Split WGSL generator tests to individual files.

This makes it easier to find and track tests as the generator grows.

Bug: tint:4
Change-Id: I9660e459f3ffd33f3048a331f23623318af013e0
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/16840
Reviewed-by: David Neto <dneto@google.com>
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0cc9488..d51da20 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -404,6 +404,14 @@
 if(${TINT_BUILD_WGSL_WRITER})
   list(APPEND TINT_TEST_SRCS
     writer/wgsl/generator_impl_test.cc
+    writer/wgsl/generator_impl_alias_type_test.cc
+    writer/wgsl/generator_impl_array_accessor_test.cc
+    writer/wgsl/generator_impl_entry_point_test.cc
+    writer/wgsl/generator_impl_identifier_test.cc
+    writer/wgsl/generator_impl_import_test.cc
+    writer/wgsl/generator_impl_initializer_test.cc
+    writer/wgsl/generator_impl_type_test.cc
+    writer/wgsl/generator_impl_variable_test.cc
   )
 endif()
 add_executable(tint_unittests ${TINT_TEST_SRCS})