Implement tests for fish_indent

tests/indent.out

@@ -0,0 +1,80 @@
+Test1
+
+begin
+    echo hi
+
+
+end | cat | cat | begin
+    echo hi
+end | begin
+    begin
+        echo hi
+    end
+end arg
+
+Test2
+
+switch aloha
+
+    case alpha
+        echo sup
+
+    case beta gamma
+        echo hi
+
+end
+
+Test3
+
+function hello_world
+
+    begin
+        echo hi
+    end | cat
+
+    echo sup
+    echo sup
+    echo hello
+
+
+    echo hello
+end
+
+Test4
+
+echo alpha #comment1
+#comment2
+
+#comment3
+for i in abc #comment1
+    #comment2
+    echo hi
+end
+
+switch foo #abc
+    # bar
+    case bar
+        echo baz\
+qqq
+    case "*"
+        echo sup
+end
+Test5
+
+if true
+else if false
+echo alpha
+switch beta
+case gamma
+echo delta
+end
+end
+
+Test6
+
+begin
+    echo hi
+else
+echo bye
+end
+echo alpha "