diff --git a/Triangle.Compiler/build.gradle b/Triangle.Compiler/build.gradle
index 62c56de..9733b3f 100644
--- a/Triangle.Compiler/build.gradle
+++ b/Triangle.Compiler/build.gradle
@@ -9,10 +9,13 @@ repositories {
 
 
 dependencies {
-	implementation project(':Solutions.Triangle.AbstractMachine')
+	implementation project(':Triangle.AbstractMachine')
 	testImplementation group: 'junit', name: 'junit', version: '4.13.2'
 }
 
 application {
 	mainClass = 'Triangle.Compiler'
 }
+
+// allow access to programs for unit tests
+sourceSets.test.resources.srcDir file("$rootDir/programs")
\ No newline at end of file
diff --git a/Triangle.Compiler/src/main/java/triangle/Compiler.java b/Triangle.Compiler/src/main/java/triangle/Compiler.java
index 65020a8..9b5cbe4 100644
--- a/Triangle.Compiler/src/main/java/triangle/Compiler.java
+++ b/Triangle.Compiler/src/main/java/triangle/Compiler.java
@@ -71,7 +71,7 @@ public class Compiler {
 		}
 
 		scanner = new Scanner(source);
-		reporter = new ErrorReporter();
+		reporter = new ErrorReporter(false);
 		parser = new Parser(scanner, reporter);
 		checker = new Checker(reporter);
 		emitter = new Emitter(reporter);
@@ -80,7 +80,7 @@ public class Compiler {
 
 		// scanner.enableDebugging();
 		theAST = parser.parseProgram(); // 1st pass
-		if (reporter.numErrors == 0) {
+		if (reporter.getNumErrors() == 0) {
 			// if (showingAST) {
 			// drawer.draw(theAST);
 			// }
@@ -89,13 +89,13 @@ public class Compiler {
 			if (showingAST) {
 				drawer.draw(theAST);
 			}
-			if (reporter.numErrors == 0) {
+			if (reporter.getNumErrors() == 0) {
 				System.out.println("Code Generation ...");
 				encoder.encodeRun(theAST, showingTable); // 3rd pass
 			}
 		}
 
-		boolean successful = (reporter.numErrors == 0);
+		boolean successful = (reporter.getNumErrors() == 0);
 		if (successful) {
 			emitter.saveObjectProgram(objectName);
 			System.out.println("Compilation was successful.");
diff --git a/Triangle.Compiler/src/main/java/triangle/ErrorReporter.java b/Triangle.Compiler/src/main/java/triangle/ErrorReporter.java
index ee458bd..cfcc753 100644
--- a/Triangle.Compiler/src/main/java/triangle/ErrorReporter.java
+++ b/Triangle.Compiler/src/main/java/triangle/ErrorReporter.java
@@ -18,25 +18,44 @@ import triangle.syntacticAnalyzer.SourcePosition;
 
 public class ErrorReporter {
 
-	int numErrors;
-
-	ErrorReporter() {
+	private int numErrors;
+	
+	private boolean throwExceptions;
+
+	/**
+	 * @param throwExceptions if true, throw exceptions (good for unit tests) otherwise write to stdout
+	 */
+	public ErrorReporter(boolean throwExceptions) {
 		numErrors = 0;
+		this.throwExceptions = throwExceptions;
 	}
 
 	public void reportError(String message, String tokenName, SourcePosition pos) {
-		System.out.print("ERROR: ");
+
+		numErrors++;
+		
+		String s = ("ERROR: ");
 
 		for (int p = 0; p < message.length(); p++)
 			if (message.charAt(p) == '%')
-				System.out.print(tokenName);
+				s += tokenName;
 			else
-				System.out.print(message.charAt(p));
-		System.out.println(" " + pos.start + ".." + pos.finish);
-		numErrors++;
+				s += message.charAt(p);
+		s += (" " + pos.start + ".." + pos.finish);
+		
+		if (throwExceptions) {
+			throw new RuntimeException(s);
+		} else {
+			System.out.println(s);
+		}
+		
 	}
 
 	public void reportRestriction(String message) {
 		System.out.println("RESTRICTION: " + message);
 	}
+	
+	public int getNumErrors() {
+		return numErrors;
+	}
 }
diff --git a/Triangle.Compiler/src/test/java/triangle/syntacticAnalyser/TestScanner.java b/Triangle.Compiler/src/test/java/triangle/syntacticAnalyser/TestScanner.java
index 6b02c62..599f8be 100644
--- a/Triangle.Compiler/src/test/java/triangle/syntacticAnalyser/TestScanner.java
+++ b/Triangle.Compiler/src/test/java/triangle/syntacticAnalyser/TestScanner.java
@@ -1,14 +1,58 @@
 package triangle.syntacticAnalyser;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThrows;
 
 import org.junit.Test;
+import org.junit.function.ThrowingRunnable;
+
+import triangle.ErrorReporter;
+import triangle.abstractSyntaxTrees.AbstractSyntaxTree;
+import triangle.syntacticAnalyzer.Parser;
+import triangle.syntacticAnalyzer.Scanner;
+import triangle.syntacticAnalyzer.SourceFile;
 
 public class TestScanner {
 
 	@Test
-	public void test() {
-		fail("Not yet implemented");
+	public void testHi() {
+		// build.gradle has a line sourceSets.test.resources.srcDir file("$rootDir/programs")
+		// which adds the programs directory to the list of places Java can easily find files
+		// getResource() below searches for a file, which is in /programs 
+		SourceFile source = SourceFile.ofPath(this.getClass().getResource("/hi.tri").getFile().toString());
+
+		Scanner scanner = new Scanner(source);
+		ErrorReporter reporter = new ErrorReporter(true);
+		Parser parser = new Parser(scanner, reporter);
+		
+		parser.parseProgram();
+		
+		// we should get to here with no exceptions
+		
+		assertEquals("Problem compiling hi.tri", 0, reporter.getNumErrors());
+	}
+	
+
+	@Test
+	public void testHiNewComment() {
+		SourceFile source = SourceFile.ofPath(this.getClass().getResource("/hi-newcomment.tri").getFile().toString());
+
+		Scanner scanner = new Scanner(source);
+		ErrorReporter reporter = new ErrorReporter(true);
+		Parser parser = new Parser(scanner, reporter);
+
+		// we expect an exception here as the program has invalid syntax
+		assertThrows(RuntimeException.class, new ThrowingRunnable() {
+			public void run(){
+				parser.parseProgram();
+			}
+		});
+		
+		// currently this program will fail
+		assertNotEquals("Problem compiling hi-newcomment.tri", 0, reporter.getNumErrors());
 	}
 
 }