change test framework to use files for in and out (s-exp)

test/cases/basic/module_name.tst

@@ -0,0 +1,3 @@
+FooBar 
+-- -- --
+s(:list,  [s(:module,  "FooBar")])

test/cases/basic/name.tst

@@ -0,0 +1,3 @@
+foo 
+-- -- --
+s(:list,  [s(:name,  "foo")])

test/cases/basic/name_underscode_middle.tst

@@ -0,0 +1,3 @@
+foo_bar 
+-- -- --
+s(:list,  [s(:name,  "foo_bar")])

test/cases/basic/name_underscode_start.tst

@@ -0,0 +1,3 @@
+_bar 
+-- -- --
+s(:list,  [s(:name,  "_bar")])

test/cases/basic/number.tst

@@ -0,0 +1,3 @@
+42 
+-- -- --
+s(:list,  [s(:int,  42)])

test/cases/basic/string.tst

@@ -0,0 +1,3 @@
+"hello"
+-- -- --
+s(:list,  [s(:string,  "hello")])

test/cases/basic/string_escapes.tst

@@ -0,0 +1,3 @@
+"hello  \nyou"
+-- -- --
+s(:list,  [s(:string,  "hello  \\nyou")])