Fixed test cases that used a Context without setting positions

platforms/cuda/tests/TestCudaMonteCarloBarostat.cpp

@@ -61,6 +61,9 @@ void testChangingBoxSize() {
     system.addForce(nb);
     LangevinIntegrator integrator(300.0, 1.0, 0.01);
     Context context(system, integrator, platform);
+    vector<Vec3> positions;
+    positions.push_back(Vec3());
+    context.setPositions(positions);
     Vec3 x, y, z;
     context.getState(State::Forces).getPeriodicBoxVectors(x, y, z);
     ASSERT_EQUAL_VEC(Vec3(4, 0, 0), x, 0);

platforms/cuda2/tests/TestCudaMonteCarloBarostat.cpp

@@ -61,6 +61,9 @@ void testChangingBoxSize() {
     system.addForce(nb);
     LangevinIntegrator integrator(300.0, 1.0, 0.01);
     Context context(system, integrator, platform);
+    vector<Vec3> positions;
+    positions.push_back(Vec3());
+    context.setPositions(positions);
     Vec3 x, y, z;
     context.getState(State::Forces).getPeriodicBoxVectors(x, y, z);
     ASSERT_EQUAL_VEC(Vec3(4, 0, 0), x, 0);

platforms/opencl/tests/TestOpenCLMonteCarloBarostat.cpp

@@ -61,6 +61,9 @@ void testChangingBoxSize() {
     system.addForce(nb);
     LangevinIntegrator integrator(300.0, 1.0, 0.01);
     Context context(system, integrator, platform);
+    vector<Vec3> positions;
+    positions.push_back(Vec3());
+    context.setPositions(positions);
     Vec3 x, y, z;
     context.getState(State::Forces).getPeriodicBoxVectors(x, y, z);
     ASSERT_EQUAL_VEC(Vec3(4, 0, 0), x, 0);

platforms/reference/tests/TestReferenceKineticEnergy.cpp

@@ -6,7 +6,7 @@
  * Biological Structures at Stanford, funded under the NIH Roadmap for        *
  * Medical Research, grant U54 GM072970. See https://simtk.org.               *
  *                                                                            *
- * Portions copyright (c) 2008 Stanford University and the Authors.           *
+ * Portions copyright (c) 2008-2012 Stanford University and the Authors.      *
  * Authors: Peter Eastman                                                     *
  * Contributors:                                                              *
  *                                                                            *
@@ -53,6 +53,12 @@ void testCalcKE() {
         system.addParticle(i+1);
     VerletIntegrator integrator(0.01);
     Context context(system, integrator, platform);
+    vector<Vec3> positions(4);
+    positions[0] = Vec3(1, 0, 0);
+    positions[1] = Vec3(2, 0, 0);
+    positions[2] = Vec3(3, 0, 0);
+    positions[3] = Vec3(4, 0, 0);
+    context.setPositions(positions);
     vector<Vec3> velocities(4);
     velocities[0] = Vec3(1, 0, 0);
     velocities[1] = Vec3(0, 1, 0);

platforms/reference/tests/TestReferenceMonteCarloBarostat.cpp

@@ -61,6 +61,9 @@ void testChangingBoxSize() {
     system.addForce(nb);
     LangevinIntegrator integrator(300.0, 1.0, 0.01);
     Context context(system, integrator, platform);
+    vector<Vec3> positions;
+    positions.push_back(Vec3());
+    context.setPositions(positions);
     Vec3 x, y, z;
     context.getState(State::Forces).getPeriodicBoxVectors(x, y, z);
     ASSERT_EQUAL_VEC(Vec3(4, 0, 0), x, 0);