Add test data helpers

timings/src/main/java/com/ankurm/vectorapi/Data.java

@@ -0,0 +1,22 @@
+package com.ankurm.vectorapi;
+
+import java.util.Random;
+
+public final class Data {
+    static float[] randomFloats(int n, long seed) {
+        Random r = new Random(seed);
+        float[] a = new float[n];
+        for (int i = 0; i < n; i++) a[i] = r.nextFloat();
+        return a;
+    }
+
+    static void assertSame(String what, float[] x, float[] y) {
+        for (int i = 0; i < x.length; i++) {
+            if (Math.abs(x[i] - y[i]) > 1e-4f) {
+                throw new AssertionError(what + ": mismatch at " + i + ": " + x[i] + " != " + y[i]);
+            }
+        }
+    }
+
+    private Data() {}
+}