Add tests for AliasProcessor

src/main/scala/com/nthportal/shell/extensions/alias/Alias.scala

@@ -9,3 +9,14 @@ package extensions.alias
   *                  used in an input line
   */
 case class Alias(name: String, expansion: String)
+
+object Alias {
+  /**
+    * Creates an alias for a command (with no added arguments).
+    *
+    * @param name    the name of the alias
+    * @param command the command for which it should be an alias
+    * @return an alias for the specified command
+    */
+  def forCommand(name: String, command: Command): Alias = apply(name, command.name)
+}

src/test/scala/com/nthportal/shell/extensions/alias/AliasProcessorTest.scala

@@ -0,0 +1,33 @@
+package com.nthportal.shell.extensions.alias
+
+import com.nthportal.shell.{Shell, SimpleSpec}
+import com.nthportal.shell.impl.{NoOpOutputProvider, TestCommand}
+import com.nthportal.shell.parsers.WhitespaceDelineatingParser
+
+class AliasProcessorTest extends SimpleSpec {
+
+  behavior of "AliasProcessor"
+
+  it should "process aliases properly" in {
+    val command = TestCommand()
+    val name = "alias"
+    val alias = Alias.forCommand(name, command)
+    val processor = AliasProcessor(alias)
+    val shell = Shell(WhitespaceDelineatingParser, NoOpOutputProvider, List(processor), command)
+
+    shell.executeLine(name)
+    command.executed should be (true)
+  }
+
+  it should "not loop infinitely" in {
+    val command = TestCommand()
+    val name = "alias"
+    val a1 = Alias(command.name, name)
+    val a2 = Alias.forCommand(name, command)
+    val processor = AliasProcessor(a1, a2)
+    val shell = Shell(WhitespaceDelineatingParser, NoOpOutputProvider, List(processor), List(command))
+
+    shell.executeLine(command.name)
+    command.executed should be (true)
+  }
+}