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src/test/java/com/tf/romanCharConverter/RomanCharConverterTest.java

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+package com.tf.romanCharConverter;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class RomanCharConverterTest {
+    private RomanCharConverter converter;
+
+    @BeforeEach
+    public void setUp() {
+        converter = new RomanCharConverter();
+    }
+
+    @Test
+    public void givenSingleRomanChar_whenConvert_thenArabic(){
+        assertEquals(10, converter.convert("X"));
+        assertEquals(50, converter.convert("L"));
+        assertEquals(100, converter.convert("C"));
+        assertEquals(500, converter.convert("D"));
+        assertEquals(1000, converter.convert("M"));
+        assertEquals(5000, converter.convert("A"));
+    }
+
+    @Test
+    public void givenMultipleRomanChar_whenConvert_thenArabic(){
+        assertEquals(2, converter.convert("II"));
+        assertEquals(20, converter.convert("XX"));
+        assertEquals(200, converter.convert("CC"));
+        assertEquals(2000, converter.convert("MM"));
+        assertEquals(10000, converter.convert("AA"));
+
+        assertEquals(3, converter.convert("III"));
+        assertEquals(30, converter.convert("XXX"));
+        assertEquals(300, converter.convert("CCC"));
+        assertEquals(3000, converter.convert("MMM"));
+        assertEquals(1500, converter.convert("MD"));
+    }
+
+    @Test
+    public void givenMultipleRomanSubstractChar_whenConvert_thenArabic(){
+        assertEquals(4, converter.convert("IV"));
+        assertEquals(9, converter.convert("IX"));
+        assertEquals(40, converter.convert("XL"));
+        assertEquals(90, converter.convert("XC"));
+        assertEquals(400, converter.convert("CD"));
+        assertEquals(900, converter.convert("CM"));
+        assertEquals(14, converter.convert("XIV"));
+    }
+}