format

src/test/java/LargeFormatterTest.java

@@ -0,0 +1,42 @@
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class LargeFormatterTest {
+
+    LargeFormatter lf;
+
+    @BeforeEach
+    void setUp() {
+        lf = new LargeFormatter();
+    }
+
+    @Test
+    void tinyNumberTest(){
+        double n = 0.1;
+        String s = "0.10";
+        assertEquals(s, lf.formatBigNumber(n));
+    }
+
+    @Test
+    void smallNumberTest(){
+        double n = 10;
+        String s = "10";
+        assertEquals(s, lf.formatBigNumber(n));
+    }
+
+    @Test
+    void kTest(){
+        double n = 1000;
+        String s = "1k";
+        assertEquals(s, lf.formatBigNumber(n));
+    }
+
+    @Test
+    void mTest(){
+        double n = 10230000;
+        String s = "10.23M";
+        assertEquals(s, lf.formatBigNumber(n));
+    }
+}