Add unit test for #4 - Magic chars in StringPattern character groups …

…behaving incorrectly

rembulan-tests/src/test/java/net/sandius/rembulan/lib/StringLib_Issue_4_Test.java

@@ -0,0 +1,99 @@
+package net.sandius.rembulan.lib;
+
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runners.MethodSorters;
+
+import net.sandius.rembulan.testenv.TestBase;
+
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class StringLib_Issue_4_Test extends TestBase {
+  @Test
+  public void _test_a_match_a() throws Exception {
+    // Given:
+    String program = "return string.match(\"a\",\"a\")";
+
+    // When:
+    Object[] actual = run(program);
+
+    // Then:
+    assertThat(actual).isEqualTo(new Object[] {"a"});
+  }
+
+  @Test
+  public void _test_1_match_not_1() throws Exception {
+
+    // Given:
+    String program = "return string.match(\"1\",\"[^1]\")";
+
+    // When:
+    Object[] actual = run(program);
+
+    // Then:
+    assertThat(actual).isEqualTo(new Object[] {null});
+  }
+
+  @Test
+  public void _test_1_match_not_0() throws Exception {
+
+    // Given:
+    String program = "return string.match(\"1\",\"[^0]\")";
+
+    // When:
+    Object[] actual = run(program);
+
+    // Then:
+    assertThat(actual).isEqualTo(new Object[] {"1"});
+  }
+
+  @Test
+  public void _test_1_match_1() throws Exception {
+
+    // Given:
+    String program = "return string.match(\"1\",\"[1]\")";
+
+    // When:
+    Object[] actual = run(program);
+
+    // Then:
+    assertThat(actual).isEqualTo(new Object[] {"1"});
+  }
+
+  @Test
+  public void _test_1_match_0() throws Exception {
+
+    // Given:
+    String program = "return string.match(\"1\",\"[0]\")";
+
+    // When:
+    Object[] actual = run(program);
+
+    // Then:
+    assertThat(actual).isEqualTo(new Object[] {null});
+  }
+
+  @Test
+  public void _test_plus_match_plus() throws Exception {
+
+    // Given:
+    String program = "return string.match(\"+\",\"[+]\")";
+
+    // When:
+    Object[] actual = run(program);
+
+    // Then:
+    assertThat(actual).isEqualTo(new Object[] {null});
+  }
+
+  @Test
+  public void test() throws Exception {
+    // Given:
+    String program = "string.match(tostring(0.5), \"([^05+])\")";
+
+    // When:
+    Object[] actual = run(program);
+
+    // Then:
+    assertThat(actual).isEqualTo(new Object[] {"."});
+  }
+}