Remove clap validator + add max-filesize integration tests

tests/tests.rs

@@ -444,6 +444,51 @@ sherlock!(max_filesize_parse_error_suffix, "Sherlock", ".",
     wd.assert_err(&mut cmd);
 });
 
+sherlock!(max_filesize_parse_no_suffix, "Sherlock", ".",
+|wd: WorkDir, mut cmd: Command| {
+    wd.remove("sherlock");
+    wd.create_size("foo", 40);
+    wd.create_size("bar", 60);
+
+    cmd.arg("--max-filesize").arg("50").arg("--files");
+    let lines: String = wd.stdout(&mut cmd);
+    let expected = "\
+foo
+";
+
+    assert_eq!(lines, expected);
+});
+
+sherlock!(max_filesize_parse_k_suffix, "Sherlock", ".",
+|wd: WorkDir, mut cmd: Command| {
+    wd.remove("sherlock");
+    wd.create_size("foo", 3048);
+    wd.create_size("bar", 4100);
+
+    cmd.arg("--max-filesize").arg("4K").arg("--files");
+    let lines: String = wd.stdout(&mut cmd);
+    let expected = "\
+foo
+";
+
+    assert_eq!(lines, expected);
+});
+
+sherlock!(max_filesize_parse_m_suffix, "Sherlock", ".",
+|wd: WorkDir, mut cmd: Command| {
+    wd.remove("sherlock");
+    wd.create_size("foo", 1000000);
+    wd.create_size("bar", 1400000);
+
+    cmd.arg("--max-filesize").arg("1M").arg("--files");
+    let lines: String = wd.stdout(&mut cmd);
+    let expected = "\
+foo
+";
+
+    assert_eq!(lines, expected);
+});
+
 sherlock!(ignore_hidden, "Sherlock", ".", |wd: WorkDir, mut cmd: Command| {
     wd.remove("sherlock");
     wd.create(".sherlock", hay::SHERLOCK);

tests/workdir.rs

@@ -46,6 +46,13 @@ impl WorkDir {
         self.create_bytes(name, contents.as_bytes());
     }
 
+    /// Create a new file with the given name and size.
+    pub fn create_size<P: AsRef<Path>>(&self, name: P, filesize: u64) {
+        let path = self.dir.join(name);
+        let file = nice_err(&path, File::create(&path));
+        nice_err(&path, file.set_len(filesize));
+    }
+
     /// Create a new file with the given name and contents in this directory.
     pub fn create_bytes<P: AsRef<Path>>(&self, name: P, contents: &[u8]) {
         let path = self.dir.join(name);