diff --git a/src/commonTest/kotlin/test/TestSupport.kt b/src/commonTest/kotlin/test/TestSupport.kt
new file mode 100644
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--- /dev/null
+++ b/src/commonTest/kotlin/test/TestSupport.kt
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2024 Kazimierz Pogoda / Xemantic
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.xemantic.ai.money.test
+
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.json.Json
+import kotlin.test.asserter
+
+/**
+ * A pretty printing [Json] for tests.
+ */
+val testJson = Json {
+  prettyPrint = true
+  @OptIn(ExperimentalSerializationApi::class)
+  prettyPrintIndent = "  "
+}
+
+/**
+ * Provides an infix function for equality assertions in tests.
+ *
+ * This function is inspired by the Kotest library's assertions but is implemented
+ * to support power-assert conventions. It allows for a more readable and expressive
+ * way of writing assertions in Kotlin tests.
+ *
+ * Note: Together with the `shouldBe` variant receiving a message this function fulfills
+ * the `power-assert` convention.
+ *
+ * @param expected The expected value to compare against.
+ * @throws AssertionError if the actual value is not equal to the expected value.
+ */
+infix fun <V> V.shouldBe(
+  expected: V
+) {
+  shouldBe(
+    expected = expected,
+    message = null
+  )
+}
+
+/**
+ * Asserts that the actual value is equal to the expected value.
+ *
+ * This function provides a more flexible way to perform equality assertions
+ * by allowing an optional custom error message.
+ *
+ * @param expected The expected value to compare against.
+ * @param message An optional custom message to be used in case of assertion failure.
+ * @throws AssertionError if the actual value is not equal to the expected value.
+ */
+fun <V> V.shouldBe(
+  expected: V,
+  message: String? = null
+) {
+  asserter.assertEquals(
+    message = message,
+    actual = this,
+    expected = expected
+  )
+}