diff --git a/README.md b/README.md
index 2457b20..0dfc9dd 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,16 @@ calculation = 100-50
 - `operation_array` = an array of all the operations
 - `calculation` = the calculation to be used
 
+## Tests
+
+Make sure you have [`bats`](https://github.com/bats-core/bats-core) installed from system repo or otherwise. Then run:
+
+```sh
+tests/run.sh
+# or
+path/to/bats --tap tests
+```
+
 ## TODO
 
 - ~~Better formatted ouput (perhaps `1,000,000` instead of `1000000` for example)~~
diff --git a/tests/common.bash b/tests/common.bash
new file mode 100755
index 0000000..9c3b1f3
--- /dev/null
+++ b/tests/common.bash
@@ -0,0 +1,3 @@
+REPO_ROOT_PATH="$PWD"
+BINARY_FILE="$PWD/bcalc"
+
diff --git a/tests/pemdas.bats b/tests/pemdas.bats
new file mode 100755
index 0000000..4eb51e3
--- /dev/null
+++ b/tests/pemdas.bats
@@ -0,0 +1,43 @@
+#!/usr/bin/env bats
+
+load common
+
+@test "Single brackets test" {
+	result="$($BINARY_FILE '(2+2)')"
+	[ "$result" -eq 4 ]
+}
+
+@test "Single brackets with basic math test" {
+	result="$($BINARY_FILE '(5+5)/2')"
+	[ "$result" -eq 5 ]
+}
+
+@test "Exponent in bracket with math test" {
+	result="$($BINARY_FILE '(2^2)*2')"
+	[ "$result" -eq 8 ]
+}
+
+@test "2 levels of brackets test" {
+	result="$($BINARY_FILE '((2+2)+2)')"
+	[ "$result" -eq 6 ]
+}
+
+@test "3 levels of brackets test" {
+	result="$($BINARY_FILE '(((2+2)+2)+2)')"
+	[ "$result" -eq 8 ]
+}
+
+@test "Multiple digits without bracket first test" {
+	result="$($BINARY_FILE '1+2*3')"
+	[ "$result" -eq 7 ]
+}
+
+@test "Multiple digits without bracket second test" {
+	result="$($BINARY_FILE '6-1*0+3/3')"
+	[ "$result" -eq 7 ]
+}
+
+@test "Multiple digits with bracket and operations test" {
+	result="$($BINARY_FILE '500-(4*2^2+12)')"
+	[ "$result" -eq 472 ]
+}
diff --git a/tests/run.sh b/tests/run.sh
new file mode 100755
index 0000000..79369b2
--- /dev/null
+++ b/tests/run.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+REPO_ROOT="$(dirname $(dirname $(realpath $0)))"
+bats --tap "$REPO_ROOT/tests"
diff --git a/tests/simple.bats b/tests/simple.bats
new file mode 100755
index 0000000..c3a68b4
--- /dev/null
+++ b/tests/simple.bats
@@ -0,0 +1,40 @@
+#!/usr/bin/env bats
+
+load common
+
+@test "Addition test" {
+	result="$($BINARY_FILE 2+2)"
+	[ "$result" -eq 4 ]
+}
+
+@test "Subtraction test" {
+	result="$($BINARY_FILE 4-2)"
+	[ "$result" -eq 2 ]
+}
+
+@test "Multiplication test" {
+	result="$($BINARY_FILE 4*2)"
+	[ "$result" -eq 8 ]
+}
+
+@test "Division test" {
+	result="$($BINARY_FILE 4/2)"
+	[ "$result" -eq 2 ]
+}
+
+@test "Division with remainder test" {
+	result="$($BINARY_FILE 5%2)"
+	[ "$result" -eq 1 ]
+}
+
+@test "Exponent test" {
+	result="$($BINARY_FILE 3^2)"
+	[ "$result" -eq 9 ]
+}
+
+@test "Decimal not supported error test" {
+	run "$BINARY_FILE" 1.1+2.2
+	[ $status -eq 1 ]
+	[ "${lines[0]}" == "Only digits, parenthesis, '^', '*', '%', '/', '+', and '-', are supported." ]
+	[ "${lines[1]}" == "'.' is currently unsupported." ]
+}