diff --git a/Sources/rxcc/rxcc.swift b/Sources/rxcc/rxcc.swift
index da87785..b90e410 100644
--- a/Sources/rxcc/rxcc.swift
+++ b/Sources/rxcc/rxcc.swift
@@ -1,3 +1,5 @@
+import Foundation
+
 enum Constant {
     case Integer(value: Int)
 }
@@ -65,19 +67,54 @@ let program: Construct = [
 ]
 
 
+struct TestFile {
+    var name: String
+    var contents: String
+    var valid: Bool
+}
 
 @main
 struct rxcc {
     static func main() {
-        let lexed: [Substring] = lex(string: """
-        int main() {
-            return 100;
+        for testFile in getTestFiles() {
+            print("Testing \(testFile.valid ? "valid" : "invalid") file \(testFile.name):")
+            print(testFile.contents)
+            let lexed: [Substring] = lex(string: testFile.contents)
+            parse(lexed: lexed)
+            print()
         }
-        """)
-        parse(lexed: lexed)
     }
 }
 
+func getTestFiles() -> [TestFile] {
+    var testFiles: [TestFile] = [TestFile]()
+
+    let fileManager = FileManager.default
+    let path = "c/tests/stage_1"
+
+    do {
+        let validItems = try fileManager.contentsOfDirectory(atPath: path + "/valid")
+
+        for item in validItems {
+            let fileURL = URL(fileURLWithPath: path + "/valid").appendingPathComponent(item)
+            let text = try String(contentsOf: fileURL, encoding: .utf8)
+            testFiles.append(TestFile(name: item, contents: text, valid: true))
+        }
+
+        let invalidItems = try fileManager.contentsOfDirectory(atPath: path + "/invalid")
+
+        for item in invalidItems {
+            let fileURL = URL(fileURLWithPath: path + "/invalid").appendingPathComponent(item)
+            let text = try String(contentsOf: fileURL, encoding: .utf8)
+            testFiles.append(TestFile(name: item, contents: text, valid: false))
+        }
+    } catch {
+        print("You think I'm going to handle errors? You are mistaken.")
+    }
+
+    return testFiles
+}
+
 func lex(string: String) -> [Substring] {
     var line = string.replacing("\n", with: " ")
     line = line.replacing("\t", with: " ")
@@ -130,6 +167,9 @@ func validateConstruct(_ construct: Construct, tokens: inout [Token]) -> Bool {
                     print("VALIDATION FAILED FOR TOKEN \"\(token.content)\"")
                     return false
                 }
+            } else {
+                print("RAN OUT OF TOKENS")
+                return false
             }
         }
     }
@@ -138,15 +178,15 @@ func validateConstruct(_ construct: Construct, tokens: inout [Token]) -> Bool {
 }
 
 func categorizeToken(token: Substring) -> TokenType {
-    if token.firstMatch(of: /{/) != nil { return .BRACE_OPEN }
-    else if token.firstMatch(of: /}/) != nil { return .BRACE_CLOSE }
-    else if token.firstMatch(of: /\(/) != nil { return .PARENTHESIS_OPEN }
-    else if token.firstMatch(of: /\)/) != nil { return .PARENTHESIS_CLOSE }
-    else if token.firstMatch(of: /;/) != nil { return .SEMICOLON }
-    else if token.firstMatch(of: /int/) != nil { return .INT }
-    else if token.firstMatch(of: /return/) != nil { return .RETURN }
-    else if token.firstMatch(of: /[a-zA-Z]\w*/) != nil { return .IDENTIFIER }
-    else if token.firstMatch(of: /[0-9]+/) != nil { return .LITERAL_INTEGER }
+    if token.firstMatch(of: /^{$/) != nil { return .BRACE_OPEN }
+    else if token.firstMatch(of: /^}$/) != nil { return .BRACE_CLOSE }
+    else if token.firstMatch(of: /^\($/) != nil { return .PARENTHESIS_OPEN }
+    else if token.firstMatch(of: /^\)$/) != nil { return .PARENTHESIS_CLOSE }
+    else if token.firstMatch(of: /^;$/) != nil { return .SEMICOLON }
+    else if token.firstMatch(of: /^int$/) != nil { return .INT }
+    else if token.firstMatch(of: /^return$/) != nil { return .RETURN }
+    else if token.firstMatch(of: /^[a-zA-Z]\w*$/) != nil { return .IDENTIFIER }
+    else if token.firstMatch(of: /^[0-9]+$/) != nil { return .LITERAL_INTEGER }
 
     return .UNDEFINED
 }