Fix rounding bug by using float literals

src/main/java/com/spotify/reaper/resources/view/RepairRunStatus.java

@@ -15,6 +15,7 @@
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.annotations.VisibleForTesting;
 import com.spotify.reaper.core.RepairRun;
 import com.spotify.reaper.core.RepairUnit;
 
@@ -87,11 +88,16 @@ public RepairRunStatus(RepairRun repairRun, RepairUnit repairUnit) {
     this.startTime = repairRun.getStartTime();
     this.endTime = repairRun.getEndTime();
     this.pauseTime = repairRun.getPauseTime();
-    this.intensity = Math.round(repairRun.getIntensity() * 10000) / 10000;
+    this.intensity = roundIntensity(repairRun.getIntensity());
     this.segmentCount = repairUnit.getSegmentCount();
     this.repairParallelism = repairUnit.getRepairParallelism().name().toLowerCase();
   }
 
+  @VisibleForTesting
+  protected static double roundIntensity(double intensity) {
+    return Math.round(intensity * 10000f) / 10000f;
+  }
+
   @JsonProperty("creation_time")
   public String getCreationTimeISO8601() {
     if (creationTime == null) {

src/test/java/com/spotify/reaper/resources/view/RepairRunStatusTest.java

@@ -0,0 +1,23 @@
+package com.spotify.reaper.resources.view;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class RepairRunStatusTest {
+
+  @Test
+  public void testRoundIntensity() throws Exception {
+    assertEquals(0.0f, RepairRunStatus.roundIntensity(0.0f), 0.00000f);
+    assertEquals(0.1f, RepairRunStatus.roundIntensity(0.1f), 0.00001f);
+    assertEquals(0.2f, RepairRunStatus.roundIntensity(0.2f), 0.00001f);
+    assertEquals(0.3f, RepairRunStatus.roundIntensity(0.3f), 0.00001f);
+    assertEquals(0.4f, RepairRunStatus.roundIntensity(0.4f), 0.00001f);
+    assertEquals(0.5f, RepairRunStatus.roundIntensity(0.5f), 0.00001f);
+    assertEquals(0.6f, RepairRunStatus.roundIntensity(0.6f), 0.00001f);
+    assertEquals(0.7f, RepairRunStatus.roundIntensity(0.7f), 0.00001f);
+    assertEquals(0.8f, RepairRunStatus.roundIntensity(0.8f), 0.00001f);
+    assertEquals(0.9f, RepairRunStatus.roundIntensity(0.9f), 0.00001f);
+    assertEquals(1.0f, RepairRunStatus.roundIntensity(1.0f), 0.00001f);
+  }
+}