tests: fix import errors

From the Nim 2.0 "changes affecting backward compatibility" [1]:

    Relative imports will not resolve to searched paths anymore,
    e.g. `import ./tables` now reports an error properly.

[1] https://github.com/nim-lang/Nim/blob/v2.0.0/changelogs/changelog_2_0_0_details.md#changes-affecting-backward-compatibility

tests/all_tests.nim

@@ -1,5 +1,5 @@
 import std/[macros, os]
-import "."/helpers
+import helpers
 
 proc genBracket: NimNode =
   const thisDir = currentSourcePath().parentDir().Path()

tests/test_binary.nim

@@ -1,5 +1,5 @@
 import std/[os, osproc, strformat, strscans, strutils, unittest]
-import "."/[exec, helpers, lint/validators, sync/probspecs]
+import exec, helpers, lint/validators, sync/probspecs
 
 const
   testsDir = currentSourcePath().parentDir()

tests/test_fmt.nim

@@ -1,6 +1,6 @@
 import std/[importutils, json, os, options, random, strutils, unittest]
 import pkg/jsony
-import "."/[exec, helpers, sync/sync_common, types_exercise_config]
+import exec, helpers, sync/sync_common, types_exercise_config
 
 const
   testsDir = currentSourcePath().parentDir()

tests/test_generate.nim

@@ -1,5 +1,5 @@
 import std/[strutils, unittest]
-from "."/generate/generate {.all.} import alterHeadings
+from generate/generate {.all.} import alterHeadings
 
 proc testGenerate =
   suite "generate":

tests/test_lint.nim

@@ -1,6 +1,6 @@
 import std/[strutils, unittest]
-import "."/lint/validators
-import "."/lint/approaches_and_articles {.all.}
+import lint/validators
+import lint/approaches_and_articles {.all.}
 
 proc testIsKebabCase =
   suite "isKebabCase":

tests/test_probspecs.nim

@@ -1,6 +1,6 @@
 # This module contains tests for `src/probspecs.nim`
 import std/[json, os, strformat, tables, unittest]
-import "."/[cli, exec, sync/probspecs]
+import cli, exec, sync/probspecs
 
 proc getProbSpecsExercises(probSpecsDir: ProbSpecsDir): Table[string,
     seq[ProbSpecsTestCase]] =

tests/test_sync.nim

@@ -1,7 +1,7 @@
 import std/[importutils, json, os, options, strutils, unittest]
-import "."/[exec, helpers, sync/sync_common, types_exercise_config, types_track_config]
-from "."/sync/sync_filepaths {.all.} import update
-from "."/sync/sync_metadata {.all.} import UpstreamMetadata, parseMetadataToml,
+import exec, helpers, sync/sync_common, types_exercise_config, types_track_config
+from sync/sync_filepaths {.all.} import update
+from sync/sync_metadata {.all.} import UpstreamMetadata, parseMetadataToml,
     metadataAreUpToDate, update
 
 const

tests/test_tracks.nim

@@ -1,6 +1,6 @@
 # This file implements tests for `src/tracks.nim`
 import std/[os, sequtils, sets, unittest]
-import "."/[cli, exec, sync/tracks]
+import cli, exec, sync/tracks
 
 const
   testsDir = currentSourcePath().parentDir()

tests/test_uuid.nim

@@ -1,6 +1,6 @@
 import std/unittest
 import pkg/uuids
-import "."/lint/validators
+import lint/validators
 
 proc main =
   suite "genUUID: returns a string that isUuidV4 says is valid":