tests: v implementation of repl tests

compiler/tests/repl/repl_test.v

@@ -0,0 +1,25 @@
+import os
+
+fn test_repl() {
+	test_files := os.walk_ext('.', '.repl')
+
+  for file in test_files {
+    content := os.read_file(file) or {
+      assert false
+      break
+    }
+    input := content.all_before('===output===\n').replace('$', '\\$')
+    output := content.all_after('===output===\n')
+    r := os.exec('echo "$input" | ./v') or {
+      assert false
+      break
+    }
+    result := r.output.replace('>>> ', '').replace('>>>', '').all_after('Use Ctrl-C or `exit` to exit\n')
+    assert result == output
+    if result != output {
+      println(file)
+      println('Got : $result')
+      println('Expected : $output')
+    }
+  }
+}