From 05d5188ad14aa741a0a21cc60d2f40f1506dcfeb Mon Sep 17 00:00:00 2001
From: Olivier Tilloy <olivier@tilloy.net>
Date: Thu, 22 Feb 2024 17:15:03 +0100
Subject: [PATCH] Add integration tests that check the exit codes and
 stdout/stderr

---
 Cargo.lock           | 352 +++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml           |   3 +
 tests/integration.rs |  98 ++++++++++++
 3 files changed, 453 insertions(+)
 create mode 100644 tests/integration.rs

diff --git a/Cargo.lock b/Cargo.lock
index 2ae28d9..cf8f04f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,18 +2,180 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
+
+[[package]]
+name = "assert_cmd"
+version = "2.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed72493ac66d5804837f480ab3766c72bdfab91a65e565fc54fa9e42db0073a8"
+dependencies = [
+ "anstyle",
+ "bstr",
+ "doc-comment",
+ "predicates",
+ "predicates-core",
+ "predicates-tree",
+ "wait-timeout",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
+
+[[package]]
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+checksum = "c48f0051a4b4c5e0b6d365cd04af53aeaa209e3cc15ec2cdb69e73cc87fbd0dc"
+dependencies = [
+ "memchr",
+ "regex-automata",
+ "serde",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "diff"
 version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
 
+[[package]]
+name = "difflib"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6184e33543162437515c2e2b48714794e37845ec9851711914eec9d308f6ebe8"
+
 [[package]]
 name = "diffutils"
 version = "0.3.0"
 dependencies = [
+ "assert_cmd",
  "diff",
+ "predicates",
  "pretty_assertions",
+ "tempfile",
+]
+
+[[package]]
+name = "doc-comment"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
+
+[[package]]
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+checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
+dependencies = [
+ "libc",
+ "windows-sys",
+]
+
+[[package]]
+name = "fastrand"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25cbce373ec4653f1a01a31e8a5e5ec0c622dc27ff9c4e6606eefef5cbbed4a5"
+
+[[package]]
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+checksum = "98de4bbd547a563b716d8dfa9aad1cb19bfab00f4fa09a6a4ed21dbcf44ce9c4"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.153"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+
+[[package]]
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+
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+
+[[package]]
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+checksum = "61807f77802ff30975e01f4f071c8ba10c022052f98b3294119f3e615d13e5be"
+
+[[package]]
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+checksum = "da0df0e5185db44f69b44f26786fe401b6c293d1907744beaa7fa62b2e5a517a"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "predicates"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68b87bfd4605926cdfefc1c3b5f8fe560e3feca9d5552cf68c466d3d8236c7e8"
+dependencies = [
+ "anstyle",
+ "difflib",
+ "float-cmp",
+ "normalize-line-endings",
+ "predicates-core",
+ "regex",
+]
+
+[[package]]
+name = "predicates-core"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b794032607612e7abeb4db69adb4e33590fa6cf1149e95fd7cb00e634b92f174"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "368ba315fb8c5052ab692e68a0eefec6ec57b23a36959c14496f0b0df2c0cecf"
+dependencies = [
+ "predicates-core",
+ "termtree",
 ]
 
 [[package]]
@@ -26,6 +188,196 @@ dependencies = [
  "yansi",
 ]
 
+[[package]]
+name = "proc-macro2"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "regex"
+version = "1.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5bb987efffd3c6d0d8f5f89510bb458559eab11e4f869acb20bf845e016259cd"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
+
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+dependencies = [
+ "bitflags",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys",
+]
+
+[[package]]
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+]
+
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+dependencies = [
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+ "quote",
+ "syn",
+]
+
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+dependencies = [
+ "proc-macro2",
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+ "unicode-ident",
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+checksum = "a365e8cd18e44762ef95d87f284f4b5cd04107fec2ff3052bd6a3e6069669e67"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "rustix",
+ "windows-sys",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+checksum = "9f200f5b12eb75f8c1ed65abd4b2db8a6e1b138a20de009dacee265a2498f3f6"
+dependencies = [
+ "libc",
+]
+
+[[package]]
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+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
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+checksum = "d98532992affa02e52709d5b4d145a3668ae10d9081eea4a7f26f719a8476f71"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
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+[[package]]
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+[[package]]
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+[[package]]
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+checksum = "dc885a4332ee1afb9a1bacf11514801011725570d35675abc229ce7e3afe4d20"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e440c60457f84b0bee09208e62acc7ade264b38c4453f6312b8c9ab1613e73c"
+
 [[package]]
 name = "yansi"
 version = "0.5.1"
diff --git a/Cargo.toml b/Cargo.toml
index 984e4d9..f1c7b71 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,3 +19,6 @@ diff = "0.1.10"
 
 [dev-dependencies]
 pretty_assertions = "1"
+assert_cmd = "2.0.14"
+predicates = "3.1.0"
+tempfile = "3.10.0"
diff --git a/tests/integration.rs b/tests/integration.rs
new file mode 100644
index 0000000..f5768d0
--- /dev/null
+++ b/tests/integration.rs
@@ -0,0 +1,98 @@
+// This file is part of the uutils diffutils package.
+//
+// For the full copyright and license information, please view the LICENSE-*
+// files that was distributed with this source code.
+
+use assert_cmd::prelude::*;
+use predicates::prelude::*;
+use std::io::Write;
+use std::process::Command;
+use tempfile::NamedTempFile;
+
+// Integration tests for the diffutils command
+
+#[test]
+fn unknown_param() -> Result<(), Box<dyn std::error::Error>> {
+    let mut cmd = Command::cargo_bin("diffutils")?;
+    cmd.arg("--foobar");
+    cmd.assert()
+        .code(predicate::eq(2))
+        .failure()
+        .stderr(predicate::str::starts_with("Usage: "));
+    Ok(())
+}
+
+#[test]
+fn cannot_read_from_file() -> Result<(), Box<dyn std::error::Error>> {
+    let mut cmd = Command::cargo_bin("diffutils")?;
+    cmd.arg("foo.txt").arg("bar.txt");
+    cmd.assert()
+        .code(predicate::eq(2))
+        .failure()
+        .stderr(predicate::str::starts_with("Failed to read from-file"));
+    Ok(())
+}
+
+#[test]
+fn cannot_read_to_file() -> Result<(), Box<dyn std::error::Error>> {
+    let file = NamedTempFile::new()?;
+    let mut cmd = Command::cargo_bin("diffutils")?;
+    cmd.arg(file.path()).arg("bar.txt");
+    cmd.assert()
+        .code(predicate::eq(2))
+        .failure()
+        .stderr(predicate::str::starts_with("Failed to read to-file"));
+    Ok(())
+}
+
+#[test]
+fn no_differences() -> Result<(), Box<dyn std::error::Error>> {
+    let file = NamedTempFile::new()?;
+    for option in ["", "-u", "-c", "-e"] {
+        let mut cmd = Command::cargo_bin("diffutils")?;
+        if !option.is_empty() {
+            cmd.arg(option);
+        }
+        cmd.arg(file.path()).arg(file.path());
+        cmd.assert()
+            .code(predicate::eq(0))
+            .success()
+            .stdout(predicate::str::is_empty());
+    }
+    Ok(())
+}
+
+#[test]
+fn differences() -> Result<(), Box<dyn std::error::Error>> {
+    let mut file1 = NamedTempFile::new()?;
+    file1.write_all("foo\n".as_bytes())?;
+    let mut file2 = NamedTempFile::new()?;
+    file2.write_all("bar\n".as_bytes())?;
+    for option in ["", "-u", "-c", "-e"] {
+        let mut cmd = Command::cargo_bin("diffutils")?;
+        if !option.is_empty() {
+            cmd.arg(option);
+        }
+        cmd.arg(file1.path()).arg(file2.path());
+        cmd.assert()
+            .code(predicate::eq(1))
+            .failure()
+            .stdout(predicate::str::is_empty().not());
+    }
+    Ok(())
+}
+
+#[test]
+fn missing_newline() -> Result<(), Box<dyn std::error::Error>> {
+    let mut file1 = NamedTempFile::new()?;
+    file1.write_all("foo".as_bytes())?;
+    let mut file2 = NamedTempFile::new()?;
+    file2.write_all("bar".as_bytes())?;
+    let mut cmd = Command::cargo_bin("diffutils")?;
+    cmd.arg("-e").arg(file1.path()).arg(file2.path());
+    cmd.assert()
+        .code(predicate::eq(2))
+        .failure()
+        .stderr(predicate::str::starts_with("No newline at end of file"));
+    Ok(())
+}