Add in compat for 2.13 tests

Author: ckipp01

tests/unit/src/test/scala/tests/imports/DependencySuite.scala

@@ -84,9 +84,9 @@ class DependencySuite extends BaseMarkdownSuite {
        |  not found: https://repo1.maven.org/maven2/org/scalameta/foobar/1.2.1/foobar-1.2.1.pom
        |import $dep.`org.scalameta::mmunit:2.3.4`, $dep.`org.scalameta:foobar:1.2.1`
        |                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-       |error: dep-error.md:4:13: Error downloading org.scalameta:not-exists_2.13.2:2.3.4
+       |error: dep-error.md:4:13: Error downloading org.scalameta:not-exists_2.13.4:2.3.4
        |<redacted user.home>
-       |  not found: https://repo1.maven.org/maven2/org/scalameta/not-exists_2.13.2/2.3.4/not-exists_2.13.2-2.3.4.pom
+       |  not found: https://repo1.maven.org/maven2/org/scalameta/not-exists_2.13.4/2.3.4/not-exists_2.13.2-2.3.4.pom
        |import $dep.`org.scalameta:::not-exists:2.3.4`
        |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |error: dep-error.md:3:13: Error downloading org.scalameta:mmunit_2.13:2.3.4

tests/unit/src/test/scala/tests/markdown/AsyncSuite.scala

@@ -31,7 +31,7 @@ class AsyncSuite extends BaseMarkdownSuite {
        |java.util.concurrent.TimeoutException: Futures timed out after [10 milliseconds]
        |	at scala.concurrent.impl.Promise$DefaultPromise.ready(Promise.scala:259)
        |	at scala.concurrent.impl.Promise$DefaultPromise.result(Promise.scala:263)
-       |	at scala.concurrent.Await$.$anonfun$result$1(package.scala:220)
+       |	at scala.concurrent.Await$.$anonfun$result$1(package.scala:223)
        |	at scala.concurrent.BlockContext$DefaultBlockContext$.blockOn(BlockContext.scala:57)
        |	at scala.concurrent.Await$.result(package.scala:146)
        |	at repl.MdocSession$App.<init>(timeout.md:11)

tests/unit/src/test/scala/tests/markdown/BaseMarkdownSuite.scala

@@ -115,7 +115,7 @@ abstract class BaseMarkdownSuite extends tests.BaseSuite {
       settings,
       obtained => {
         assertNoDiff(
-          Compat(obtained, Map.empty, postProcessObtained),
+          Compat(obtained, compat, postProcessObtained),
           Compat(expected, compat, postProcessExpected)
         )
       }

tests/unit/src/test/scala/tests/markdown/CrashSuite.scala

@@ -17,7 +17,19 @@ class CrashSuite extends BaseMarkdownSuite {
        |// 	at repl.MdocSession$App$$anonfun$3.apply(basic.md:14)
        |// 	at repl.MdocSession$App$$anonfun$3.apply(basic.md:14)
        |```
+    """.stripMargin,
+    compat = Map(
+      "2.13" ->
+        """|```scala
+           |val x = 1
+           |???
+           |// scala.NotImplementedError: an implementation is missing
+           |// 	at scala.Predef$.$qmark$qmark$qmark(Predef.scala:347)
+           |// 	at repl.MdocSession$App$$anonfun$3.apply(basic.md:14)
+           |// 	at repl.MdocSession$App$$anonfun$3.apply(basic.md:14)
+           |```
     """.stripMargin
+    )
   )
 
   checkError(
@@ -81,7 +93,18 @@ class CrashSuite extends BaseMarkdownSuite {
        |// 	at repl.MdocSession$App$$anonfun$1.apply(relative.md:9)
        |// 	at repl.MdocSession$App$$anonfun$1.apply(relative.md:9)
        |```
+    """.stripMargin,
+    compat = Map(
+      "2.13" ->
+        """|```scala
+           |???
+           |// scala.NotImplementedError: an implementation is missing
+           |// 	at scala.Predef$.$qmark$qmark$qmark(Predef.scala:347)
+           |// 	at repl.MdocSession$App$$anonfun$1.apply(relative.md:9)
+           |// 	at repl.MdocSession$App$$anonfun$1.apply(relative.md:9)
+           |```
     """.stripMargin
+    )
   )
 
   check(

tests/unit/src/test/scala/tests/markdown/ErrorSuite.scala

@@ -33,7 +33,16 @@ class ErrorSuite extends BaseMarkdownSuite {
        |^^^^^^^^^
        |scala.NotImplementedError: an implementation is missing
        |	at scala.Predef$.$qmark$qmark$qmark(Predef.scala:288)
-       |""".stripMargin
+       |""".stripMargin,
+    compat = Map(
+      "2.13" ->
+        """|error: crash.md:10:1: an implementation is missing
+           |x + y + z
+           |^^^^^^^^^
+           |scala.NotImplementedError: an implementation is missing
+           |	at scala.Predef$.$qmark$qmark$qmark(Predef.scala:347)
+           |""".stripMargin
+    )
   )
 
   checkError(