2e:mosaic
+
 fi
diff --git a/scripts/e2e.mosaic.sh b/scripts/e2e.mosaic.sh
new file mode 100755
index 00000000000..26d84019428
--- /dev/null
+++ b/scripts/e2e.mosaic.sh
@@ -0,0 +1,56 @@
+# -------------------------------------------------------------------------------------------
+# Run mosaicdao/mosaic-1 fork (w/ buidler truffle5 plugin) using a candidate
+# branch of web3 which has been published to a proxy npm registry in `e2e.npm.publish.sh`
+#
+# This test's purpose is to watch web3 execute a long, complex test suite
+# It uses buidler-adapted fork of mosaicdao because that tool is simpler and
+# more modular than Truffle and lets us resolve arbitrary versions of web3 more easily.
+# --------------------------------------------------------------------------------------------
+
+# Exit immediately on error
+set -o errexit
+
+# To mimic `npm install web3` correctly, this test does not install Web3's dev deps.
+# However, we need the npm package `semver` to coerce yarn resolutions correctly.
+# It must be installed as a dev dep or Node complains. We also need web3's package.json
+# to resolve the current version + patch increment. So some file renaming is necessary here...
+cp package.json original.package.json
+rm package.json
+rm package-lock.json
+npm init --yes
+npm install --save-dev semver
+
+# Install mosaic and set yarn resolutions to virtually published patch version
+git clone https://github.com/cgewecke/mosaic-1.git
+scripts/js/resolutions.js mosaic-1
+cd mosaic-1
+
+# Install via registry and verify
+echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+echo "Installing updated web3 via virtual registry "
+echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+
+git submodule update --init --recursive
+yarn --registry http://localhost:4873
+
+yarn add web3@e2e --registry http://localhost:4873
+
+yarn list web3
+yarn list web3-utils
+yarn list web3-core
+yarn list web3-core-promievent
+
+cat ./package.json
+
+# Test
+echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+echo "Running mosaicdao/mosaic-1 unit tests.      "
+echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+
+# Launch ganache
+./tools/run_ganache_cli.sh </dev/null 1>/dev/null 2>&1 &
+sleep 10
+
+# Compile and test
+npx buidler compile
+npm test
diff --git a/scripts/e2e.npm.publish.sh b/scripts/e2e.npm.publish.sh
index b71595f3ad5..884004ccbf2 100755
--- a/scripts/e2e.npm.publish.sh
+++ b/scripts/e2e.npm.publish.sh
@@ -23,7 +23,6 @@ fi
 # what it needs here.
 npm install -g verdaccio@4.3.4
 npm install -g npm-auth-to-token@1.0.0
-npm install -g geth-dev-assistant@0.1.3
 npm install -g lerna@3.18.3
 
 # Launch npm proxy registry
diff --git a/scripts/e2e.truffle.sh b/scripts/e2e.truffle.sh
index 984931ab117..1a1b6fa2771 100755
--- a/scripts/e2e.truffle.sh
+++ b/scripts/e2e.truffle.sh
@@ -8,6 +8,9 @@
 # Exit immediately on error
 set -o errexit
 
+# Install test specific dependencies
+npm install -g geth-dev-assistant@0.1.3
+
 # Launch geth
 npm run geth
 
diff --git a/scripts/js/resolutions.js b/scripts/js/resolutions.js
new file mode 100755
index 00000000000..b6134829c16
--- /dev/null
+++ b/scripts/js/resolutions.js
@@ -0,0 +1,59 @@
+#!/usr/bin/env node
+
+/**
+ * This script is a helper for running a buidler based e2e unit test target and is
+ * used in combination with the npm virtual publishing script.
+ *
+ * It discovers the current web3 package version, gets its patch increment
+ * (also the value of the virtually published version) and attaches a yarn resolutions field
+ * to the target's package.json to coerce any Web3 packages up to the patch when target is
+ * installed.
+ *
+ * USAGE:    resolutions.js <target-folder-name>
+ * EXAMPLE:  node scripts/js/resolutions.js mosaic-1
+ *
+ */
+const fs = require('fs');
+const path = require('path');
+
+const semver = require('semver');
+const web3PackagePath = path.join(process.cwd(), 'original.package.json');
+const targetPackagePath = path.join(process.cwd(), process.argv[2], 'package.json');
+
+const web3Package = require(web3PackagePath);
+const targetPackage = require(targetPackagePath);
+
+const patch = semver.inc(web3Package.version, 'patch');
+
+targetPackage.resolutions = {
+  "@nomiclabs/**/web3": `${patch}`,
+  "@nomiclabs/**/web3-bzz": `${patch}`,
+  "@nomiclabs/**/web3-core-helpers": `${patch}`,
+  "@nomiclabs/**/web3-core-method": `${patch}`,
+  "@nomiclabs/**/web3-core-promievent": `${patch}`,
+  "@nomiclabs/**/web3-core-requestmanager": `${patch}`,
+  "@nomiclabs/**/web3-core-subscriptions": `${patch}`,
+  "@nomiclabs/**/web3-core": `${patch}`,
+  "@nomiclabs/**/web3-eth-abi": `${patch}`,
+  "@nomiclabs/**/web3-eth-accounts": `${patch}`,
+  "@nomiclabs/**/web3-eth-contract": `${patch}`,
+  "@nomiclabs/**/web3-eth-ens": `${patch}`,
+  "@nomiclabs/**/web3-eth-iban": `${patch}`,
+  "@nomiclabs/**/web3-eth-personal": `${patch}`,
+  "@nomiclabs/**/web3-eth": `${patch}`,
+  "@nomiclabs/**/web3-net": `${patch}`,
+  "@nomiclabs/**/web3-providers-http": `${patch}`,
+  "@nomiclabs/**/web3-providers-ipc": `${patch}`,
+  "@nomiclabs/**/web3-providers-ws": `${patch}`,
+  "@nomiclabs/**/web3-shh": `${patch}`,
+  "@nomiclabs/**/web3-utils": `${patch}`
+}
+
+console.log(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
+console.log(`Yarn will resolve Web3 packages in "${process.argv[2]}"" to...`);
+console.log(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
+
+console.log(JSON.stringify(targetPackage.resolutions, null, ' '));
+
+fs.writeFileSync(targetPackagePath, JSON.stringify(targetPackage, null, '    '));
+
diff --git a/test/contract.js b/test/contract.js
index b727ee937b8..7c2d43ec53f 100644
--- a/test/contract.js
+++ b/test/contract.js
@@ -3219,7 +3219,7 @@ describe('typical usage', function() {
         //     done();
         // });
 
-    }).timeout(6000);
+    }).timeout(10000);
         // TODO add error check
 });