diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..350cfd0
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,17 @@
+name: Continuous Integration
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install MIT Scheme
+        run: sudo apt-get install mit-scheme
+
+      - name: Run All Tests
+        run: bash test-runner.sh
diff --git a/test-runner.sh b/test-runner.sh
new file mode 100644
index 0000000..c29213d
--- /dev/null
+++ b/test-runner.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+set -e
+
+GREEN="\033[0;32m"
+RED="\033[0;31m"
+RESET="\033[0m"
+
+echo
+echo "Running all Scheme tests..."
+
+total_tests=0
+total_passed=0
+total_failed=0
+
+for project in */; do
+    test_dir="${project}tests"
+    if [ -d "$test_dir" ]; then
+        for test_file in "$test_dir"/*.scm; do
+            if [ -f "$test_file" ]; then
+
+                output=$(mit-scheme --batch-mode --load "$test_file" 2>&1)
+
+                if echo "$output" | grep -q "Assertion failed"; then
+                    echo "$output"
+                fi
+
+                passed=$(echo "$output" | grep "Passed:" | awk '{print $2}')
+                failed=$(echo "$output" | grep "Failed:" | awk '{print $2}')
+                count=$(echo "$output" | grep "Total tests:" | awk '{print $3}')
+
+                total_tests=$((total_tests + count))
+                total_passed=$((total_passed + passed))
+                total_failed=$((total_failed + failed))
+            fi
+        done
+    fi
+done
+
+echo
+echo "=============================="
+echo -e "Total Passed: ${GREEN}${total_passed}${RESET}"
+echo -e "Total Failed: ${RED}${total_failed}${RESET}"
+echo -e "Total Tests:  ${total_tests}"
+echo "=============================="
+
+if [ "$total_failed" -gt 0 ]; then
+    exit 1
+else
+    exit 0
+fi
diff --git a/test-utils.scm b/test-utils.scm
new file mode 100644
index 0000000..106e906
--- /dev/null
+++ b/test-utils.scm
@@ -0,0 +1,38 @@
+(define test-name "")
+(define test-results '())
+
+(define (initialize-test name)
+  (set! test-name name)
+  (set! test-results '()))
+
+(define (assert-equal expected actual)
+  (let ((result (equal? expected actual)))
+    (set! test-results (cons result test-results))
+    (if result
+        #t
+        (begin
+          (display "\nAssertion failed in \"") 
+          (display test-name) (display "\":\n")
+          
+          (display "  Expected: ") (write expected) (newline)
+          (display "  Got: ") (write actual) (newline)))
+    result))
+
+(define (count pred lst)
+  (if (null? lst)
+      0
+      (+ (if (pred (car lst)) 1 0)
+         (count pred (cdr lst))
+      )))
+
+(define (end-test)
+  (let* ((total (length test-results))
+         (passed (count (lambda (x) x) test-results))
+         (failed (- total passed)))
+    (newline)
+    (display "Finished running \"") (display test-name) (display "\": \n")
+    (display "  Total tests: ") (write total) (newline)
+    (display "  Passed: ") (write passed) (newline)
+    (display "  Failed: ") (write failed) (newline)
+    (newline)
+    (exit)))