Feat(testing and infra): skeleton for catr library

tests/cli.rs

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+use assert_cmd::Command;
+use predicates::prelude::*;
+use rand::{distributions::Alphanumeric, Rng};
+use std::error::Error;
+use std::fs;
+
+type TestResult = Result<(), Box<dyn Error>>;
+
+const PRG: &str = "catr";
+const EMPTY: &str = "tests/inputs/empty.txt";
+const FOX: &str = "tests/inputs/fox.txt";
+const SPIDERS: &str = "tests/inputs/spiders.txt";
+const BUSTLE: &str = "tests/inputs/the-bustle.txt";
+
+// --------------------------------------------------
+#[test]
+fn usage() -> TestResult {
+    for flag in &["-h", "--help"] {
+        Command::cargo_bin(PRG)?
+            .arg(flag)
+            .assert()
+            .stdout(predicate::str::contains("USAGE"));
+    }
+    Ok(())
+}
+
+// --------------------------------------------------
+fn gen_bad_file() -> String {
+    loop {
+        let filename: String = rand::thread_rng()
+            .sample_iter(&Alphanumeric)
+            .take(7)
+            .map(char::from)
+            .collect();
+
+        if fs::metadata(&filename).is_err() {
+            return filename;
+        }
+    }
+}
+
+// --------------------------------------------------
+#[test]
+fn skips_bad_file() -> TestResult {
+    let bad = gen_bad_file();
+    let expected = format!("{}: .* [(]os error 2[)]", bad);
+    Command::cargo_bin(PRG)?
+        .arg(&bad)
+        .assert()
+        .success()
+        .stderr(predicate::str::is_match(expected)?);
+    Ok(())
+}
+
+// --------------------------------------------------
+fn run(args: &[&str], expected_file: &str) -> TestResult {
+    let expected = fs::read_to_string(expected_file)?;
+    Command::cargo_bin(PRG)?
+        .args(args)
+        .assert()
+        .success()
+        .stdout(expected);
+    Ok(())
+}
+
+// --------------------------------------------------
+fn run_stdin(
+    input_file: &str,
+    args: &[&str],
+    expected_file: &str,
+) -> TestResult {
+    let input = fs::read_to_string(input_file)?;
+    let expected = fs::read_to_string(expected_file)?;
+    Command::cargo_bin(PRG)?
+        .args(args)
+        .write_stdin(input)
+        .assert()
+        .success()
+        .stdout(expected);
+    Ok(())
+}
+
+// --------------------------------------------------
+#[test]
+fn bustle_stdin() -> TestResult {
+    run_stdin(BUSTLE, &["-"], "tests/expected/the-bustle.txt.stdin.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn bustle_stdin_n() -> TestResult {
+    run_stdin(
+        BUSTLE,
+        &["-n", "-"],
+        "tests/expected/the-bustle.txt.n.stdin.out",
+    )
+}
+
+// --------------------------------------------------
+#[test]
+fn bustle_stdin_b() -> TestResult {
+    run_stdin(
+        BUSTLE,
+        &["-b", "-"],
+        "tests/expected/the-bustle.txt.b.stdin.out",
+    )
+}
+
+// --------------------------------------------------
+#[test]
+fn empty() -> TestResult {
+    run(&[EMPTY], "tests/expected/empty.txt.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn empty_n() -> TestResult {
+    run(&["-n", EMPTY], "tests/expected/empty.txt.n.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn empty_b() -> TestResult {
+    run(&["-b", EMPTY], "tests/expected/empty.txt.b.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn fox() -> TestResult {
+    run(&[FOX], "tests/expected/fox.txt.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn fox_n() -> TestResult {
+    run(&["-n", FOX], "tests/expected/fox.txt.n.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn fox_b() -> TestResult {
+    run(&["-b", FOX], "tests/expected/fox.txt.b.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn spiders() -> TestResult {
+    run(&[SPIDERS], "tests/expected/spiders.txt.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn spiders_n() -> TestResult {
+    run(&["--number", SPIDERS], "tests/expected/spiders.txt.n.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn spiders_b() -> TestResult {
+    run(
+        &["--number-nonblank", SPIDERS],
+        "tests/expected/spiders.txt.b.out",
+    )
+}
+
+// --------------------------------------------------
+#[test]
+fn bustle() -> TestResult {
+    run(&[BUSTLE], "tests/expected/the-bustle.txt.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn bustle_n() -> TestResult {
+    run(&["-n", BUSTLE], "tests/expected/the-bustle.txt.n.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn bustle_b() -> TestResult {
+    run(&["-b", BUSTLE], "tests/expected/the-bustle.txt.b.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn all() -> TestResult {
+    run(&[FOX, SPIDERS, BUSTLE], "tests/expected/all.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn all_n() -> TestResult {
+    run(&[FOX, SPIDERS, BUSTLE, "-n"], "tests/expected/all.n.out")
+}
+
+// --------------------------------------------------
+#[test]
+fn all_b() -> TestResult {
+    run(&[FOX, SPIDERS, BUSTLE, "-b"], "tests/expected/all.b.out")
+}

tests/expected/all.b.out

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+     1	The quick brown fox jumps over the lazy dog.
+     1	Don't worry, spiders,
+     2	I keep house
+     3	casually.
+     1	The bustle in a house
+     2	The morning after death
+     3	Is solemnest of industries
+     4	Enacted upon earth,—
+
+     5	The sweeping up the heart,
+     6	And putting love away
+     7	We shall not want to use again
+     8	Until eternity.

tests/expected/all.n.out

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+     1	The quick brown fox jumps over the lazy dog.
+     1	Don't worry, spiders,
+     2	I keep house
+     3	casually.
+     1	The bustle in a house
+     2	The morning after death
+     3	Is solemnest of industries
+     4	Enacted upon earth,—
+     5	
+     6	The sweeping up the heart,
+     7	And putting love away
+     8	We shall not want to use again
+     9	Until eternity.

tests/expected/all.out

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+The quick brown fox jumps over the lazy dog.
+Don't worry, spiders,
+I keep house
+casually.
+The bustle in a house
+The morning after death
+Is solemnest of industries
+Enacted upon earth,—
+
+The sweeping up the heart,
+And putting love away
+We shall not want to use again
+Until eternity.

tests/expected/fox.txt.b.out

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+     1	The quick brown fox jumps over the lazy dog.

tests/expected/fox.txt.n.out

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+     1	The quick brown fox jumps over the lazy dog.

tests/expected/fox.txt.out

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+The quick brown fox jumps over the lazy dog.

tests/expected/spiders.txt.b.out

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+     1	Don't worry, spiders,
+     2	I keep house
+     3	casually.

tests/expected/spiders.txt.n.out

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+     1	Don't worry, spiders,
+     2	I keep house
+     3	casually.

tests/expected/spiders.txt.out

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+Don't worry, spiders,
+I keep house
+casually.

tests/expected/the-bustle.txt.b.out

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+     1	The bustle in a house
+     2	The morning after death
+     3	Is solemnest of industries
+     4	Enacted upon earth,—
+
+     5	The sweeping up the heart,
+     6	And putting love away
+     7	We shall not want to use again
+     8	Until eternity.

tests/expected/the-bustle.txt.b.stdin.out

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+     1	The bustle in a house
+     2	The morning after death
+     3	Is solemnest of industries
+     4	Enacted upon earth,—
+
+     5	The sweeping up the heart,
+     6	And putting love away
+     7	We shall not want to use again
+     8	Until eternity.

tests/expected/the-bustle.txt.n.out

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+     1	The bustle in a house
+     2	The morning after death
+     3	Is solemnest of industries
+     4	Enacted upon earth,—
+     5	
+     6	The sweeping up the heart,
+     7	And putting love away
+     8	We shall not want to use again
+     9	Until eternity.

tests/expected/the-bustle.txt.n.stdin.out

@@ -0,0 +1,9 @@
+     1	The bustle in a house
+     2	The morning after death
+     3	Is solemnest of industries
+     4	Enacted upon earth,—
+     5	
+     6	The sweeping up the heart,
+     7	And putting love away
+     8	We shall not want to use again
+     9	Until eternity.

tests/expected/the-bustle.txt.out

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+The bustle in a house
+The morning after death
+Is solemnest of industries
+Enacted upon earth,—
+
+The sweeping up the heart,
+And putting love away
+We shall not want to use again
+Until eternity.

tests/expected/the-bustle.txt.stdin.out

@@ -0,0 +1,9 @@
+The bustle in a house
+The morning after death
+Is solemnest of industries
+Enacted upon earth,—
+
+The sweeping up the heart,
+And putting love away
+We shall not want to use again
+Until eternity.