Added some end-user "sanity" tests

tests/integration_tests.rs

@@ -0,0 +1,197 @@
+/// Tests which exercise the overall application, in particular the `MDBook`
+/// initialization and build/rendering process.
+///
+/// This will create an entire book in a temporary directory using some
+/// dummy content.
+
+extern crate mdbook;
+extern crate tempdir;
+extern crate env_logger;
+
+use std::path::Path;
+use std::fs::{self, File};
+use std::io::{Read, Write};
+
+use tempdir::TempDir;
+use mdbook::MDBook;
+
+
+const SUMMARY_MD: &'static str = "# Summary
+
+[Introduction](intro.md)
+
+- [First Chapter](./first/index.md)
+    - [Nested Chapter](./first/nested.md)
+- [Second Chapter](./second.md)
+
+[Conclusion](./conclusion.md)
+";
+
+const INTRO: &'static str = "# Introduction
+
+Here's some interesting text...";
+
+const FIRST: &'static str = "# First Chapter
+
+more text.";
+
+const NESTED: &'static str = r#"# Nested Chapter
+
+This file has some testable code.
+
+```rust
+assert!($TEST_STATUS);
+```"#;
+
+const SECOND: &'static str = "# Second Chapter";
+
+const CONCLUSION: &'static str = "# Conclusion";
+
+#[test]
+fn build_the_dummy_book() {
+    let temp = create_book(true);
+    let mut md = MDBook::new(temp.path());
+
+    md.build().unwrap();
+}
+
+#[test]
+fn mdbook_can_correctly_test_a_passing_book() {
+    let temp = create_book(true);
+    let mut md = MDBook::new(temp.path());
+
+    assert!(md.test().is_ok());
+}
+
+#[test]
+fn mdbook_detects_book_with_failing_tests() {
+    let temp = create_book(false);
+    let mut md = MDBook::new(temp.path());
+
+    assert!(md.test().is_err());
+}
+
+#[test]
+fn by_default_mdbook_generates_rendered_content_in_the_book_directory() {
+    let temp = create_book(false);
+    let mut md = MDBook::new(temp.path());
+
+    assert!(!temp.path().join("book").exists());
+    md.build().unwrap();
+
+    assert!(temp.path().join("book").exists());
+    assert!(temp.path().join("book").join("index.html").exists());
+}
+
+#[test]
+fn make_sure_bottom_level_files_contain_links_to_chapters() {
+    let temp = create_book(false);
+    let mut md = MDBook::new(temp.path());
+    md.build().unwrap();
+
+    let dest = temp.path().join("book");
+    let links = vec![
+        "intro.html",
+        "first/index.html",
+        "first/nested.html",
+        "second.html",
+        "conclusion.html",
+    ];
+
+    let files_in_bottom_dir = vec!["index.html", "intro.html", "second.html", "conclusion.html"];
+
+    for filename in files_in_bottom_dir {
+        assert_contains_strings(dest.join(filename), &links);
+    }
+}
+
+#[test]
+fn check_correct_cross_links_in_nested_dir() {
+    let temp = create_book(false);
+    let mut md = MDBook::new(temp.path());
+    md.build().unwrap();
+
+    let first = temp.path().join("book").join("first");
+    let links = vec![
+        r#"<base href="../">"#,
+        "intro.html",
+        "first/index.html",
+        "first/nested.html",
+        "second.html",
+        "conclusion.html",
+    ];
+
+    let files_in_nested_dir = vec!["index.html", "nested.html"];
+
+    for filename in files_in_nested_dir {
+        assert_contains_strings(first.join(filename), &links);
+    }
+}
+
+/// Create a dummy book in a temporary directory, using the contents of
+/// `SUMMARY_MD` as a guide.
+///
+/// The "Nested Chapter" file contains a code block with a single
+/// `assert!($TEST_STATUS)`. If you want to check MDBook's testing
+/// functionality, `$TEST_STATUS` can be substitute for either `true` or
+/// `false`. This is done using the `passing_test` parameter.
+fn create_book(passing_test: bool) -> TempDir {
+    let temp = TempDir::new("dummy_book").unwrap();
+
+    let src = temp.path().join("src");
+    fs::create_dir_all(&src).unwrap();
+
+    File::create(src.join("SUMMARY.md"))
+        .unwrap()
+        .write_all(SUMMARY_MD.as_bytes())
+        .unwrap();
+    File::create(src.join("intro.md"))
+        .unwrap()
+        .write_all(INTRO.as_bytes())
+        .unwrap();
+
+    let first = src.join("first");
+    fs::create_dir_all(&first).unwrap();
+    File::create(first.join("index.md"))
+        .unwrap()
+        .write_all(FIRST.as_bytes())
+        .unwrap();
+
+    let to_substitute = if passing_test { "true" } else { "false" };
+    let nested_text = NESTED.replace("$TEST_STATUS", to_substitute);
+    File::create(first.join("nested.md"))
+        .unwrap()
+        .write_all(nested_text.as_bytes())
+        .unwrap();
+
+    File::create(src.join("second.md"))
+        .unwrap()
+        .write_all(SECOND.as_bytes())
+        .unwrap();
+    File::create(src.join("conclusion.md"))
+        .unwrap()
+        .write_all(CONCLUSION.as_bytes())
+        .unwrap();
+
+    temp
+}
+
+fn assert_contains_strings<P: AsRef<Path>>(filename: P, strings: &[&str]) {
+    println!("Checking {}", filename.as_ref().display());
+    println!();
+
+    let mut content = String::new();
+    File::open(filename)
+        .expect("Couldn't open the provided file")
+        .read_to_string(&mut content)
+        .unwrap();
+
+    println!("{}", content);
+    println!();
+    println!();
+
+    for s in strings {
+        println!("Checking for {:?}", s);
+        assert!(content.contains(s));
+    }
+}