New Snippet text, closes #618.

Change to the new Snippet text. Update History.md.
Fix a one off error in JRubySnippet.java.

src/main/java/cucumber/runtime/jruby/JRubySnippet.java

@@ -22,7 +22,7 @@ public String tableHint() {
     public String arguments(List<Class<?>> argumentTypes) {
         StringBuilder sb = new StringBuilder(argumentTypes.isEmpty() ? "" : "|");
         for (int n = 0; n < argumentTypes.size(); n++) {
-            if (n > 1) {
+            if (n > 0) {
                 sb.append(", ");
             }
             sb.append("arg").append(n + 1);

src/test/java/cucumber/runtime/jruby/JRubySnippetTest.java

@@ -0,0 +1,32 @@
+package cucumber.runtime.jruby;
+
+import cucumber.runtime.snippets.SnippetGenerator;
+import gherkin.formatter.model.Comment;
+import gherkin.formatter.model.Step;
+import org.junit.Test;
+
+import java.util.Collections;
+import java.util.List;
+
+import static java.util.Arrays.asList;
+import static org.junit.Assert.assertEquals;
+
+public class JRubySnippetTest {
+
+    private static final List<Comment> NO_COMMENTS = Collections.emptyList();
+
+    @Test
+    public void generatesPlainSnippet() {
+        String expected = "" +
+                "Given /^I have (\\d+) cukes in my \"([^\"]*)\" belly$/ do |arg1, arg2|\n" +
+                "  # Write code here that turns the phrase above into concrete actions\n" +
+                "  pending\n" +
+                "end\n";
+        assertEquals(expected, snippetFor("I have 4 cukes in my \"big\" belly"));
+    }
+
+    private String snippetFor(String name) {
+        Step step = new Step(NO_COMMENTS, "Given ", name, 0, null, null);
+        return new SnippetGenerator(new JRubySnippet()).getSnippet(step, null);
+    }
+}