Add test test_discovery_logfile_format().

Author: aspotashev

library/test/src/tests.rs

@@ -5,6 +5,7 @@ use std::path::PathBuf;
 use super::*;
 
 use crate::{
+    console::list_tests_console,
     console::OutputLocation,
     formatters::PrettyFormatter,
     test::{
@@ -957,6 +958,46 @@ fn test_dyn_bench_returning_err_fails_when_run_as_test() {
     assert_eq!(result, TrFailed);
 }
 
+#[test]
+fn test_discovery_logfile_format() {
+    let desc = TestDescAndFn {
+        desc: TestDesc {
+            name: StaticTestName("whatever"),
+            ignore: false,
+            ignore_message: None,
+            source_file: "",
+            start_line: 0,
+            start_col: 0,
+            end_line: 0,
+            end_col: 0,
+            should_panic: ShouldPanic::No,
+            compile_fail: false,
+            no_run: false,
+            test_type: TestType::Unknown,
+        },
+        testfn: DynTestFn(Box::new(move || Ok(()))),
+    };
+
+    let tmpdir = tmpdir();
+    let output_path = &tmpdir.join("output.txt");
+
+    let opts = TestOpts {
+        run_tests: true,
+        logfile: Some(output_path.clone()),
+        format: OutputFormat::Pretty,
+        list: true,
+        ..TestOpts::new()
+    };
+    list_tests_console(&opts, vec![desc]).unwrap();
+
+    let contents = fs::read_to_string(output_path).expect("`--logfile` did not create file");
+
+    // Split output at line breaks to make the comparison platform-agnostic regarding newline style.
+    let contents_lines = contents.as_str().lines().collect::<Vec<&str>>();
+
+    assert_eq!(contents_lines, vec!["test whatever"]);
+}
+
 #[test]
 fn test_logfile_format() {
     let desc = TestDescAndFn {