Added tests.

src/main/java/net/thauvin/erik/mobibot/modules/Calc.java

@@ -58,28 +58,34 @@ public class Calc extends AbstractModule {
         commands.add(CALC_CMD);
     }
 
+    /**
+     * Calculate.
+     *
+     * @param query The query.
+     * @return The calculation result.
+     */
+    public static String calc(final String query) {
+        final DecimalFormat decimalFormat = new DecimalFormat("#.##");
+
+        try {
+            final Expression calc = new ExpressionBuilder(query).build();
+            return query.replaceAll(" ", "") + " = " + decimalFormat.format(calc.evaluate());
+        } catch (Exception e) {
+            return "No idea. This is the kind of math I don't get.";
+        }
+    }
+
     /**
      * {@inheritDoc}
      */
     @Override
     public void commandResponse(final Mobibot bot, final String sender, final String args, final boolean isPrivate) {
         if (Utils.isValidString(args)) {
-            final DecimalFormat decimalFormat = new DecimalFormat("#.##");
+            bot.send(bot.getChannel(), calc(args));
 
-            try {
-                final Expression calc = new ExpressionBuilder(args).build();
-                bot.send(bot.getChannel(), args.replaceAll(" ", "") + " = " + decimalFormat.format(calc.evaluate()));
-            } catch (Exception e) {
-                if (bot.getLogger().isDebugEnabled()) {
-                    bot.getLogger().debug("Unable to calculate: " + args, e);
-                }
-
-                bot.send(bot.getChannel(), "No idea. This is the kind of math I don't get.");
-            }
         } else {
             helpResponse(bot, sender, args, isPrivate);
         }
-
     }
 
     /**

src/test/java/net/thauvin/erik/mobibot/modules/CalcTest.java

@@ -0,0 +1,53 @@
+/*
+ * CalcTest.java
+ *
+ * Copyright (c) 2004-2019, Erik C. Thauvin (erik@thauvin.net)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ *   Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ *   Neither the name of this project nor the names of its contributors may be
+ *   used to endorse or promote products derived from this software without
+ *   specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.thauvin.erik.mobibot.modules;
+
+import org.testng.annotations.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * The <code>CalcTest</code> class.
+ *
+ * @author <a href="https://erik.thauvin.net/" target="_blank">Erik C. Thauvin</a>
+ * @created 2019-04-07
+ * @since 1.0
+ */
+public class CalcTest {
+    @Test
+    public void testCalc() {
+        assertThat(Calc.calc("1 + 1")).as("calc(1+1)").isEqualTo("1+1 = 2");
+        assertThat(Calc.calc("1 -3")).as("calc(1 -3)").isEqualTo("1-3 = -2");
+        assertThat(Calc.calc("pi+π+e+φ")).as("calc(pi+π+e+φ)").isEqualTo("pi+π+e+φ = 10.62");
+        assertThat(Calc.calc("one + one")).as("calc(one + one)").startsWith("No idea.");
+    }
+}