BAEL-1579: Hamcrest custom matchers. (#3905)

* BAEL-1579: Hamcrest custom matchers.

* BAEL-1589: Removing hamcrest dependency test scope.

testing-modules/mockito/src/main/java/org/baeldung/hamcrest/custommatchers/IsDivisibleBy.java

@@ -0,0 +1,28 @@
+package org.baeldung.hamcrest.custommatchers;
+
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+import org.hamcrest.TypeSafeMatcher;
+
+public class IsDivisibleBy extends TypeSafeMatcher<Integer> {
+
+    private Integer divider;
+
+    private IsDivisibleBy(Integer divider) {
+        this.divider = divider;
+    }
+
+    @Override
+    protected boolean matchesSafely(Integer dividend) {
+        return ((dividend % divider) == 0);
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText("divisible by " + divider);
+    }
+
+    public static Matcher<Integer> divisibleBy(Integer divider) {
+        return new IsDivisibleBy(divider);
+    }
+}

testing-modules/mockito/src/main/java/org/baeldung/hamcrest/custommatchers/IsOnlyNumbers.java

@@ -0,0 +1,27 @@
+package org.baeldung.hamcrest.custommatchers;
+
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+import org.hamcrest.TypeSafeMatcher;
+
+public class IsOnlyNumbers extends TypeSafeMatcher<String> {
+
+    @Override
+    protected boolean matchesSafely(String s) {
+        try {
+            Integer.parseInt(s);
+            return true;
+        } catch (NumberFormatException nfe) {
+            return false;
+        }
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText("only numbers");
+    }
+
+    public static Matcher<String> onlyNumbers() {
+        return new IsOnlyNumbers();
+    }
+}

testing-modules/mockito/src/main/java/org/baeldung/hamcrest/custommatchers/IsUppercase.java

@@ -0,0 +1,22 @@
+package org.baeldung.hamcrest.custommatchers;
+
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+import org.hamcrest.TypeSafeMatcher;
+
+public class IsUppercase extends TypeSafeMatcher<String> {
+
+    @Override
+    protected boolean matchesSafely(String s) {
+        return s.equals(s.toUpperCase());
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText("all uppercase");
+    }
+
+    public static Matcher<String> uppercase() {
+        return new IsUppercase();
+    }
+}