diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2442f06..e0d7e725 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 -->
 
 ## __WORK IN PROGRESS__
+* (theknut) Make ioBroker types available in the test directory (#1091)
 * (theknut) Add `licenseInformation` field to `io-package.json` (#1092)
 
 ## 2.6.1 (2024-01-15)
diff --git a/templates/tsconfig.json.ts b/templates/tsconfig.json.ts
index 091830c6..393fcb3b 100644
--- a/templates/tsconfig.json.ts
+++ b/templates/tsconfig.json.ts
@@ -13,7 +13,8 @@ export = (answers => {
 
 	if (useTypeScript) {
 		include = `
-		"src/**/*.ts"`;
+		"src/**/*.ts",
+		"test/**/*.ts"`;
 		exclude = `
 		"build/**",`;
 	} else {
diff --git a/test/baselines/adapter_TS_ES6Class_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json b/test/baselines/adapter_TS_ES6Class_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json
index f32f1245..48ed29c0 100644
--- a/test/baselines/adapter_TS_ES6Class_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json
+++ b/test/baselines/adapter_TS_ES6Class_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json
@@ -35,7 +35,8 @@
 		"inlineSourceMap": false
 	},
 	"include": [
-		"src/**/*.ts"
+		"src/**/*.ts",
+		"test/**/*.ts"
 	],
 	"exclude": [
 		"build/**",
diff --git a/test/baselines/adapter_TS_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json b/test/baselines/adapter_TS_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json
index f32f1245..48ed29c0 100644
--- a/test/baselines/adapter_TS_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json
+++ b/test/baselines/adapter_TS_ESLint_Tabs_DoubleQuotes_MIT/tsconfig.json
@@ -35,7 +35,8 @@
 		"inlineSourceMap": false
 	},
 	"include": [
-		"src/**/*.ts"
+		"src/**/*.ts",
+		"test/**/*.ts"
 	],
 	"exclude": [
 		"build/**",
diff --git a/test/baselines/adapter_TS_React/tsconfig.json b/test/baselines/adapter_TS_React/tsconfig.json
index f32f1245..48ed29c0 100644
--- a/test/baselines/adapter_TS_React/tsconfig.json
+++ b/test/baselines/adapter_TS_React/tsconfig.json
@@ -35,7 +35,8 @@
 		"inlineSourceMap": false
 	},
 	"include": [
-		"src/**/*.ts"
+		"src/**/*.ts",
+		"test/**/*.ts"
 	],
 	"exclude": [
 		"build/**",
diff --git a/test/baselines/minNodeVersion_18/tsconfig.json b/test/baselines/minNodeVersion_18/tsconfig.json
index f32f1245..48ed29c0 100644
--- a/test/baselines/minNodeVersion_18/tsconfig.json
+++ b/test/baselines/minNodeVersion_18/tsconfig.json
@@ -35,7 +35,8 @@
 		"inlineSourceMap": false
 	},
 	"include": [
-		"src/**/*.ts"
+		"src/**/*.ts",
+		"test/**/*.ts"
 	],
 	"exclude": [
 		"build/**",
diff --git a/test/baselines/minNodeVersion_20/tsconfig.json b/test/baselines/minNodeVersion_20/tsconfig.json
index b493a95b..4c80d776 100644
--- a/test/baselines/minNodeVersion_20/tsconfig.json
+++ b/test/baselines/minNodeVersion_20/tsconfig.json
@@ -35,7 +35,8 @@
 		"inlineSourceMap": false
 	},
 	"include": [
-		"src/**/*.ts"
+		"src/**/*.ts",
+		"test/**/*.ts"
 	],
 	"exclude": [
 		"build/**",