initial impl

3 files changed, 250 insertions, 0 deletions

diff --git a/src/test/java/org/pacien/lemonad/attempt/AttemptTest.java b/src/test/java/org/pacien/lemonad/attempt/AttemptTest.java
new file mode 100644
index 0000000..1b165e8
--- /dev/null
+++ b/src/test/java/org/pacien/lemonad/attempt/AttemptTest.java
@@ -0,0 +1,114 @@
+/*
+ * lemonad - Some functional sweetness for Java
+ * Copyright (C) 2019  Pacien TRAN-GIRARD
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.pacien.lemonad.attempt;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.NoSuchElementException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * @author pacien
+ */
+class AttemptTest {
+  @Test void testSimpleSuccess() {
+    var result = "result";
+    var success = Attempt.success(result);
+    assertFalse(success.isFailure());
+    assertTrue(success.isSuccess());
+    assertThrows(NoSuchElementException.class, success::getError);
+    assertEquals(result, success.getResult());
+    success.ifFailure(__ -> fail());
+    success.ifSuccess(innerResult -> assertEquals(result, innerResult));
+  }
+
+  @Test void testSimpleFailure() {
+    var fault = 0;
+    var failure = Attempt.failure(fault);
+    assertTrue(failure.isFailure());
+    assertFalse(failure.isSuccess());
+    assertEquals(fault, failure.getError());
+    assertThrows(NoSuchElementException.class, failure::getResult);
+    failure.ifFailure(innerFault -> assertEquals(fault, innerFault));
+    failure.ifSuccess(__ -> fail());
+  }
+
+  @Test void testNormalAttempt() {
+    var result = "result";
+    var success = Attempt.attempt(() -> result);
+    assertFalse(success.isFailure());
+    assertTrue(success.isSuccess());
+    assertThrows(NoSuchElementException.class, success::getError);
+    assertEquals(result, success.getResult());
+    success.ifFailure(__ -> fail());
+    success.ifSuccess(innerResult -> assertEquals(result, innerResult));
+  }
+
+  @Test void testFailedAttempt() {
+    var exception = new Exception();
+    var failure = Attempt.attempt(() -> {
+      throw exception;
+    });
+    assertTrue(failure.isFailure());
+    assertFalse(failure.isSuccess());
+    assertEquals(exception, failure.getError());
+    assertThrows(NoSuchElementException.class, failure::getResult);
+    failure.ifFailure(innerFault -> assertEquals(exception, innerFault));
+    failure.ifSuccess(__ -> fail());
+  }
+
+  @Test void testTransformationFlow() {
+    var result0 = 0;
+    var result1 = "res";
+    var result2 = 0L;
+    var fault0 = 0;
+    var fault1 = 1;
+    var fault2 = 2;
+
+    Attempt.success(result0)
+           .mapFailure(__ -> fail())
+           .mapResult(res -> Attempt.success(result1))
+           .mapResult(res -> {
+             assertEquals(result1, res);
+             return Attempt.failure(fault0);
+           })
+           .ifSuccess(__ -> fail())
+           .mapResult(__ -> fail())
+           .mapFailure(f -> {
+             assertEquals(fault0, f);
+             return Attempt.failure(fault1);
+           })
+           .mapFailure(f -> {
+             assertEquals(fault1, f);
+             return Attempt.success(result2);
+           })
+           .ifFailure(__ -> fail())
+           .flatMap(attempt -> {
+             assertEquals(result2, attempt.getResult());
+             return Attempt.failure(fault2);
+           })
+           .ifSuccess(__ -> fail())
+           .ifFailure(f -> assertEquals(fault2, f));
+  }
+}
diff --git a/src/test/java/org/pacien/lemonad/validation/ValidationResultTest.java b/src/test/java/org/pacien/lemonad/validation/ValidationResultTest.java
new file mode 100644
index 0000000..65b2cb3
--- /dev/null
+++ b/src/test/java/org/pacien/lemonad/validation/ValidationResultTest.java
@@ -0,0 +1,75 @@
+/*
+ * lemonad - Some functional sweetness for Java
+ * Copyright (C) 2019  Pacien TRAN-GIRARD
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.pacien.lemonad.validation;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * @author pacien
+ */
+class ValidationResultTest {
+  @Test void testValidResult() {
+    var subject = "subject";
+    var validationResult = ValidationResult.valid(subject);
+    assertTrue(validationResult.getErrors().isEmpty());
+    assertTrue(validationResult.isValid());
+    assertFalse(validationResult.isInvalid());
+    validationResult.ifValid(innerSubject -> assertEquals(subject, innerSubject));
+    validationResult.ifInvalid((__, ___) -> fail());
+  }
+
+  @Test void testInvalidResult() {
+    var subject = "subject";
+    var errors = List.of(0, 1);
+    var validationResult = ValidationResult.invalid(subject, 0, 1);
+    assertEquals(errors, validationResult.getErrors());
+    assertFalse(validationResult.isValid());
+    assertTrue(validationResult.isInvalid());
+    validationResult.ifValid(Assertions::fail);
+    validationResult.ifInvalid((innerSubject, innerErrors) -> {
+      assertEquals(subject, innerSubject);
+      assertEquals(errors, innerErrors);
+    });
+  }
+
+  @Test void testFlatMap() {
+    ValidationResult.valid("subject")
+                    .ifInvalid((__, ___) -> fail())
+                    .flatMap(res -> ValidationResult.invalid(res.getSubject(), 0))
+                    .ifValid(innerSubject -> fail());
+  }
+
+  @Test void testMerge() {
+    var subject = "subject";
+    assertEquals(List.of(0, 1, 2, 3), ValidationResult.merge(subject, Stream.of(
+      ValidationResult.valid(subject),
+      ValidationResult.invalid(subject, 0, 1),
+      ValidationResult.invalid(subject, 2, 3))
+    ).getErrors());
+  }
+}
diff --git a/src/test/java/org/pacien/lemonad/validation/ValidatorTest.java b/src/test/java/org/pacien/lemonad/validation/ValidatorTest.java
new file mode 100644
index 0000000..55927b5
--- /dev/null
+++ b/src/test/java/org/pacien/lemonad/validation/ValidatorTest.java
@@ -0,0 +1,61 @@
+/*
+ * lemonad - Some functional sweetness for Java
+ * Copyright (C) 2019  Pacien TRAN-GIRARD
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the