Write basic tests for string matching.

src/test/java/org/nwapw/abacus/tests/LexerTests.java

@@ -1,12 +1,31 @@
 package org.nwapw.abacus.tests;
 
+import org.junit.Assert;
+import org.junit.Test;
 import org.nwapw.abacus.lexing.Lexer;
-import org.nwapw.abacus.tree.TokenType;
+import org.nwapw.abacus.lexing.pattern.Match;
+
+import java.util.List;
 
 public class LexerTests {
 
-    Lexer<TokenType> lexer = new Lexer<TokenType>(){{
+    @Test
+    public void testBasicSuccess(){
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("abc", 0);
+        lexer.register("def", 1);
+        List<Match<Integer>> matchedIntegers = lexer.lexAll("abcdefabc", 0, Integer::compare);
+        Assert.assertEquals(matchedIntegers.get(0).getType(), Integer.valueOf(0));
+        Assert.assertEquals(matchedIntegers.get(1).getType(), Integer.valueOf(1));
+        Assert.assertEquals(matchedIntegers.get(2).getType(), Integer.valueOf(0));
+    }
 
-    }};
+    @Test
+    public void testBasicFailure(){
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("abc", 0);
+        lexer.register("def", 1);
+        Assert.assertNull(lexer.lexAll("abcdefabcz", 0, Integer::compare));
+    }
 
 }