diff --git a/src/commonTest/kotlin/MoneyTest.kt b/src/commonTest/kotlin/MoneyTest.kt
new file mode 100644
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+++ b/src/commonTest/kotlin/MoneyTest.kt
@@ -0,0 +1,87 @@
+/*
+ * 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
+
+import com.xemantic.ai.money.test.shouldBe
+import kotlin.test.Test
+
+class MoneyTest {
+
+  @Test
+  fun `Should create Money instance from String`() {
+    Money("42.50").toString() shouldBe "42.5"
+  }
+
+  @Test
+  fun `Should create Money instance with long fractional part`() {
+    Money("42.123456789").toString() shouldBe "42.123456789"
+  }
+
+  @Test
+  fun `Should compare Money instances`() {
+    Money.ZERO shouldBe Money("0")
+    Money.ONE shouldBe Money("1")
+    Money.ONE shouldBe Money("1.0")
+    Money("0.1") shouldBe Money("0.100")
+  }
+
+  @Test
+  fun `Should add Moneys`() {
+    Money("10.25") + Money("5.75") shouldBe Money("16.00")
+  }
+
+  @Test
+  fun `Should subtract Moneys`() {
+    Money("20.00") - Money("7.50") shouldBe Money("12.50")
+  }
+
+  @Test
+  fun `Should multiply Moneys`() {
+    Money("5.01") * Money("3.00") shouldBe Money("15.03")
+  }
+
+  @Test
+  fun `Should multiply Money by Int Ratio scalar`() {
+    Money("5.01") * Money.Ratio("3") shouldBe Money("15.03")
+  }
+
+  @Test
+  fun `Should multiply Money by proportion Ratio`() {
+    Money("2.0") * Money.Ratio("1.25") shouldBe Money("2.5")
+  }
+
+  @Test
+  fun `Should create Money instance for token price`() {
+    Money("3.0") * Money.Ratio("0.000001") shouldBe Money("0.000003")
+  }
+
+  @Test
+  fun `Should compare different Money amounts`() {
+    // given
+    val money1 = Money("10.00")
+    val money2 = Money("10.00")
+    val money3 = Money("20.00")
+
+    // then
+    (money1 == money2) shouldBe true
+    (money1 < money3) shouldBe true
+    (money3 > money1) shouldBe true
+    (money1 == money3) shouldBe false
+    (money3 < money1) shouldBe false
+  }
+
+}