Add unit tests

Adds unit tests for a variety of classes in the streamline framework. These unit tests were added as-needed to debug problems, and aren't meant to give comprehensive or systematic coverage.
NASA-AMMOS · Dec 19, 2023 · ec262c7 · ec262c7
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diff --git a/contrib/src/test/java/gov/nasa/jpl/aerie/contrib/streamline/core/CellRefV2Test.java b/contrib/src/test/java/gov/nasa/jpl/aerie/contrib/streamline/core/CellRefV2Test.java
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+package gov.nasa.jpl.aerie.contrib.streamline.core;
+
+import gov.nasa.jpl.aerie.contrib.streamline.modeling.discrete.Discrete;
+import gov.nasa.jpl.aerie.merlin.framework.Registrar;
+import gov.nasa.jpl.aerie.merlin.framework.junit.MerlinExtension;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.TestInstance.Lifecycle;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import static gov.nasa.jpl.aerie.contrib.streamline.core.CellRefV2.autoEffects;
+import static gov.nasa.jpl.aerie.contrib.streamline.core.CellRefV2.commutingEffects;
+import static gov.nasa.jpl.aerie.contrib.streamline.core.CellRefV2.noncommutingEffects;
+import static gov.nasa.jpl.aerie.contrib.streamline.core.MutableResource.resource;
+import static gov.nasa.jpl.aerie.contrib.streamline.core.Resources.currentValue;
+import static gov.nasa.jpl.aerie.contrib.streamline.modeling.discrete.Discrete.discrete;
+import static gov.nasa.jpl.aerie.contrib.streamline.modeling.discrete.monads.DiscreteDynamicsMonad.effect;
+import static gov.nasa.jpl.aerie.merlin.framework.ModelActions.delay;
+import static gov.nasa.jpl.aerie.merlin.framework.ModelActions.spawn;
+import static gov.nasa.jpl.aerie.merlin.protocol.types.Duration.ZERO;
+import static org.junit.jupiter.api.Assertions.*;
+
+class MutableResourceTest {
+  @Nested
+  @ExtendWith(MerlinExtension.class)
+  @TestInstance(Lifecycle.PER_CLASS)
+  class NonCommutingEffects {
+    public NonCommutingEffects(final Registrar registrar) {
+      Resources.init();
+    }
+
+    private final MutableResource<Discrete<Integer>> cell = MutableResource.resource(discrete(42), noncommutingEffects());
+
+    @Test
+    void gets_initial_value_if_no_effects_are_emitted() {
+      assertEquals(42, currentValue(cell));
+    }
+
+    @Test
+    void applies_singleton_effect() {
+      int initialValue = currentValue(cell);
+      cell.emit(effect(n -> 3 * n));
+      assertEquals(3 * initialValue, currentValue(cell));
+    }
+
+    @Test
+    void applies_sequential_effects_in_order() {
+      int initialValue = currentValue(cell);
+      cell.emit(effect(n -> 3 * n));
+      cell.emit(effect(n -> n + 1));
+      assertEquals(3 * initialValue + 1, currentValue(cell));
+    }
+
+    @Test
+    void throws_exception_when_concurrent_effects_are_applied() {
+      spawn(() -> cell.emit(effect(n -> 3 * n)));
+      spawn(() -> cell.emit(effect(n -> 3 * n)));
+      delay(ZERO);
+      assertInstanceOf(ErrorCatching.Failure.class, cell.getDynamics());
+    }
+  }
+
+  @Nested
+  @ExtendWith(MerlinExtension.class)
+  @TestInstance(Lifecycle.PER_CLASS)
+  class CommutingEffects {
+    public CommutingEffects(final Registrar registrar) {
+      Resources.init();
+    }
+
+    private final MutableResource<Discrete<Integer>> cell = MutableResource.resource(discrete(42), commutingEffects());
+
+    @Test
+    void gets_initial_value_if_no_effects_are_emitted() {
+      assertEquals(42, currentValue(cell));
+    }
+
+    @Test
+    void applies_singleton_effect() {
+      int initialValue = currentValue(cell);
+      cell.emit(effect(n -> 3 * n));
+      assertEquals(3 * initialValue, currentValue(cell));
+    }
+
+    @Test
+    void applies_sequential_effects_in_order() {
+      int initialValue = currentValue(cell);
+      cell.emit(effect(n -> 3 * n));
+      cell.emit(effect(n -> n + 1));
+      assertEquals(3 * initialValue + 1, currentValue(cell));
+    }
+
+    @Test
+    void applies_concurrent_effects_in_any_order() {
+      int initialValue = currentValue(cell);
+      // These effects do not in fact commute,
+      // but the point of the commutingEffects is that it *doesn't* check.
+      spawn(() -> cell.emit(effect(n -> 3 * n)));
+      spawn(() -> cell.emit(effect(n -> n + 1)));
+      delay(ZERO);
+      int result = currentValue(cell);
+      assertTrue(result == 3*initialValue + 1 || result == 3 * (initialValue + 1));
+    }
+  }
+
+  @Nested
+  @ExtendWith(MerlinExtension.class)
+  @TestInstance(Lifecycle.PER_CLASS)
+  class AutoEffects {
+    public AutoEffects(final Registrar registrar) {
+      Resources.init();
+    }
+
+    private final MutableResource<Discrete<Integer>> cell = MutableResource.resource(discrete(42), autoEffects());
+
+    @Test
+    void gets_initial_value_if_no_effects_are_emitted() {
+      assertEquals(42, currentValue(cell));
+    }
+
+    @Test
+    void applies_singleton_effect() {
+      int initialValue = currentValue(cell);
+      cell.emit(effect(n -> 3 * n));
+      assertEquals(3 * initialValue, currentValue(cell));
+    }
+
+    @Test
+    void applies_sequential_effects_in_order() {
+      int initialValue = currentValue(cell);
+      cell.emit(effect(n -> 3 * n));
+      cell.emit(effect(n -> n + 1));
+      assertEquals(3 * initialValue + 1, currentValue(cell));
+    }
+
+    @Test
+    void applies_commuting_concurrent_effects() {
+      int initialValue = currentValue(cell);
+      // These effects do not in fact commute,
+      // but the point of the commutingEffects is that it *doesn't* check.
+      spawn(() -> cell.emit(effect(n -> 3 * n)));
+      spawn(() -> cell.emit(effect(n -> 4 * n)));
+      delay(ZERO);
+      int result = currentValue(cell);
+      assertEquals(12 * initialValue, result);
+    }
+
+    @Test
+    void throws_exception_when_non_commuting_concurrent_effects_are_applied() {
+      spawn(() -> cell.emit(effect(n -> 3 * n)));
+      spawn(() -> cell.emit(effect(n -> n + 1)));
+      delay(ZERO);
+      assertInstanceOf(ErrorCatching.Failure.class, cell.getDynamics());
+    }
+  }
+}
diff --git a/contrib/src/test/java/gov/nasa/jpl/aerie/contrib/streamline/core/ExpiryTest.java b/contrib/src/test/java/gov/nasa/jpl/aerie/contrib/streamline/core/ExpiryTest.java
@@ -0,0 +1,153 @@
+package gov.nasa.jpl.aerie.contrib.streamline.core;
+
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import java.util.Optional;
+
+import static gov.nasa.jpl.aerie.contrib.streamline.core.Expiry.NEVER;
+import static gov.nasa.jpl.aerie.contrib.streamline.core.Expiry.at;
+import static gov.nasa.jpl.aerie.contrib.streamline.core.Expiry.expiry;
+import static gov.nasa.jpl.aerie.merlin.protocol.types.Duration.HOUR;
+import static gov.nasa.jpl.aerie.merlin.protocol.types.Duration.MINUTE;
+import static org.junit.jupiter.api.Assertions.*;
+
+class ExpiryTest {
+  @Nested
+  class Value {
+    @Test
+    void never_expiring_has_empty_value() {
+      assertEquals(Optional.empty(), NEVER.value());
+    }
+
+    @Test
+    void expiring_at_t_has_value_of_t() {
+      assertEquals(Optional.of(MINUTE), Expiry.at(MINUTE).value());
+    }
+  }
+
+  @Nested
+  class Equals {
+    @Test
+    void never_equals_never() {
+      assertEquals(NEVER, NEVER);
+      assertEquals(NEVER, expiry(Optional.empty()));
+      assertEquals(expiry(Optional.empty()), NEVER);
+      assertEquals(expiry(Optional.empty()), expiry(Optional.empty()));
+    }
+
+    @Test
+    void at_t_equals_at_t() {
+      assertEquals(at(MINUTE), at(MINUTE));
+    }
+
+    @Test
+    void at_t_does_not_equal_never() {
+      assertNotEquals(at(MINUTE), NEVER);
+      assertNotEquals(NEVER, at(MINUTE));
+    }
+
+    @Test
+    void at_t_does_not_equal_at_s() {
+      assertNotEquals(at(MINUTE), at(HOUR));
+      assertNotEquals(at(HOUR), at(MINUTE));
+    }
+  }
+
+  @Nested
+  class IsNever {
+    @Test
+    void never_is_never() {
+      assertTrue(NEVER.isNever());
+    }
+
+    @Test
+    void at_t_is_not_never() {
+      assertFalse(at(MINUTE).isNever());
+    }
+  }
+
+  @Nested
+  class Or {
+    @Test
+    void never_or_never_returns_never() {
+      assertEquals(NEVER, NEVER.or(NEVER));
+    }
+
+    @Test
+    void never_or_at_t_returns_at_t() {
+      assertEquals(at(MINUTE), NEVER.or(at(MINUTE)));
+    }
+
+    @Test
+    void at_t_or_never_returns_at_t() {
+      assertEquals(at(MINUTE), at(MINUTE).or(NEVER));
+    }
+
+    @Test
+    void at_t_or_at_greater_than_t_returns_at_t() {
+      assertEquals(at(MINUTE), at(MINUTE).or(at(HOUR)));
+    }
+
+    @Test
+    void at_greater_than_t_or_at_t_returns_at_t() {
+      assertEquals(at(MINUTE), at(HOUR).or(at(MINUTE)));
+    }
+  }
+
+  @Nested
+  class Minus {
+    @Test
+    void never_minus_t_returns_never() {
+      assertEquals(NEVER, NEVER.minus(MINUTE));
+    }
+
+    @Test
+    void at_t_minus_s_returns_at_difference() {
+      assertEquals(at(HOUR.minus(MINUTE)), at(HOUR).minus(MINUTE));
+    }
+  }
+
+  @Nested
+  class Comparisons {
+    @Test
+    void never_equals_never() {
+      assertFalse(NEVER.shorterThan(NEVER));
+      assertTrue(NEVER.noShorterThan(NEVER));
+      assertFalse(NEVER.longerThan(NEVER));
+      assertTrue(NEVER.noLongerThan(NEVER));
+    }
+
+    @Test
+    void at_t_equals_at_t() {
+      assertFalse(at(MINUTE).shorterThan(at(MINUTE)));
+      assertTrue(at(MINUTE).noShorterThan(at(MINUTE)));
+      assertFalse(at(MINUTE).longerThan(at(MINUTE)));
+      assertTrue(at(MINUTE).noLongerThan(at(MINUTE)));
+    }
+
+    @Test
+    void at_t_shorter_than_never() {
+      assertTrue(at(MINUTE).shorterThan(NEVER));
+      assertFalse(at(MINUTE).noShorterThan(NEVER));
+      assertFalse(at(MINUTE).longerThan(NEVER));
+      assertTrue(at(MINUTE).noLongerThan(NEVER));
+    }
+
+    @Test
+    void never_longer_than_at_t() {
+      assertFalse(NEVER.shorterThan(at(MINUTE)));
+      assertTrue(NEVER.noShorterThan(at(MINUTE)));
+      assertTrue(NEVER.longerThan(at(MINUTE)));
+      assertFalse(NEVER.noLongerThan(at(MINUTE)));
+    }
+
+    @Test
+    void at_t_shorter_than_at_greater_than_t() {
+      assertTrue(at(MINUTE).shorterThan(at(HOUR)));
+      assertFalse(at(MINUTE).noShorterThan(at(HOUR)));
+      assertFalse(at(MINUTE).longerThan(at(HOUR)));
+      assertTrue(at(MINUTE).noLongerThan(at(HOUR)));
+    }
+  }
+}
diff --git a/contrib/src/test/java/gov/nasa/jpl/aerie/contrib/streamline/debugging/DependenciesTest.java b/contrib/src/test/java/gov/nasa/jpl/aerie/contrib/streamline/debugging/DependenciesTest.java
@@ -0,0 +1,67 @@
+package gov.nasa.jpl.aerie.contrib.streamline.debugging;
+
+import gov.nasa.jpl.aerie.contrib.streamline.core.MutableResource;
+import gov.nasa.jpl.aerie.contrib.streamline.core.Resource;
+import gov.nasa.jpl.aerie.contrib.streamline.modeling.discrete.Discrete;
+import gov.nasa.jpl.aerie.contrib.streamline.modeling.discrete.DiscreteResources;
+import gov.nasa.jpl.aerie.contrib.streamline.modeling.polynomial.Polynomial;
+import gov.nasa.jpl.aerie.merlin.framework.junit.MerlinExtension;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import static gov.nasa.jpl.aerie.contrib.streamline.core.MutableResource.resource;
+import static gov.nasa.jpl.aerie.contrib.streamline.core.monads.ResourceMonad.*;
+import static gov.nasa.jpl.aerie.contrib.streamline.modeling.polynomial.Polynomial.polynomial;
+import static gov.nasa.jpl.aerie.contrib.streamline.modeling.polynomial.PolynomialResources.constant;
+import static org.junit.jupiter.api.Assertions.*;
+
+@Nested
+@ExtendWith(MerlinExtension.class)
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class DependenciesTest {
+  Resource<Discrete<Boolean>> constantTrue = DiscreteResources.constant(true);
+  Resource<Polynomial> constant1234 = constant(1234);
+  Resource<Polynomial> constant5678 = constant(5678);
+  Resource<Polynomial> polynomialCell = resource(polynomial(1));
+  Resource<Polynomial> derived = map(constantTrue, constant1234, constant5678,
+                                     (b, x, y) -> b.extract() ? x : y);
+
+  @Test
+  void constants_are_named_by_their_value() {
+    assertTrue(Naming.getName(constantTrue).get().contains("true"));
+    assertTrue(Naming.getName(constant1234).get().contains("1234"));
+    assertTrue(Naming.getName(constant5678).get().contains("5678"));
+  }
+
+  @Test
+  void cell_resources_are_not_inherently_named() {
+    assertTrue(Naming.getName(polynomialCell).isEmpty());
+  }
+
+  @Test
+  void derived_resources_are_not_inherently_named() {
+    assertTrue(Naming.getName(derived).isEmpty());
+  }
+
+  @Test
+  void constants_have_no_dependencies() {
+    assertTrue(Dependencies.getDependencies(constantTrue).isEmpty());
+    assertTrue(Dependencies.getDependencies(constant1234).isEmpty());
+    assertTrue(Dependencies.getDependencies(constant5678).isEmpty());
+  }
+
+  @Test
+  void cell_resources_have_no_dependencies() {
+    assertTrue(Dependencies.getDependencies(polynomialCell).isEmpty());
+  }
+
+  @Test
+  void derived_resources_have_their_sources_as_dependencies() {
+    var graphDescription = Dependencies.describeDependencyGraph(derived, true);
+    assertTrue(graphDescription.contains("true"));
+    assertTrue(graphDescription.contains("1234"));
+    assertTrue(graphDescription.contains("5678"));
+  }
+}