Migrate most of the existing coverage tests over to `run-coverage`

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/run-coverage/assert.rs b/tests/run-coverage/assert.rs
new file mode 100644
index 00000000000..d32a37e078e
--- /dev/null
+++ b/tests/run-coverage/assert.rs
@@ -0,0 +1,32 @@
+#![allow(unused_assignments)]
+// failure-status: 101
+
+fn might_fail_assert(one_plus_one: u32) {
+    println!("does 1 + 1 = {}?", one_plus_one);
+    assert_eq!(1 + 1, one_plus_one, "the argument was wrong");
+}
+
+fn main() -> Result<(),u8> {
+    let mut countdown = 10;
+    while countdown > 0 {
+        if countdown == 1 {
+            might_fail_assert(3);
+        } else if countdown < 5 {
+            might_fail_assert(2);
+        }
+        countdown -= 1;
+    }
+    Ok(())
+}
+
+// Notes:
+//   1. Compare this program and its coverage results to those of the very similar test
+//      `panic_unwind.rs`, and similar tests `abort.rs` and `try_error_result.rs`.
+//   2. This test confirms the coverage generated when a program passes or fails an `assert!()` or
+//      related `assert_*!()` macro.
+//   3. Notably, the `assert` macros *do not* generate `TerminatorKind::Assert`. The macros produce
+//      conditional expressions, `TerminatorKind::SwitchInt` branches, and a possible call to
+//      `begin_panic_fmt()` (that begins a panic unwind, if the assertion test fails).
+//   4. `TerminatoKind::Assert` is, however, also present in the MIR generated for this test
+//      (and in many other coverage tests). The `Assert` terminator is typically generated by the
+//      Rust compiler to check for runtime failures, such as numeric overflows.