#23[30m]. Add unit test for ExchangeRateProvider.

Author: Evgenii Kanivets

app/build.gradle

@@ -54,4 +54,6 @@ dependencies {
     compile 'com.google.dagger:dagger:2.0.1'
     apt 'com.google.dagger:dagger-compiler:2.0.1'
     provided 'org.glassfish:javax.annotation:10.0-b28'
+
+    testCompile 'junit:junit:4.12'
 }

app/src/main/java/com/blogspot/e_kanivets/moneytracker/model/ExchangeRate.java

@@ -50,6 +50,18 @@ public double getAmount() {
         return amount;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (o instanceof ExchangeRate) {
+            ExchangeRate rate = (ExchangeRate) o;
+            return this.id == rate.getId()
+                    && this.createdAt == rate.getCreatedAt()
+                    && this.fromCurrency.equals(rate.getFromCurrency())
+                    && this.toCurrency.equals(rate.getToCurrency())
+                    && this.amount == rate.getAmount();
+        } else return false;
+    }
+
     @SuppressWarnings("StringBufferReplaceableByString")
     @Override
     public String toString() {

app/src/test/java/com/blogspot/e_kanivets/moneytracker/report/ExchangeRateProviderTest.java

@@ -0,0 +1,120 @@
+package com.blogspot.e_kanivets.moneytracker.report;
+
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import com.blogspot.e_kanivets.moneytracker.controller.ExchangeRateController;
+import com.blogspot.e_kanivets.moneytracker.model.ExchangeRate;
+import com.blogspot.e_kanivets.moneytracker.model.Record;
+import com.blogspot.e_kanivets.moneytracker.repo.base.IRepo;
+import com.blogspot.e_kanivets.moneytracker.report.base.IExchangeRateProvider;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+/**
+ * JUnit4 test case.
+ * Created on 2/25/16.
+ *
+ * @author Evgenii Kanivets
+ */
+public class ExchangeRateProviderTest {
+    private ExchangeRateController rateController;
+
+    @Before
+    public void setUp() throws Exception {
+        rateController = new ExchangeRateController(new TestRepo());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        rateController = null;
+    }
+
+    @Test
+    public void testGetRate() throws Exception {
+        IExchangeRateProvider provider;
+
+        try {
+            provider = new ExchangeRateProvider(null, rateController);
+        } catch (NullPointerException e) {
+            provider = null;
+        }
+
+        assertNull(provider);
+
+        try {
+            provider = new ExchangeRateProvider("", null);
+        } catch (NullPointerException e) {
+            provider = null;
+        }
+
+        assertNull(provider);
+
+        try {
+            provider = new ExchangeRateProvider(null, null);
+        } catch (NullPointerException e) {
+            provider = null;
+        }
+
+        assertNull(provider);
+
+        provider = new ExchangeRateProvider("USD", rateController);
+
+        assertEquals(new ExchangeRate(1, "UAH", "USD", 4),
+                provider.getRate(new Record(0, 0, "", "", 0, 0, "UAH")));
+
+        assertEquals(new ExchangeRate(0, "AFN", "USD", 3),
+                provider.getRate(new Record(0, 0, "", "", 0, 0, "AFN")));
+
+        assertNull(provider.getRate(new Record(0, 0, "", "", 0, 0, "SMTH")));
+    }
+
+    private static class TestRepo implements IRepo<ExchangeRate> {
+        @Nullable
+        @Override
+        public ExchangeRate create(ExchangeRate instance) {
+            return null;
+        }
+
+        @Nullable
+        @Override
+        public ExchangeRate read(long id) {
+            return null;
+        }
+
+        @Nullable
+        @Override
+        public ExchangeRate update(ExchangeRate instance) {
+            return null;
+        }
+
+        @Override
+        public boolean delete(ExchangeRate instance) {
+            return false;
+        }
+
+        @NonNull
+        @Override
+        public List<ExchangeRate> readAll() {
+            List<ExchangeRate> rateList = new ArrayList<>();
+            rateList.add(new ExchangeRate(1, "UAH", "USD", 4));
+            rateList.add(new ExchangeRate(0, "UAH", "USD", 2));
+            rateList.add(new ExchangeRate(0, "AFN", "USD", 3));
+            rateList.add(new ExchangeRate(0, "USD", "EUR", 20));
+            return rateList;
+        }
+
+        @NonNull
+        @Override
+        public List<ExchangeRate> readWithCondition(String condition, String[] args) {
+            return new ArrayList<>();
+        }
+    }
+}

build.gradle

@@ -3,7 +3,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.3.0'
+        classpath 'com.android.tools.build:gradle:1.5.0'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
     }
 }