diff --git a/run-tests.sh b/run-tests.sh
new file mode 100755
index 0000000..a308fa1
--- /dev/null
+++ b/run-tests.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# Simple script to run all compiler tests
+echo "Running all tests..."
+node test-harness.js
\ No newline at end of file
diff --git a/simple-test-runner.js b/simple-test-runner.js
new file mode 100644
index 0000000..2132677
--- /dev/null
+++ b/simple-test-runner.js
@@ -0,0 +1,42 @@
+#!/usr/bin/env node
+
+import fs from "node:fs/promises";
+
+async function main() {
+  const testFiles = await fs.readdir("./tests");
+  const cFiles = testFiles.filter(file => file.endsWith(".c"));
+  
+  let passed = 0;
+  let failed = 0;
+  
+  console.log(`Running ${cFiles.length} tests...\n`);
+  
+  for (const cFile of cFiles) {
+    try {
+      console.log(`Testing ${cFile}...`);
+      const { spawn } = await import("node:child_process");
+      const child = spawn("node", ["index.js", `tests/${cFile}`], { cwd: "." });
+      
+      child.on("close", (code) => {
+        if (code === 0) {
+          console.log(`  ✓ ${cFile} passed`);
+          passed++;
+        } else {
+          console.log(`  ✗ ${cFile} failed with code ${code}`);
+          failed++;
+        }
+      });
+      
+      child.stderr.on("data", (data) => {
+        console.error(`  Error: ${data.toString()}`);
+      });
+    } catch (error) {
+      console.log(`  ✗ ${cFile} failed with exception: ${error.message}`);
+      failed++;
+    }
+  }
+  
+  console.log(`\nResults: ${passed} passed, ${failed} failed`);
+}
+
+main().catch(console.error);
\ No newline at end of file
diff --git a/test-current.js b/test-current.js
new file mode 100644
index 0000000..a1d52fc
--- /dev/null
+++ b/test-current.js
@@ -0,0 +1,69 @@
+#!/usr/bin/env node
+
+// Test what we have working right now
+
+import fs from "node:fs/promises";
+import { spawn } from "node:child_process";
+
+async function runTest(testName) {
+  try {
+    console.log(`\nTesting ${testName}...`);
+    const child = spawn("node", ["index.js", `tests/${testName}`], { cwd: "." });
+    
+    return new Promise((resolve, reject) => {
+      let stderr = '';
+      
+      child.stderr.on("data", (data) => {
+        stderr += data.toString();
+      });
+      
+      child.on("close", (code) => {
+        if (code === 0) {
+          console.log(`  ✓ ${testName} - PASSED`);
+          resolve({ name: testName, passed: true });
+        } else {
+          console.log(`  ✗ ${testName} - FAILED (exit code ${code})`);
+          if (stderr) {
+            console.log(`    Error: ${stderr.substring(0, 100)}...`);
+          }
+          resolve({ name: testName, passed: false, error: stderr });
+        }
+      });
+    });
+  } catch (error) {
+    console.log(`  ✗ ${testName} - EXCEPTION: ${error.message}`);
+    return { name: testName, passed: false, error: error.message };
+  }
+}
+
+async function main() {
+  const testFiles = await fs.readdir("./tests");
+  const testNames = testFiles.filter(file => file.endsWith(".c"));
+  
+  console.log(`\nRunning current tests (${testNames.length} total)`);
+  
+  let results = [];
+  
+  for (const testName of testNames) {
+    const result = await runTest(testName);
+    results.push(result);
+  }
+  
+  const passed = results.filter(r => r.passed).length;
+  const failed = results.length - passed;
+  
+  console.log(`\nResults: ${passed} passed, ${failed} failed`);
+  
+  if (failed === 0) {
+    console.log("All tests passed! ✓");
+  } else {
+    console.log("Some tests failed! ✗");
+  }
+  
+  console.log("\nFailed tests:");
+  results.filter(r => !r.passed).forEach(r => {
+    console.log(`  - ${r.name}`);
+  });
+}
+
+main().catch(console.error);
\ No newline at end of file
diff --git a/tests/test-arithmetic.c b/tests/test-arithmetic.c
new file mode 100644
index 0000000..04dd163
--- /dev/null
+++ b/tests/test-arithmetic.c
@@ -0,0 +1,8 @@
+// test-arithmetic.c
+int main(int argc, int argv)
+{
+  int a = 5;
+  int b = 3;
+  int c = a + b;
+  return c;
+}
\ No newline at end of file
diff --git a/tests/test-basic.c b/tests/test-basic.c
new file mode 100644
index 0000000..6320519
--- /dev/null
+++ b/tests/test-basic.c
@@ -0,0 +1,5 @@
+// test-basic.c
+int main(int argc, int argv)
+{
+  return 0;
+}
\ No newline at end of file
diff --git a/tests/test-complex-expressions.c b/tests/test-complex-expressions.c
new file mode 100644
index 0000000..0d1a08b
--- /dev/null
+++ b/tests/test-complex-expressions.c
@@ -0,0 +1,9 @@
+// test-complex-expressions.c
+int main(int argc, int argv)
+{
+  int a = 2;
+  int b = 3;
+  int c = 4;
+  int result = a + b * c - 1;
+  return result;
+}
\ No newline at end of file
diff --git a/tests/test-compound.c b/tests/test-compound.c
new file mode 100644
index 0000000..85887ff
--- /dev/null
+++ b/tests/test-compound.c
@@ -0,0 +1,9 @@
+// test-compound.c
+int main(int argc, int argv)
+{
+  int a = 5;
+  int b = 3;
+  int c = 2;
+  int result = a + b * c;
+  return result;
+}
\ No newline at end of file
diff --git a/tests/test-expression-variables.c b/tests/test-expression-variables.c
new file mode 100644
index 0000000..39ede50
--- /dev/null
+++ b/tests/test-expression-variables.c
@@ -0,0 +1,8 @@
+// test-expression-variables.c
+int main(int argc, int argv)
+{
+  int x = 10;
+  int y = 20;
+  int z = x + y;
+  return z;
+}
\ No newline at end of file
diff --git a/tests/test-function-call.c b/tests/test-function-call.c
new file mode 100644
index 0000000..84fa3be
--- /dev/null
+++ b/tests/test-function-call.c
@@ -0,0 +1,11 @@
+// test-function-call.c
+int add(int a, int b)
+{
+  return a + b;
+}
+
+int main(int argc, int argv)
+{
+  int result = add(5, 3);
+  return result;
+}
\ No newline at end of file
diff --git a/tests/test-function-decl.c b/tests/test-function-decl.c
new file mode 100644
index 0000000..319d688
--- /dev/null
+++ b/tests/test-function-decl.c
@@ -0,0 +1,10 @@
+// test-function-decl.c
+int add(int a, int b)
+{
+  return a + b;
+}
+
+int main(int argc, int argv)
+{
+  return add(1, 2);
+}
\ No newline at end of file
diff --git a/tests/test-local-vars.c b/tests/test-local-vars.c
new file mode 100644
index 0000000..ee6795f
--- /dev/null
+++ b/tests/test-local-vars.c
@@ -0,0 +1,8 @@
+// test-local-vars.c
+int main(int argc, int argv)
+{
+  int a = 1;
+  int b = 2;
+  int c = a + b;
+  return c;
+}
\ No newline at end of file
diff --git a/tests/test-multistatement.c b/tests/test-multistatement.c
new file mode 100644
index 0000000..1b061ee
--- /dev/null
+++ b/tests/test-multistatement.c
@@ -0,0 +1,8 @@
+// test-multistatement.c
+int main(int argc, int argv)
+{
+  int a = 1;
+  int b = 2;
+  int c = a + b;
+  return c;
+}
\ No newline at end of file
diff --git a/tests/test-return.c b/tests/test-return.c
new file mode 100644
index 0000000..a5b4172
--- /dev/null
+++ b/tests/test-return.c
@@ -0,0 +1,10 @@
+// test-return.c
+int return_test(int x)
+{
+  return x;
+}
+
+int main(int argc, int argv)
+{
+  return return_test(42);
+}
\ No newline at end of file
diff --git a/tests/test-simple-arithmetic.c b/tests/test-simple-arithmetic.c
new file mode 100644
index 0000000..c51cd3e
--- /dev/null
+++ b/tests/test-simple-arithmetic.c
@@ -0,0 +1,8 @@
+// test-simple-arithmetic.c
+int main(int argc, int argv)
+{
+  int a = 10;
+  int b = 20;
+  int c = a + b;
+  return c;
+}
\ No newline at end of file
diff --git a/tests/test-simple-function.c b/tests/test-simple-function.c
new file mode 100644
index 0000000..7fa2459
--- /dev/null
+++ b/tests/test-simple-function.c
@@ -0,0 +1,10 @@
+// test-simple-function.c
+int add(int a, int b)
+{
+  return a + b;
+}
+
+int main(int argc, int argv)
+{
+  return add(1, 2);
+}
\ No newline at end of file
diff --git a/tests/test-simple-return.c b/tests/test-simple-return.c
new file mode 100644
index 0000000..58444a4
--- /dev/null
+++ b/tests/test-simple-return.c
@@ -0,0 +1,5 @@
+// test-simple-return.c
+int main(int argc, int argv)
+{
+  return 42;
+}
\ No newline at end of file
diff --git a/tests/test-simple.c b/tests/test-simple.c
new file mode 100644
index 0000000..3aaab5f
--- /dev/null
+++ b/tests/test-simple.c
@@ -0,0 +1,5 @@
+// Simple test for basic compiler functionality
+int main(int argc, int argv)
+{
+  return 0;
+}
\ No newline at end of file
diff --git a/tests/test-variable-assign.c b/tests/test-variable-assign.c
new file mode 100644
index 0000000..3996218
--- /dev/null
+++ b/tests/test-variable-assign.c
@@ -0,0 +1,7 @@
+// test-variable-assign.c
+int main(int argc, int argv)
+{
+  int x = 5;
+  x = 10;
+  return x;
+}
\ No newline at end of file
diff --git a/tests/test-variable-decl.c b/tests/test-variable-decl.c
new file mode 100644
index 0000000..21b8f45
--- /dev/null
+++ b/tests/test-variable-decl.c
@@ -0,0 +1,6 @@
+// test-variable-decl.c
+int main(int argc, int argv)
+{
+  int x = 10;
+  return x;
+}
\ No newline at end of file