Allow testing for intentional leaks in test runner

Adds `expect_leak_or_bad_free :: proc(t: ^T, client_test: proc(t: ^T), verifier: Memory_Verifier_Proc)`.

It sets up its own `Tracking_Allocator`, runs the `client_test`, and then calls the `verifier` procedure.
The verifier can then inspect the contents of the tracking allocator and call `testing.expect*` as sensible for the test in question.

Any allocations are then cleared so that the test runner doesn't itself complain about leaks.

Additionally, `ODIN_TEST_LOG_LEVEL_MEMORY` has been added as a define to set the severity of the test runner's memory tracker. You can use `-define:ODIN_TEST_LOG_LEVEL_MEMORY=error` to make tests fail rather than warn if leaks or bad frees have been found.

1 files changed, 35 insertions, 3 deletions

diff --git a/core/testing/runner.odin b/core/testing/runner.odin
index 16967e3c7..5482d93e3 100644
--- a/core/testing/runner.odin
+++ b/core/testing/runner.odin
@@ -25,6 +25,8 @@ TEST_THREADS          : int    : #config(ODIN_TEST_THREADS, 0)
 TRACKING_MEMORY       : bool   : #config(ODIN_TEST_TRACK_MEMORY, true)
 // Always report how much memory is used, even when there are no leaks or bad frees.
 ALWAYS_REPORT_MEMORY  : bool   : #config(ODIN_TEST_ALWAYS_REPORT_MEMORY, false)
+// Log level for memory leaks and bad frees: debug, info, warning, error, fatal
+LOG_LEVEL_MEMORY      : string : #config(ODIN_TEST_LOG_LEVEL_MEMORY, "warning")
 // Specify how much memory each thread allocator starts with.
 PER_THREAD_MEMORY     : int    : #config(ODIN_TEST_THREAD_MEMORY, mem.ROLLBACK_STACK_DEFAULT_BLOCK_SIZE)
 // Select a specific set of tests to run by name.
@@ -63,6 +65,21 @@ get_log_level :: #force_inline proc() -> runtime.Logger_Level {
 	}
 }
 
+get_memory_log_level :: #force_inline proc() -> runtime.Logger_Level {
+	when ODIN_DEBUG {
+		// Always use .Debug in `-debug` mode.
+		return .Debug
+	} else {
+		when LOG_LEVEL_MEMORY == "debug"   { return .Debug   } else
+		when LOG_LEVEL_MEMORY == "info"    { return .Info    } else
+		when LOG_LEVEL_MEMORY == "warning" { return .Warning } else
+		when LOG_LEVEL_MEMORY == "error"   { return .Error   } else
+		when LOG_LEVEL_MEMORY == "fatal"   { return .Fatal   } else {
+			#panic("Unknown `ODIN_TEST_LOG_LEVEL_MEMORY`: \"" + LOG_LEVEL_MEMORY + "\", possible levels are: \"debug\", \"info\", \"warning\", \"error\", or \"fatal\".")
+		}
+	}
+}
+
 JSON :: struct {
 	total:    int,
 	success:  int,
@@ -222,6 +239,10 @@ runner :: proc(internal_tests: []Internal_Test) -> bool {
 	total_success_count := 0
 	total_done_count    := 0
 	total_test_count    := len(internal_tests)
+	when TRACKING_MEMORY {
+		memory_leak_count   := 0
+		bad_free_count      := 0
+	}
 
 	when !FANCY_OUTPUT {
 		// This is strictly for updating the window title when the progress
@@ -498,6 +519,9 @@ runner :: proc(internal_tests: []Internal_Test) -> bool {
 
 				memory_is_in_bad_state := len(tracker.allocation_map) + len(tracker.bad_free_array) > 0
 
+				memory_leak_count += len(tracker.allocation_map)
+				bad_free_count    += len(tracker.bad_free_array)
+
 				when ALWAYS_REPORT_MEMORY {
 					should_report := true
 				} else {
@@ -507,7 +531,9 @@ runner :: proc(internal_tests: []Internal_Test) -> bool {
 				if should_report {
 					write_memory_report(batch_writer, tracker, data.it.pkg, data.it.name)
 
-					pkg_log.log(.Warning if memory_is_in_bad_state else .Info, bytes.buffer_to_string(&batch_buffer))
+					memory_log_level := get_memory_log_level() if memory_is_in_bad_state else .Info
+
+					pkg_log.log(memory_log_level, bytes.buffer_to_string(&batch_buffer))
 					bytes.buffer_reset(&batch_buffer)
 				}
 
@@ -891,5 +917,11 @@ To partly mitigate this, redirect STDERR to a file or use the -define:ODIN_TEST_
 		fmt.assertf(err == nil, "Error writing JSON report: %v", err)
 	}
 
-	return total_success_count == total_test_count
-}
+	fatal_memory_failures := false
+	when TRACKING_MEMORY {
+		if get_memory_log_level() >= .Error {
+			fatal_memory_failures = (memory_leak_count + bad_free_count) > 0
+		}
+	}
+	return total_success_count == total_test_count && !fatal_memory_failures
+}
\ No newline at end of file