I... I can't help it, man. I inject dependencies, OK?

There, I said it.

SaneEconomyCore/src/main/java/org/appledash/saneeconomy/ISaneEconomy.java

@@ -0,0 +1,28 @@
+package org.appledash.saneeconomy;
+
+import org.appledash.saneeconomy.economy.EconomyManager;
+import org.appledash.saneeconomy.economy.logger.TransactionLogger;
+
+/**
+ * Created by appledash on 9/18/16.
+ * Blackjack is best pony.
+ */
+public interface ISaneEconomy {
+    /**
+     * Get the active EconomyManager.
+     * @return EconomyManager
+     */
+    EconomyManager getEconomyManager();
+
+    /**
+     * Check whether transactions should be logged.
+     * @return True if transactions should be logged, false otherwise.
+     */
+    boolean shouldLogTransactions();
+
+    /**
+     * Get the active TransactionLogger.
+     * @return TransactionLogger, if there is one.
+     */
+    TransactionLogger getTransactionLogger();
+}

SaneEconomyCore/src/main/java/org/appledash/saneeconomy/SaneEconomy.java

@@ -25,7 +25,7 @@ import java.util.logging.Logger;
  * Created by AppleDash on 6/13/2016.
  * Blackjack is still best pony.
  */
-public class SaneEconomy extends JavaPlugin {
+public class SaneEconomy extends JavaPlugin implements ISaneEconomy {
     private static SaneEconomy instance;
     private EconomyManager economyManager;
     private VaultHook vaultHook;
@@ -131,7 +131,7 @@ public class SaneEconomy extends JavaPlugin {
             saveConfig();
         }
 
-        economyManager = new EconomyManager(currency, backend);
+        economyManager = new EconomyManager(this, currency, backend);
 
         return true;
     }
@@ -199,6 +199,7 @@ public class SaneEconomy extends JavaPlugin {
      * Get the active EconomyManager.
      * @return EconomyManager
      */
+    @Override
     public EconomyManager getEconomyManager() {
         return economyManager;
     }
@@ -207,6 +208,7 @@ public class SaneEconomy extends JavaPlugin {
      * Check whether transactions should be logged.
      * @return True if transactions should be logged, false otherwise.
      */
+    @Override
     public boolean shouldLogTransactions() {
         return transactionLogger != null;
     }
@@ -215,6 +217,7 @@ public class SaneEconomy extends JavaPlugin {
      * Get the active TransactionLogger.
      * @return TransactionLogger, if there is one.
      */
+    @Override
     public TransactionLogger getTransactionLogger() {
         return transactionLogger;
     }

SaneEconomyCore/src/main/java/org/appledash/saneeconomy/economy/EconomyManager.java

@@ -1,5 +1,6 @@
 package org.appledash.saneeconomy.economy;
 
+import org.appledash.saneeconomy.ISaneEconomy;
 import org.appledash.saneeconomy.SaneEconomy;
 import org.appledash.saneeconomy.economy.backend.EconomyStorageBackend;
 import org.appledash.saneeconomy.economy.economable.Economable;
@@ -18,10 +19,12 @@ import java.util.UUID;
  * Represents our EconomyManager, which manages players' balances.
  */
 public class EconomyManager {
+    private ISaneEconomy saneEconomy;
     private final Currency currency;
     private final EconomyStorageBackend backend;
 
-    public EconomyManager(Currency currency, EconomyStorageBackend backend) {
+    public EconomyManager(ISaneEconomy saneEconomy, Currency currency, EconomyStorageBackend backend) {
+        this.saneEconomy = saneEconomy;
         this.currency = currency;
         this.backend = backend;
     }
@@ -138,11 +141,11 @@ public class EconomyManager {
 
         backend.setBalance(targetPlayer, amount);
 
-        if (SaneEconomy.getInstance().shouldLogTransactions() && reason != TransactionReason.PLAYER_PAY) { // Player pay is handled in the transfer() method.
+        if (saneEconomy.shouldLogTransactions() && reason != TransactionReason.PLAYER_PAY) { // Player pay is handled in the transfer() method.
             if (oldAmount > amount) { // Lower amount now
-                SaneEconomy.getInstance().getTransactionLogger().logSubtraction(targetPlayer, amount, reason);
+                saneEconomy.getTransactionLogger().logSubtraction(targetPlayer, amount, reason);
             } else if (oldAmount < amount) { // Higher amount now
-                SaneEconomy.getInstance().getTransactionLogger().logAddition(targetPlayer, amount, reason);
+                saneEconomy.getTransactionLogger().logAddition(targetPlayer, amount, reason);
             }
         }
     }
@@ -170,8 +173,8 @@ public class EconomyManager {
         subtractBalance(from, amount, TransactionReason.PLAYER_PAY);
         addBalance(to, amount, TransactionReason.PLAYER_PAY);
 
-        if (SaneEconomy.getInstance().shouldLogTransactions()) {
+        if (saneEconomy.shouldLogTransactions()) {
-            SaneEconomy.getInstance().getTransactionLogger().logTransfer(from, to, amount, TransactionReason.PLAYER_PAY);
+            saneEconomy.getTransactionLogger().logTransfer(from, to, amount, TransactionReason.PLAYER_PAY);
         }
 
         return true;

SaneEconomyCore/src/test/java/org/appledash/saneeconomy/test/EconomyManagerTest.java

@@ -6,7 +6,9 @@ import org.appledash.saneeconomy.economy.TransactionReason;
 import org.appledash.saneeconomy.economy.economable.Economable;
 import org.appledash.saneeconomy.test.mock.MockEconomyStorageBackend;
 import org.appledash.saneeconomy.test.mock.MockOfflinePlayer;
+import org.appledash.saneeconomy.test.mock.MockSaneEconomy;
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 
 import java.text.DecimalFormat;
@@ -16,9 +18,17 @@ import java.text.DecimalFormat;
  * Blackjack is still best pony.
  */
 public class EconomyManagerTest {
+    private EconomyManager economyManager;
+
+    @Before
+    public void setupEconomyManager()  {
+        economyManager = new EconomyManager(new MockSaneEconomy(),
+                new Currency("test dollar", "test dollars", new DecimalFormat("0.00")),
+                new MockEconomyStorageBackend());
+    }
+
     @Test
     public void testEconomyManager() {
-        EconomyManager economyManager = new EconomyManager(new Currency("test dollar", "test dollars", new DecimalFormat("0.00")), new MockEconomyStorageBackend());
         Economable playerOne = Economable.wrap(new MockOfflinePlayer("One"));
         Economable playerTwo = Economable.wrap(new MockOfflinePlayer("Two"));
 
@@ -59,7 +69,6 @@ public class EconomyManagerTest {
 
     @Test(expected = IllegalArgumentException.class)
     public void testNegativeBalance() {
-        EconomyManager economyManager = new EconomyManager(new Currency("test dollar", "test dollars", new DecimalFormat("0.00")), new MockEconomyStorageBackend());
         Economable economable = Economable.wrap(new MockOfflinePlayer("Bob"));
         economyManager.setBalance(economable, -1.0, TransactionReason.PLUGIN);
     }

SaneEconomyCore/src/test/java/org/appledash/saneeconomy/test/mock/MockSaneEconomy.java

@@ -0,0 +1,26 @@
+package org.appledash.saneeconomy.test.mock;
+
+import org.appledash.saneeconomy.ISaneEconomy;
+import org.appledash.saneeconomy.economy.EconomyManager;
+import org.appledash.saneeconomy.economy.logger.TransactionLogger;
+
+/**
+ * Created by appledash on 9/18/16.
+ * Blackjack is best pony.
+ */
+public class MockSaneEconomy implements ISaneEconomy {
+    @Override
+    public EconomyManager getEconomyManager() {
+        return null;
+    }
+
+    @Override
+    public boolean shouldLogTransactions() {
+        return false;
+    }
+
+    @Override
+    public TransactionLogger getTransactionLogger() {
+        return null;
+    }
+}