diff --git a/Cargo.lock b/Cargo.lock
index fc8ee1c..eea7a63 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,6 +6,20 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "assert_cmd"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a88b6bd5df287567ffdf4ddf4d33060048e1068308e5f62d81c6f9824a045a48"
+dependencies = [
+ "bstr",
+ "doc-comment",
+ "predicates",
+ "predicates-core",
+ "predicates-tree",
+ "wait-timeout",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.0.1"
@@ -151,6 +165,18 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "difference"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
+
+[[package]]
+name = "doc-comment"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
+
 [[package]]
 name = "either"
 version = "1.6.1"
@@ -346,6 +372,7 @@ dependencies = [
 name = "opentally"
 version = "0.1.0"
 dependencies = [
+ "assert_cmd",
  "clap",
  "console_error_panic_hook",
  "csv",
@@ -376,6 +403,32 @@ version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acbf547ad0c65e31259204bd90935776d1c693cec2f4ff7abb7a1bbbd40dfe58"
 
+[[package]]
+name = "predicates"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f49cfaf7fdaa3bfacc6fa3e7054e65148878354a5cfddcf661df4c851f8021df"
+dependencies = [
+ "difference",
+ "predicates-core",
+]
+
+[[package]]
+name = "predicates-core"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57e35a3326b75e49aa85f5dc6ec15b41108cf5aee58eabb1f274dd18b73c2451"
+
+[[package]]
+name = "predicates-tree"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15f553275e5721409451eb85e15fd9a860a6e5ab4496eb215987502b5f5391f2"
+dependencies = [
+ "predicates-core",
+ "treeline",
+]
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -494,6 +547,12 @@ version = "0.13.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cd05616119e612a8041ef58f2b578906cc2531a6069047ae092cfb86a325d835"
 
+[[package]]
+name = "treeline"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7f741b240f1a48843f9b8e0444fb55fb2a4ff67293b50a9179dfd5ea67f8d41"
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.7.1"
@@ -518,6 +577,15 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
 
+[[package]]
+name = "wait-timeout"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f200f5b12eb75f8c1ed65abd4b2db8a6e1b138a20de009dacee265a2498f3f6"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.74"
diff --git a/Cargo.toml b/Cargo.toml
index 110e3e5..76fb725 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,9 @@ num-bigint = "0.4.0"
 num-rational = "0.4.0"
 paste = "1.0.5"
 
+# For tests
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+assert_cmd = "1.0.5"
 csv = "1.1.6"
 flate2 = "1.0"
 xmltree = "0.10.3"
diff --git a/coverage.sh b/coverage.sh
new file mode 100755
index 0000000..bf11a9a
--- /dev/null
+++ b/coverage.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+mkdir -p target/coverage/prof
+rm target/coverage/prof/*.profraw
+
+export RUSTC=./rustc_bs.sh
+export RUSTFLAGS="-Zinstrument-coverage -Copt-level=0 -Clink-dead-code"
+export LLVM_PROFILE_FILE="target/coverage/prof/opentally-%p-%m.profraw"
+export CARGO_TARGET_DIR=target/coverage
+cargo test
+
+grcov target/coverage/prof --binary-path target/coverage/debug -t html -o target/coverage/html \
+	--ignore src/numbers/rational_num.rs \
+	--ignore src/stv/wasm.rs \
+	--ignore 'tests/*'
diff --git a/rustc_bs.sh b/rustc_bs.sh
new file mode 100755
index 0000000..a847e10
--- /dev/null
+++ b/rustc_bs.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+RUSTC_BOOTSTRAP=1 rustc $@
+
diff --git a/tests/cli.rs b/tests/cli.rs
new file mode 100644
index 0000000..945e87c
--- /dev/null
+++ b/tests/cli.rs
@@ -0,0 +1,27 @@
+/*  OpenTally: Open-source election vote counting
+ *  Copyright © 2021 Lee Yingtong Li (RunasSudo)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+use assert_cmd::prelude::*;
+
+use std::process::Command;
+
+#[test]
+fn cli_ers97() {
+	Command::cargo_bin("opentally").expect("Cargo Error")
+		.args(&["stv", "tests/data/ers97.blt", "--numbers", "fixed", "--decimals", "5", "--round-tvs", "2", "--round-weights", "2", "--round-votes", "2", "--round-quota", "2", "--quota", "droop_exact", "--quota-mode", "ers97", "--surplus", "eg", "--transferable-only", "--exclusion", "by_value"])
+		.assert().success();
+}