test: add no_std compatibly test crate

Signed-off-by: Tom Dohrmann <[email protected]>

test/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "test"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

test/src/lib.rs

@@ -0,0 +1,46 @@
+//! This crate contains a very stripped down copy of the `test` crate.
+//! `test` usually requires full `std` support, but we need to use it from a
+//! `no_std` target.
+//! The `test` crate is implicitly used by the `#[test]` attribute.
+#![no_std]
+
+#[derive(Clone, Copy)]
+pub struct TestDescAndFn {
+    pub testfn: StaticTestFn,
+    pub desc: TestDesc,
+}
+
+#[derive(Clone, Copy)]
+pub struct StaticTestFn(pub fn());
+
+#[derive(Clone, Copy)]
+pub struct TestDesc {
+    pub name: StaticTestName,
+    pub ignore: bool,
+    pub ignore_message: Option<&'static str>,
+    pub source_file: &'static str,
+    pub start_line: usize,
+    pub start_col: usize,
+    pub end_line: usize,
+    pub end_col: usize,
+    pub should_panic: ShouldPanic,
+    pub compile_fail: bool,
+    pub no_run: bool,
+    pub test_type: TestType,
+}
+
+#[derive(Clone, Copy)]
+pub struct StaticTestName(pub &'static str);
+
+#[derive(Clone, Copy)]
+pub enum TestType {
+    UnitTest,
+}
+
+#[derive(PartialEq, Eq, Clone, Copy)]
+pub enum ShouldPanic {
+    Yes,
+    No,
+}
+
+pub fn assert_test_result(_: ()) {}