test(clap_complete): Add test cases for --flag bar and -f bar co…

…mpletion

clap_complete/tests/testsuite/dynamic.rs

@@ -9,7 +9,7 @@ macro_rules! complete {
     ($cmd:expr, $input:expr$(, current_dir = $current_dir:expr)? $(,)?) => {
         {
             #[allow(unused)]
-            let current_dir = None;
+            let current_dir: Option<&Path> = None;
             $(let current_dir = $current_dir;)?
             complete(&mut $cmd, $input, current_dir)
         }
@@ -132,6 +132,118 @@ goodbye-world"
     );
 }
 
+#[test]
+fn suggest_argument_value() {
+    let mut cmd = Command::new("dynamic")
+    .arg(
+        clap::Arg::new("input")
+            .long("input")
+            .short('i')
+            .value_hint(clap::ValueHint::FilePath),
+    )
+    .arg(
+        clap::Arg::new("format")
+            .long("format")
+            .short('F')
+            .value_parser(["json", "yaml", "toml"]),
+    )
+    .args_conflicts_with_subcommands(true);
+
+    {
+        use std::fs;
+
+        let testdir = snapbox::dir::DirRoot::mutable_temp().unwrap();
+        let testdir_path = testdir.path().unwrap();
+
+		fs::write(testdir_path.join("a_file"), "").unwrap();
+		fs::write(testdir_path.join("b_file"), "").unwrap();
+		fs::create_dir(testdir_path.join("c_dir")).unwrap();
+		fs::create_dir(testdir_path.join("d_dir")).unwrap();
+
+        assert_data_eq!(
+            complete!(cmd, "--input [TAB]", current_dir = Some(testdir_path)),
+            snapbox::str![
+                "a_file
+b_file
+c_dir/
+d_dir/"
+            ],
+        );
+
+        assert_data_eq!(
+            complete!(cmd, "-i [TAB]", current_dir = Some(testdir_path)),
+            snapbox::str![
+                "a_file
+b_file
+c_dir/
+d_dir/"
+            ],
+        );
+
+        assert_data_eq!(
+            complete!(cmd, "--input a[TAB]", current_dir = Some(testdir_path)),
+            snapbox::str![
+                "a_file"
+            ],
+        );
+
+        assert_data_eq!(
+            complete!(cmd, "-i b[TAB]", current_dir = Some(testdir_path)),
+            snapbox::str![
+                "b_file"
+            ],
+        );
+    }
+
+
+
+    assert_data_eq!(
+        complete!(cmd, "--format [TAB]"),
+        snapbox::str![
+            "json
+yaml
+toml"
+        ],
+    );
+
+    assert_data_eq!(
+        complete!(cmd, "-F [TAB]"),
+        snapbox::str![
+            "json
+yaml
+toml"
+        ],
+    );
+
+    assert_data_eq!(
+        complete!(cmd, "--format j[TAB]"),
+        snapbox::str![
+            "json"
+        ],
+    );
+
+    assert_data_eq!(
+        complete!(cmd, "-F j[TAB]"),
+        snapbox::str![
+            "json"
+        ],
+    );
+
+    assert_data_eq!(
+        complete!(cmd, "--format t[TAB]"),
+        snapbox::str![
+            "toml"
+        ],
+    );
+
+    assert_data_eq!(
+        complete!(cmd, "-F t[TAB]"),
+        snapbox::str![
+            "toml"
+        ],
+    );
+}
+
 fn complete(cmd: &mut Command, args: impl AsRef<str>, current_dir: Option<&Path>) -> String {
     let input = args.as_ref();
     let mut args = vec![std::ffi::OsString::from(cmd.get_name())];