coverage: Remove some old low-value unit tests for graph traversal

These tests might have originally been useful as an implementation aid, but now
they don't provide enough value to justify the burden of updating them as the
underlying code changes.

The code they test is still exercised by the main end-to-end coverage tests.

compiler/rustc_mir_transform/src/coverage/counters.rs

@@ -168,11 +168,6 @@ impl CoverageCounters {
         self.counter_increment_sites.len()
     }
 
-    #[cfg(test)]
-    pub(super) fn num_expressions(&self) -> usize {
-        self.expressions.len()
-    }
-
     fn set_bcb_counter(&mut self, bcb: BasicCoverageBlock, counter_kind: BcbCounter) -> BcbCounter {
         if let Some(replaced) = self.bcb_counters[bcb].replace(counter_kind) {
             bug!(

compiler/rustc_mir_transform/src/coverage/tests.rs

@@ -24,7 +24,6 @@
 //! globals is comparatively simpler. The easiest way is to wrap the test in a closure argument
 //! to: `rustc_span::create_default_session_globals_then(|| { test_here(); })`.
 
-use super::counters;
 use super::graph::{self, BasicCoverageBlock};
 
 use itertools::Itertools;
@@ -551,108 +550,3 @@ fn test_covgraph_switchint_loop_then_inner_loop_else_break() {
     assert_successors(&basic_coverage_blocks, bcb(5), &[bcb(1)]);
     assert_successors(&basic_coverage_blocks, bcb(6), &[bcb(4)]);
 }
-
-#[test]
-fn test_find_loop_backedges_none() {
-    let mir_body = goto_switchint();
-    let basic_coverage_blocks = graph::CoverageGraph::from_mir(&mir_body);
-    if false {
-        eprintln!(
-            "basic_coverage_blocks = {:?}",
-            basic_coverage_blocks.iter_enumerated().collect::<Vec<_>>()
-        );
-        eprintln!("successors = {:?}", basic_coverage_blocks.successors);
-    }
-    let backedges = graph::find_loop_backedges(&basic_coverage_blocks);
-    assert_eq!(
-        backedges.iter_enumerated().map(|(_bcb, backedges)| backedges.len()).sum::<usize>(),
-        0,
-        "backedges: {:?}",
-        backedges
-    );
-}
-
-#[test]
-fn test_find_loop_backedges_one() {
-    let mir_body = switchint_then_loop_else_return();
-    let basic_coverage_blocks = graph::CoverageGraph::from_mir(&mir_body);
-    let backedges = graph::find_loop_backedges(&basic_coverage_blocks);
-    assert_eq!(
-        backedges.iter_enumerated().map(|(_bcb, backedges)| backedges.len()).sum::<usize>(),
-        1,
-        "backedges: {:?}",
-        backedges
-    );
-
-    assert_eq!(backedges[bcb(1)], &[bcb(3)]);
-}
-
-#[test]
-fn test_find_loop_backedges_two() {
-    let mir_body = switchint_loop_then_inner_loop_else_break();
-    let basic_coverage_blocks = graph::CoverageGraph::from_mir(&mir_body);
-    let backedges = graph::find_loop_backedges(&basic_coverage_blocks);
-    assert_eq!(
-        backedges.iter_enumerated().map(|(_bcb, backedges)| backedges.len()).sum::<usize>(),
-        2,
-        "backedges: {:?}",
-        backedges
-    );
-
-    assert_eq!(backedges[bcb(1)], &[bcb(5)]);
-    assert_eq!(backedges[bcb(4)], &[bcb(6)]);
-}
-
-#[test]
-fn test_traverse_coverage_with_loops() {
-    let mir_body = switchint_loop_then_inner_loop_else_break();
-    let basic_coverage_blocks = graph::CoverageGraph::from_mir(&mir_body);
-    let mut traversed_in_order = Vec::new();
-    let mut traversal = graph::TraverseCoverageGraphWithLoops::new(&basic_coverage_blocks);
-    while let Some(bcb) = traversal.next() {
-        traversed_in_order.push(bcb);
-    }
-
-    // bcb0 is visited first. Then bcb1 starts the first loop, and all remaining nodes, *except*
-    // bcb6 are inside the first loop.
-    assert_eq!(
-        *traversed_in_order.last().expect("should have elements"),
-        bcb(6),
-        "bcb6 should not be visited until all nodes inside the first loop have been visited"
-    );
-}
-
-#[test]
-fn test_make_bcb_counters() {
-    rustc_span::create_default_session_globals_then(|| {
-        let mir_body = goto_switchint();
-        let basic_coverage_blocks = graph::CoverageGraph::from_mir(&mir_body);
-        // Historically this test would use `spans` internals to set up fake
-        // coverage spans for BCBs 1 and 2. Now we skip that step and just tell
-        // BCB counter construction that those BCBs have spans.
-        let bcb_has_coverage_spans = |bcb: BasicCoverageBlock| (1..=2).contains(&bcb.as_usize());
-        let coverage_counters = counters::CoverageCounters::make_bcb_counters(
-            &basic_coverage_blocks,
-            bcb_has_coverage_spans,
-        );
-        assert_eq!(coverage_counters.num_expressions(), 0);
-
-        assert_eq!(
-            0, // bcb1 has a `Counter` with id = 0
-            match coverage_counters.bcb_counter(bcb(1)).expect("should have a counter") {
-                counters::BcbCounter::Counter { id, .. } => id,
-                _ => panic!("expected a Counter"),
-            }
-            .as_u32()
-        );
-
-        assert_eq!(
-            1, // bcb2 has a `Counter` with id = 1
-            match coverage_counters.bcb_counter(bcb(2)).expect("should have a counter") {
-                counters::BcbCounter::Counter { id, .. } => id,
-                _ => panic!("expected a Counter"),
-            }
-            .as_u32()
-        );
-    });
-}