diff --git a/.travis.yml b/.travis.yml
index 6b75fd98e..d2bfdd0db 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,8 @@ matrix:
 cache:
   apt: true
   directories:
+  - target/debug/deps
+  - target/debug/build
   - target/release/deps
   - target/release/build
 addons:
@@ -30,8 +32,14 @@ script:
 after_success: |
   wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz &&
   tar xzf master.tar.gz && mkdir kcov-master/build && cd kcov-master/build && cmake .. && make && make install DESTDIR=../tmp && cd ../.. &&
-  ls target/release &&
-  ./kcov-master/tmp/usr/local/bin/kcov --coveralls-id=${COVERALLS_TOKEN} --exclude-pattern=/.cargo --include-pattern=ethcore/src target/kcov target/release/deps/ethcore-* &&
+  cargo test --no-run -p ethcore-util &&
+  ./kcov-master/tmp/usr/local/bin/kcov --exclude-pattern /.cargo,/root/.multirust target/kcov target/debug/deps/ethcore_util-* &&
+  cargo test --no-run -p ethash &&
+  ./kcov-master/tmp/usr/local/bin/kcov --exclude-pattern /.cargo,/root/.multirust target/kcov target/debug/deps/ethash-* &&
+  cargo test --no-run -p ethcore --no-default-features &&
+  ./kcov-master/tmp/usr/local/bin/kcov --exclude-pattern /.cargo,/root/.multirust target/kcov target/debug/deps/ethcore-* &&
+  cargo test --no-run &&
+  ./kcov-master/tmp/usr/local/bin/kcov --coveralls-id=${COVERALLS_TOKEN} --exclude-pattern /.cargo,/root/.multirust target/kcov target/debug/parity-* 
   [ $TRAVIS_BRANCH = master ] &&
   [ $TRAVIS_PULL_REQUEST = false ] &&
   [ $TRAVIS_RUST_VERSION = nightly ] &&
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index ef8111272..c4eff8d05 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -25,6 +25,8 @@ crossbeam = "0.1.5"
 lazy_static = "0.1"
 
 [features]
+default = ["json-tests"]
 jit = ["evmjit"]
 evm_debug = []
+json-tests = []
 test-heavy = []
diff --git a/ethcore/src/tests/test_common.rs b/ethcore/src/tests/test_common.rs
index 87e7b979e..fd88ae96a 100644
--- a/ethcore/src/tests/test_common.rs
+++ b/ethcore/src/tests/test_common.rs
@@ -12,6 +12,7 @@ macro_rules! declare_test {
 		#[ignore]
 		#[test]
 		#[allow(non_snake_case)]
+		#[cfg(feature="json-tests")]
 		fn $id() {
 			test!($name);
 		}
@@ -20,6 +21,7 @@ macro_rules! declare_test {
 		#[cfg(feature = "test-heavy")]
 		#[test]
 		#[allow(non_snake_case)]
+		#[cfg(feature="json-tests")]
 		fn $id() {
 			test!($name);
 		}
@@ -27,6 +29,7 @@ macro_rules! declare_test {
 	($id: ident, $name: expr) => {
 		#[test]
 		#[allow(non_snake_case)]
+		#[cfg(feature="json-tests")]
 		fn $id() {
 			test!($name);
 		}