Add test runner

.gitignore

@@ -1,2 +1,3 @@
 /target
-/book/build
+/book/build
+Gemfile.lock

Cargo.toml

@@ -23,8 +23,8 @@ unsafe_code = "forbid"
 
 [features]
 stage0 = []
-stage1 = []
-stage2 = []
-stage3 = []
-stage4 = []
-stage5 = []
+stage1 = ["stage0"]
+stage2 = ["stage1"]
+stage3 = ["stage2"]
+stage4 = ["stage3"]
+stage5 = ["stage4"]

Gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem 'toml-rb'

run_tests.rb

@@ -0,0 +1,28 @@
+require 'toml-rb'
+
+# Helper functions
+def ensure_build
+    system "cargo build --release"
+    if $?.exitstatus != 0
+        puts "Oops, we could not build the project!"
+        exit 1
+    end
+end
+
+def select_stage
+    path = File.join(File.dirname(__FILE__), 'Course.toml')
+    toml_data = TomlRB.load_file(path)
+    return toml_data['test']['level']
+end
+
+# Build the project
+puts "Building the project..."
+ensure_build
+
+# Run the tests
+puts "Running tests..."
+stage = select_stage
+system "cargo test --release --features stage#{stage}"
+
+# Congrats!
+puts "All Done!"

tests/helpers/mod.rs

@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 /// Splits the outbut by space, newline, tab or null characters
 pub fn split_ls_output(output: &[u8]) -> Vec<&str> {
     std::str::from_utf8(output)

tests/stage0.rs

@@ -9,5 +9,8 @@ fn test_stage_0() {
         .expect("failed to execute process");
 
     assert!(output.status.success());
-    assert_eq!(output.stdout, b"Hola Oxidar!\n")
+    assert_eq!(
+        std::str::from_utf8(&output.stdout).expect("a utf8 string output"),
+        "Hola Oxidar!\n"
+    )
 }

tests/stage4.rs

@@ -2,7 +2,6 @@
 
 mod helpers;
 
-use helpers::{split_ls_column_output, split_ls_output_by_newline};
 use rstest::rstest;
 use std::process::Command;
 

upgrade_stage.rb

@@ -0,0 +1,16 @@
+require 'toml-rb'
+
+# Load the toml file
+path = File.join(File.dirname(__FILE__), 'Course.toml')
+toml_data = TomlRB.load_file(path)
+
+# Upgrade the stage
+stage = toml_data['test']['level']
+next_stage = Integer(stage) + 1
+puts "Upgrading to stage #{next_stage}..."
+toml_data['test']['level'] = next_stage.to_s
+
+# Save the file
+data = TomlRB.dump(toml_data)
+File.write(path, data)
+puts "All done!"