Add test for lazy message semantics

testing/shared/src/test/scala/org/typelevel/log4cats/extras/LogMessageTest.scala

@@ -0,0 +1,28 @@
+package org.typelevel.log4cats.extras
+
+import cats.effect.IO
+import cats.syntax.all.*
+
+import scala.util.control.NoStackTrace
+
+class LogMessageTest extends munit.CatsEffectSuite {
+  private class HaltAndCatchFire extends IllegalStateException("Oops!") with NoStackTrace
+
+  test("LogMessage.apply should preserve lazy message semantics of Logger methods") {
+    def haltAndCatchFire: String = throw new HaltAndCatchFire
+
+    IO.delay(LogMessage(LogLevel.Info, haltAndCatchFire, none, Map.empty))
+      .attemptTap { result =>
+        IO.delay(assert(result.isRight), clue("Should be ok here, the lazy exception shouldn't be triggered yet"))
+      }
+      .flatTap { lm =>
+        IO.delay(lm.lazyMessage()).intercept[HaltAndCatchFire]
+      }
+      .flatTap { lm =>
+        IO.delay(lm.toString).intercept[HaltAndCatchFire]
+      }
+      .flatTap { lm =>
+        IO.delay(lm == LogMessage(LogLevel.Info, "Ok", none, Map.empty)).intercept[HaltAndCatchFire]
+      }
+  }
+}