Tests for scala#107 white space defect when parsing adjacent entities

Add unit tests to check for white space between XML entities.  One
test is the original example of two adjacent entities. An additional
test case *has* white space between entities, and is just an
affirmation of the existing behavior, and should be preserved.

This bug pops up when the preserveWS option is either enabled or
disabled for ConstructingParser.  This doubles the number of unit
tests to four.

The fifth unit test, listed first, of adjacent text characters is
rhetoric, and doesn't need to be included in the final merge.  The
previous sentence shouldn't be merged either.

[error] Test XMLTest.preserveNoSpaceBetweenEntitiesOptionEnabled failed:
[error]   expected: <<div>&lt;[]&lt;</div>>
[error]   but was: <<div>&lt;[ ]&lt;</div>>
[error] Test XMLTest.preserveNoSpaceBetweenEntitiesOptionDisabled failed:
[error]   expected: <<div>&lt;[]&lt;</div>>
[error]   but was: <<div>&lt;[ ]&lt;</div>>

src/test/scala/scala/xml/XMLTest.scala

@@ -835,6 +835,75 @@ expected closing tag of foo
     }
   }
 
+  @UnitTest
+  def preserveSpaceTextOptionDisabledIssue107: Unit = {
+
+    // This test is rhetorical, but is the argument for being
+    // consistent with entities.
+    val x = "<div>tt</div>"
+
+    val preserveWS = false
+
+    val d = ConstructingParser.fromSource(scala.io.Source.fromString(x), preserveWS).document
+
+    assertEquals(x, d.toString)
+  }
+
+  @UnitTest
+  def preserveNoSpaceBetweenEntitiesOptionDisabledIssue107: Unit = {
+
+    // This is the exammple given in the original post.
+    val x = "<div>&lt;&lt;</div>"
+
+    val preserveWS = false
+
+    val d = ConstructingParser.fromSource(scala.io.Source.fromString(x), preserveWS).document
+
+    // Should:
+    assertEquals(x, d.toString)
+    // But was adding a space:
+    // assertEquals("<div>&lt; &lt;</div>", d.toString)
+  }
+
+  @UnitTest
+  def preserveNoSpaceBetweenEntitiesOptionEnabledIssue107: Unit = {
+    val x = "<div>&lt;&lt;</div>"
+
+    // Shouldn't add space when this option is enabled, either.
+    val preserveWS = true
+
+    val d = ConstructingParser.fromSource(scala.io.Source.fromString(x), preserveWS).document
+
+    // Should:
+    assertEquals(x, d.toString)
+    // But was adding a space:
+    // assertEquals("<div>&lt; &lt;</div>", d.toString)
+  }
+
+  @UnitTest
+  def preserveSpaceBetweenEntitiesOptionEnabledIssue107: Unit = {
+    val x = "<div>&lt; &lt;</div>"
+
+    val preserveWS = true
+
+    val d = ConstructingParser.fromSource(scala.io.Source.fromString(x), preserveWS).document
+
+    // This was already correct in 1.0.5
+    assertEquals(x, d.toString)
+  }
+
+  @UnitTest
+  def preserveSpaceBetweenEntitiesOptionDisabledIssue107: Unit = {
+    val x = "<div>&lt; &lt;</div>"
+
+    val preserveWS = false
+
+    val d = ConstructingParser.fromSource(scala.io.Source.fromString(x), preserveWS).document
+
+    // This was already correct in 1.0.5
+    assertEquals(x, d.toString)
+  }
+
   @UnitTest
   def issue28: Unit = {
     val x = <x:foo xmlns:x="gaga"/>