1 files changed, 70 insertions, 0 deletions

diff --git a/ui-desktop/src/test/java/market/guess/ui/desktop/AnimTest.java b/ui-desktop/src/test/java/market/guess/ui/desktop/AnimTest.java
new file mode 100644
index 0000000..1a39ba1
--- /dev/null
+++ b/ui-desktop/src/test/java/market/guess/ui/desktop/AnimTest.java
@@ -0,0 +1,70 @@
+package market.guess.ui.desktop;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import market.guess.ui.desktop.components.graphic.GraphicHelper;
+import market.guess.ui.desktop.components.graphic.MarketChartGraphic;
+import market.guess.ui.desktop.components.graphic.Motion;
+import market.guess.ui.desktop.components.graphic.SparklineGraphic;
+import org.junit.jupiter.api.Test;
+
+/**
+ * The handoff requires "animations off" to show the frozen final frame, fully legible and never
+ * blank. Since every graphic renders as a function of progress, that contract is exactly: at
+ * progress 1, every driver lands on its designed end value.
+ */
+class AnimTest {
+  private static final double[] BAR1 = {0, .35, .30, 1, .60, .6, 1, .35};
+
+  @Test
+  void keyframesHoldTheirEndValue() {
+    assertEquals(.35, GraphicHelper.at(0, BAR1), 1e-9);
+    assertEquals(1.0, GraphicHelper.at(.30, BAR1), 1e-9);
+    assertEquals(.35, GraphicHelper.at(1, BAR1), 1e-9);
+    assertEquals(.675, GraphicHelper.at(.15, BAR1), 1e-9); // interpolates linearly between stops
+    assertEquals(.35, Motion.at(0, BAR1), 1e-9);
+  }
+
+  @Test
+  void ridersEndOnTheLastPointOfTheirPath() {
+    assertEquals(
+        MarketChartGraphic.YES_CURVE[6],
+        MarketChartGraphic.rideCurve(MarketChartGraphic.YES_CURVE, 1)[0],
+        1e-6);
+    assertEquals(
+        MarketChartGraphic.YES_CURVE[7],
+        MarketChartGraphic.rideCurve(MarketChartGraphic.YES_CURVE, 1)[1],
+        1e-6);
+
+    int last = SparklineGraphic.SPARK.length;
+    assertEquals(
+        SparklineGraphic.SPARK[last - 2],
+        SparklineGraphic.ridePolyline(SparklineGraphic.SPARK, 1)[0],
+        1e-6);
+    assertEquals(
+        SparklineGraphic.SPARK[last - 1],
+        SparklineGraphic.ridePolyline(SparklineGraphic.SPARK, 1)[1],
+        1e-6);
+  }
+
+  @Test
+  void ridersStartOnTheFirstPointOfTheirPath() {
+    assertEquals(
+        MarketChartGraphic.YES_CURVE[0],
+        MarketChartGraphic.rideCurve(MarketChartGraphic.YES_CURVE, 0)[0],
+        1e-6);
+    assertEquals(
+        MarketChartGraphic.YES_CURVE[1],
+        MarketChartGraphic.rideCurve(MarketChartGraphic.YES_CURVE, 0)[1],
+        1e-6);
+
+    assertEquals(
+        SparklineGraphic.SPARK[0],
+        SparklineGraphic.ridePolyline(SparklineGraphic.SPARK, 0)[0],
+        1e-6);
+    assertEquals(
+        SparklineGraphic.SPARK[1],
+        SparklineGraphic.ridePolyline(SparklineGraphic.SPARK, 0)[1],
+        1e-6);
+  }
+}