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-rw-r--r--src/test/java/au/id/zancanaro/javacheck/CollectionsTest.java23
-rw-r--r--src/test/java/au/id/zancanaro/javacheck/OptionalRulesTest.java (renamed from src/test/java/au/id/zancanaro/javacheck/OptionalFunctorRulesTest.java)29
-rw-r--r--src/test/java/au/id/zancanaro/javacheck/SetFunctorRulesTest.java106
-rw-r--r--src/test/java/au/id/zancanaro/javacheck/SimpleListOperationsTest.java10
4 files changed, 144 insertions, 24 deletions
diff --git a/src/test/java/au/id/zancanaro/javacheck/CollectionsTest.java b/src/test/java/au/id/zancanaro/javacheck/CollectionsTest.java
new file mode 100644
index 0000000..644e8a1
--- /dev/null
+++ b/src/test/java/au/id/zancanaro/javacheck/CollectionsTest.java
@@ -0,0 +1,23 @@
+package au.id.zancanaro.javacheck;
+
+import au.id.zancanaro.javacheck.annotations.Property;
+import au.id.zancanaro.javacheck.junit.Properties;
+import org.junit.runner.RunWith;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static java.util.Collections.reverse;
+import static org.junit.Assert.assertEquals;
+
+@RunWith(Properties.class)
+public class CollectionsTest {
+ @Property
+ public void reverseIsInvolution(List<Integer> list) {
+ List<Integer> newList = new ArrayList<>(list);
+ reverse(newList);
+ reverse(newList);
+
+ assertEquals(list, newList);
+ }
+}
diff --git a/src/test/java/au/id/zancanaro/javacheck/OptionalFunctorRulesTest.java b/src/test/java/au/id/zancanaro/javacheck/OptionalRulesTest.java
index 5ef552e..407ffbd 100644
--- a/src/test/java/au/id/zancanaro/javacheck/OptionalFunctorRulesTest.java
+++ b/src/test/java/au/id/zancanaro/javacheck/OptionalRulesTest.java
@@ -14,7 +14,7 @@ import static au.id.zancanaro.javacheck.Generators.oneOf;
import static org.junit.Assert.assertEquals;
@RunWith(Properties.class)
-public class OptionalFunctorRulesTest {
+public class OptionalRulesTest {
@DataSource
public static Generator<Optional<Integer>> listOfIntegers = oneOf(
@@ -24,32 +24,23 @@ public class OptionalFunctorRulesTest {
@DataSource
public static Generator<Function<Integer, Integer>> integerFunction =
oneOf(
- integer().map(OptionalFunctorRulesTest::plusI),
- integer().map(OptionalFunctorRulesTest::timesI),
- integer().map(OptionalFunctorRulesTest::constantlyI));
+ integer().map(OptionalRulesTest::plusI),
+ integer().map(OptionalRulesTest::timesI),
+ integer().map(OptionalRulesTest::constantlyI));
@Property
- public void mappingCompositionsWithStreams(
- Optional<Integer> optional,
- Function<Integer, Integer> f,
- Function<Integer, Integer> g) {
- Optional<Integer> left = optional
- .map(g)
- .map(f);
-
- Optional<Integer> right = optional
- .map(x -> f.apply(g.apply(x)));
-
- assertEquals(left, right);
+ public void flatMapIdentity(Optional<Integer> optional) {
+ assertEquals(optional, optional.flatMap(Optional::of));
}
@Property
- public void mappingCompositionsWithIntermediateList(
+ public void mappingComposition(
Optional<Integer> optional,
Function<Integer, Integer> f,
Function<Integer, Integer> g) {
- Optional<Integer> intermediate = optional.map(g);
- Optional<Integer> left = intermediate.map(f);
+ Optional<Integer> left = optional
+ .map(g)
+ .map(f);
Optional<Integer> right = optional
.map(x -> f.apply(g.apply(x)));
diff --git a/src/test/java/au/id/zancanaro/javacheck/SetFunctorRulesTest.java b/src/test/java/au/id/zancanaro/javacheck/SetFunctorRulesTest.java
new file mode 100644
index 0000000..04fa674
--- /dev/null
+++ b/src/test/java/au/id/zancanaro/javacheck/SetFunctorRulesTest.java
@@ -0,0 +1,106 @@
+package au.id.zancanaro.javacheck;
+
+import au.id.zancanaro.javacheck.annotations.DataSource;
+import au.id.zancanaro.javacheck.annotations.Property;
+import au.id.zancanaro.javacheck.junit.Properties;
+import org.junit.runner.RunWith;
+
+import java.util.Set;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import static au.id.zancanaro.javacheck.Generators.longInteger;
+import static au.id.zancanaro.javacheck.Generators.oneOf;
+import static org.junit.Assert.assertEquals;
+
+@RunWith(Properties.class)
+public class SetFunctorRulesTest {
+
+ @DataSource
+ public static Generator<Function<Long, Long>> integerFunction =
+ oneOf(
+ longInteger().map(SetFunctorRulesTest::plusI),
+ longInteger().map(SetFunctorRulesTest::timesI),
+ longInteger().map(SetFunctorRulesTest::constantlyI));
+
+ @Property
+ public void mappingCompositionsWithStreams(
+ Set<Long> list,
+ Function<Long, Long> f,
+ Function<Long, Long> g) {
+ Set<Long> left = list.stream()
+ .map(g)
+ .map(f)
+ .collect(Collectors.toSet());
+
+ Set<Long> right = list.stream()
+ .map(f.compose(g))
+ .collect(Collectors.toSet());
+
+ assertEquals(left, right);
+ }
+
+ @Property
+ public void mappingCompositionsWithIntermediateList(
+ Set<Long> list,
+ Function<Long, Long> f,
+ Function<Long, Long> g) {
+ Set<Long> intermediate = list.stream().map(g).collect(Collectors.toSet());
+ Set<Long> left = intermediate.stream().map(f).collect(Collectors.toSet());
+
+ Set<Long> right = list.stream()
+ .map(f.compose(g))
+ .collect(Collectors.toSet());
+
+ assertEquals(left, right);
+ }
+
+ @Property
+ public void mapIdentityIsIdentity(Set<Long> list) {
+ Set<Long> mapped = list.stream().map(x -> x).collect(Collectors.toSet());
+
+ assertEquals(list, mapped);
+ }
+
+ private static Function<Long, Long> plusI(final long i) {
+ return new Function<Long, Long>() {
+ @Override
+ public Long apply(Long integer) {
+ return i + integer;
+ }
+
+ @Override
+ public String toString() {
+ return "x -> x + " + i;
+ }
+ };
+ }
+
+ private static Function<Long, Long> timesI(final long i) {
+ return new Function<Long, Long>() {
+ @Override
+ public Long apply(Long integer) {
+ return i * integer;
+ }
+
+ @Override
+ public String toString() {
+ return "x -> x * " + i;
+ }
+ };
+ }
+
+ private static Function<Long, Long> constantlyI(final long i) {
+ return new Function<Long, Long>() {
+ @Override
+ public Long apply(Long integer) {
+ return i;
+ }
+
+ @Override
+ public String toString() {
+ return "x -> " + i;
+ }
+ };
+ }
+}
diff --git a/src/test/java/au/id/zancanaro/javacheck/SimpleListOperationsTest.java b/src/test/java/au/id/zancanaro/javacheck/SimpleListOperationsTest.java
index 3cfef37..93a40e2 100644
--- a/src/test/java/au/id/zancanaro/javacheck/SimpleListOperationsTest.java
+++ b/src/test/java/au/id/zancanaro/javacheck/SimpleListOperationsTest.java
@@ -27,11 +27,11 @@ public class SimpleListOperationsTest {
}
@Property
- public void reverseIsItsOwnInverse(List<String> list) {
- List<String> reversed = new ArrayList<>(list);
- reverse(reversed);
- reverse(reversed);
+ public void reverseIsInvolution(List<String> list) {
+ List<String> newList = new ArrayList<>(list);
+ reverse(newList);
+ reverse(newList);
- assertEquals(list, reversed);
+ assertEquals(list, newList);
}
}