Added koans about literals such as Int, String, Float, and Symbols

src/test/scala/org/scalakoans/AboutAsserts.scala

@@ -20,9 +20,17 @@ class AboutAsserts extends KoanSuite {
     val v1 = 4
     val v2 = 3
 
+    meditate
     v1 should be(v2)
   }
 
+  koan("can also use equal as a matcher") {
+    val v1 = 4
+    val v2 = 3
+
+    __ should equal(v2)
+  }
+
   koan ("sometimes we expect you to fill in the values") {
     (1+1) should __
   }

src/test/scala/org/scalakoans/AboutLiterals.scala

@@ -0,0 +1,42 @@
+package org.scalakoans
+
+import support.KoanSuite
+
+class AboutLiterals extends KoanSuite {
+  koan("integer literals") {
+    val i = 1
+
+    i.isInstanceOf[Int] should __
+  }
+
+  koan("float literals") {
+    val f = 2.0
+
+    f.isInstanceOf[___] should be(true)
+  }
+
+  koan("string literals") {
+    val s = "abcd"
+
+    s.isInstanceOf[___] should be(true)
+
+    s.toUpperCase() should __
+    s.length() should __
+
+    s.isInstanceOf[java.lang.String] should __
+
+    // sadly no string interpolation
+    val str = "%s - %d".format("abc", 123)
+    str should __
+
+    __ should not be theSameInstanceAs("abcd")
+  }
+
+  koan("symbol literals") {
+    val s = 'abc
+
+    s.isInstanceOf[___] should be(true)
+
+    __ should be theSameInstanceAs('abc)
+  }
+}

src/test/scala/org/scalakoans/Koans.scala

@@ -5,6 +5,7 @@ import org.scalatest._
 class Koans extends Suite {
   override def nestedSuites = List(
     new AboutAsserts,
-    new AboutValAndVar
+    new AboutValAndVar,
+    new AboutLiterals
   )
 }