diff --git a/src/commonTest/kotlin/MoneyRatioTest.kt b/src/commonTest/kotlin/MoneyRatioTest.kt
new file mode 100644
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--- /dev/null
+++ b/src/commonTest/kotlin/MoneyRatioTest.kt
@@ -0,0 +1,46 @@
+/*
+ * 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 MoneyRatioTest {
+
+  @Test
+  fun `Should create Money Ratio instance from String`() {
+    Money.Ratio("1.25").toString() shouldBe "1.25"
+  }
+
+  @Test
+  fun `Should create Money Ratio instance with long fractional part`() {
+    Money.Ratio("0.0000001").toString() shouldBe "0.0000001"
+  }
+
+  @Test
+  fun `Should compare Money Ratio instances`() {
+    Money.Ratio.ONE shouldBe Money.Ratio("1")
+    Money.Ratio("0") shouldBe Money.Ratio("0.0")
+    Money.Ratio("0.1") shouldBe Money.Ratio("0.100000")
+  }
+
+  @Test
+  fun `Should multiple Money Ratio and Money`() {
+    Money.Ratio("0.000001") * Money("3.0") shouldBe Money("0.000003")
+  }
+
+}