fixed normalization and provided tests for normalization (finally) !

src/test/java/io/github/robwin/markup/builder/AbstractMarkupDocBuilderTest.java

@@ -0,0 +1,45 @@
+package io.github.robwin.markup.builder;
+
+import io.github.robwin.markup.builder.asciidoc.AsciiDoc;
+import org.apache.commons.codec.digest.DigestUtils;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.mock;
+
+public class AbstractMarkupDocBuilderTest {
+
+    AbstractMarkupDocBuilder builder;
+
+    @Before
+    public void setUp() {
+        builder = mock(AbstractMarkupDocBuilder.class, Mockito.CALLS_REAL_METHODS);
+    }
+
+    private String normalize(String anchor) {
+        return builder.normalizeAnchor(AsciiDoc.SPACE_ESCAPE, anchor);
+    }
+
+    private void assertNormalization(String result, String anchor) {
+        assertEquals(result, normalize(anchor));
+    }
+
+    @Test
+    public void testNormalizeAnchor() throws Exception {
+        assertNormalization("", "");
+        assertNormalization("anchor", "anchor");
+        assertNormalization("anchor", "aNcHoR");
+        assertNormalization("__anchor__", "_ anchor _");
+        assertNormalization("-_anchor_-", "- anchor -");
+        assertNormalization("classic-simple_anchor", "classic-simple_anchor");
+        assertNormalization("an_chor", "     an    chor  ");
+        assertNormalization("anchor", "#  anchor  &");
+        assertNormalization(DigestUtils.md5Hex("\u0240"), "\u0240");
+        assertNormalization(normalize("\u0240"), " \u0240 ");
+        assertNormalization(DigestUtils.md5Hex("µu_\u0240this_-_"), "  µ&|ù \u0240This .:/-_#  ");
+        assertNormalization("this_is_a_funky_string", "Tĥïŝ ĩš â fůňķŷ Šťŕĭńġ");
+        assertNormalization("", "  @#&(){}[]§!¡$*£%+=/:.;,?¿\\<>| ");
+    }
+}