Fix tests on Windows filesystems

packages/emitter/test/integration.test.ts

···
         // Create a virtual main.tsp that imports all other files
         const mainContent =
           'import "@typelex/emitter";\n' +
-          tspFiles.map((f) => `import "./${f}";`).join("\n");
+          tspFiles.map((f) => `import "./${normalizePathToPosix(f)}";`).join("\n");
         const filesWithMain = { ...inputFiles, "main.tsp": mainContent };
         emitResult = await doEmit(filesWithMain, "main.tsp");
       } else {
···
               );
             }
 
+            const normalizedExpectedPath = normalizePathToPosix(expectedPath);
+
             assert.ok(
               Object.prototype.hasOwnProperty.call(
                 emitResult.files,
-                expectedPath,
+                normalizedExpectedPath,
               ),
               `Expected file ${expectedPath} was not produced`,
             );
 
-            const actual = JSON.parse(emitResult.files[expectedPath]);
+            const actual = JSON.parse(emitResult.files[normalizedExpectedPath]);
             const expected = JSON.parse(expectedFiles[expectedPath]);
             assert.deepStrictEqual(actual, expected);
           });
···
   await walk(dir, "");
   return result;
 }
+
+function normalizePathToPosix(thePath: string): string {
+  return thePath.replaceAll(path.sep, path.posix.sep);
+}

packages/emitter/test/spec.test.ts

···
         // Create a virtual main.tsp that imports all other files
         const mainContent =
           'import "@typelex/emitter";\n' +
-          tspFiles.map((f) => `import "./${f}";`).join("\n");
+          tspFiles.map((f) => `import "./${normalizePathToPosix(f)}";`).join("\n");
         const filesWithMain = { ...inputFiles, "main.tsp": mainContent };
         emitResult = await doEmit(filesWithMain, "main.tsp");
       } else {
···
               );
             }
 
+            const normalizedExpectedPath = normalizePathToPosix(expectedPath);
+
             assert.ok(
               Object.prototype.hasOwnProperty.call(
                 emitResult.files,
-                expectedPath,
+                normalizedExpectedPath,
               ),
               `Expected file ${expectedPath} was not produced`,
             );
 
-            const actual = JSON.parse(emitResult.files[expectedPath]);
+            const actual = JSON.parse(emitResult.files[normalizedExpectedPath]);
             const expected = JSON.parse(expectedFiles[expectedPath]);
             assert.deepStrictEqual(actual, expected);
           });
···
   await walk(dir, "");
   return result;
 }
+
+function normalizePathToPosix(thePath: string): string {
+  return thePath.replaceAll(path.sep, path.posix.sep);
+}