test: make sure do not ignore the UI tests (#494)

Found a problem with the test in https://github.com/tokio-rs/console/actions/runs/6988785469/job/19016699616?pr=493.

If the binary does not exist, it will ignore the test cases.

After this change, it will bail out an error.

I moved it to integration tests dir, we don't need to build the binary manually.

README.md

@@ -171,7 +171,7 @@ flags and arguments:
 $ tokio-console --help
 The Tokio console: a debugger for async Rust.
 
-Usage: tokio-console [OPTIONS] [TARGET_ADDR] [COMMAND]
+Usage: tokio-console[EXE] [OPTIONS] [TARGET_ADDR] [COMMAND]
 
 Commands:
   gen-config

tokio-console/src/config.rs

@@ -778,18 +778,6 @@ mod tests {
         Config::command().debug_assert()
     }
 
-    #[test]
-    // You can use `TRYCMD=overwrite` to overwrite the expected output.
-    fn cli_tests() {
-        // 72 chars seems to fit reasonably in the default width of
-        // RustDoc's code formatting
-        // Set the env var COLUMNS to override this.
-        env::set_var("COLUMNS", "72");
-        trycmd::TestCases::new()
-            .case("cli-ui.toml")
-            .case("../README.md");
-    }
-
     #[test]
     // The example output includes paths, so skip this test on windows. :/
     #[cfg_attr(windows, ignore)]

tokio-console/src/lib.rs

@@ -12,7 +12,7 @@
 /// `tokio-console`:
 ///
 /// ```text
-#[doc = include_str!("../cli-ui.stdout")]
+#[doc = include_str!("../tests/cli-ui.stdout")]
 /// ```
 ///
 /// This text can also be displayed by running `tokio-console help`.

tokio-console/tests/cli-ui.rs

@@ -0,0 +1,23 @@
+use std::env;
+
+#[test]
+// You can use `TRYCMD=overwrite` to overwrite the expected output.
+fn cli_tests() {
+    // 72 chars seems to fit reasonably in the default width of
+    // RustDoc's code formatting
+    // Set the env var COLUMNS to override this.
+    env::set_var("COLUMNS", "72");
+    // The following might be changed by the test runner, so we
+    // explicitly set them to known values.
+    env::set_var("LANG", "en_US.UTF-8");
+    env::set_var("COLORTERM", "truecolor");
+
+    let t = trycmd::TestCases::new();
+    let console = trycmd::cargo::cargo_bin("tokio-console");
+    t.register_bin("tokio-console", console);
+    let readme_path = std::path::Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap())
+        .parent()
+        .expect("README.md exists in the root of the repo")
+        .join("README.md");
+    t.case("tests/cli-ui.toml").case(readme_path);
+}

tokio-console/cli-ui.stdout → tokio-console/tests/cli-ui.stdout

@@ -1,6 +1,6 @@
 The Tokio console: a debugger for async Rust.
 
-Usage: tokio-console [OPTIONS] [TARGET_ADDR] [COMMAND]
+Usage: tokio-console[EXE] [OPTIONS] [TARGET_ADDR] [COMMAND]
 
 Commands:
   gen-config