#1 Coverage is too low

pom.xml

@@ -107,7 +107,6 @@
               </excludes>
             </configuration>
           </plugin>
-          <!--
           <plugin>
             <groupId>org.jacoco</groupId>
             <artifactId>jacoco-maven-plugin</artifactId>
@@ -176,7 +175,6 @@
               </execution>
             </executions>
           </plugin>
-          -->
         </plugins>
       </build>
     </profile>

src/main/java/org/llorllale/cactoos/matchers/MatcherOf.java

@@ -55,7 +55,7 @@ public final class MatcherOf<T> extends TypeSafeMatcher<T> {
      * @param proc The func
      */
     public MatcherOf(final Proc<T> proc) {
-        this(new FuncOf<>(proc));
+        this(new FuncOf<>(proc, true));
     }
 
     /**

src/test/java/org/llorllale/cactoos/matchers/FuncAppliesTest.java

@@ -0,0 +1,51 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) for portions of project cactoos-matchers are held by
+ * Yegor Bugayenko, 2017-2018, as part of project cactoos.
+ * All other copyright for project cactoos-matchers are held by
+ * George Aristy, 2018.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.llorllale.cactoos.matchers;
+
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.core.IsEqual;
+import org.junit.Test;
+
+/**
+ * Test case for {@link org.llorllale.cactoos.matchers.FuncApplies}.
+ *
+ * @author Alexander Menshikov ([email protected])
+ * @version $Id$
+ * @since 1.0
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class FuncAppliesTest {
+    @Test
+    public void matchFuncs() {
+        final FuncApplies<Integer, Integer> matcher = new FuncApplies<>(1, 1);
+        MatcherAssert.assertThat(
+            "Can't match equaled values",
+            matcher.matchesSafely(x -> x),
+            new IsEqual<>(true)
+        );
+    }
+}

src/test/java/org/cactoos/matchers/InputHasContentTest.java → src/test/java/org/llorllale/cactoos/matchers/InputHasContentTest.java

@@ -24,14 +24,13 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package org.cactoos.matchers;
+package org.llorllale.cactoos.matchers;
 
 import org.cactoos.Input;
 import org.cactoos.io.InputOf;
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.core.IsNot;
 import org.junit.Test;
-import org.llorllale.cactoos.matchers.InputHasContent;
 
 /**
  * Test case for {@link org.llorllale.cactoos.matchers.InputHasContent}.

src/test/java/org/llorllale/cactoos/matchers/RunsInThreadsTest.java

@@ -0,0 +1,99 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) for portions of project cactoos-matchers are held by
+ * Yegor Bugayenko, 2017-2018, as part of project cactoos.
+ * All other copyright for project cactoos-matchers are held by
+ * George Aristy, 2018.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.llorllale.cactoos.matchers;
+
+import java.util.ConcurrentModificationException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ThreadLocalRandom;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.core.IsEqual;
+import org.junit.Test;
+
+/**
+ * Test case for {@link org.llorllale.cactoos.matchers.RunsInThreads}.
+ *
+ * @author Alexander Menshikov ([email protected])
+ * @version $Id$
+ * @since 1.0
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class RunsInThreadsTest {
+
+    @Test
+    public void matchPositive() {
+        final RunsInThreads<Map<Integer, Integer>> matcher =
+            new RunsInThreads<>(new ConcurrentHashMap<>());
+        MatcherAssert.assertThat(
+            "Can't concurrently modify ConcurrentHashMap",
+            matcher.matchesSafely(RunsInThreadsTest::modify),
+            new IsEqual<>(true)
+        );
+    }
+
+    @Test
+    public void matchNegative() {
+        final RunsInThreads<Map<Integer, Integer>> matcher =
+            new RunsInThreads<>(new HashMap<>());
+        MatcherAssert.assertThat(
+            "Can concurrently modify HashMap",
+            matcher.matchesSafely(RunsInThreadsTest::modify),
+            new IsEqual<>(false)
+        );
+    }
+
+    /**
+     * Check possibility of concurrent modification.
+     *
+     * @param map Tested map.
+     * @return Return {@code true} if the map can be concurrently modified.
+     */
+    private static boolean modify(final Map<Integer, Integer> map) {
+        boolean flag = true;
+        try {
+            for (final Map.Entry<Integer, Integer> entry : map.entrySet()) {
+                if (entry.getKey() == null || entry.getValue() == null) {
+                    flag = false;
+                    break;
+                }
+            }
+            if (flag) {
+                //@checkstyle MagicNumberCheck (1 line)
+                for (int count = 0; count < 100; ++count) {
+                    map.put(
+                        ThreadLocalRandom.current().nextInt(),
+                        ThreadLocalRandom.current().nextInt()
+                    );
+                }
+            }
+        } catch (final ConcurrentModificationException ignored) {
+            flag = false;
+        }
+        return flag;
+    }
+}

src/test/java/org/llorllale/cactoos/matchers/ScalarHasValueTest.java

@@ -0,0 +1,52 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) for portions of project cactoos-matchers are held by
+ * Yegor Bugayenko, 2017-2018, as part of project cactoos.
+ * All other copyright for project cactoos-matchers are held by
+ * George Aristy, 2018.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.llorllale.cactoos.matchers;
+
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.core.IsEqual;
+import org.junit.Test;
+
+/**
+ * Test case for {@link org.llorllale.cactoos.matchers.ScalarHasValue}.
+ *
+ * @author Alexander Menshikov ([email protected])
+ * @version $Id$
+ * @since 1.0
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class ScalarHasValueTest {
+
+    @Test
+    public void matchPositive() {
+        final ScalarHasValue<Integer> matcher = new ScalarHasValue<>(1);
+        MatcherAssert.assertThat(
+            "Can't match equaled values",
+            matcher.matchesSafely(() -> 1),
+            new IsEqual<>(true)
+        );
+    }
+}

src/test/java/org/cactoos/matchers/TeeInputHasResultTest.java → src/test/java/org/llorllale/cactoos/matchers/TeeInputHasResultTest.java

@@ -24,7 +24,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package org.cactoos.matchers;
+package org.llorllale.cactoos.matchers;
 
 import java.io.ByteArrayOutputStream;
 import org.cactoos.io.OutputTo;

src/test/java/org/cactoos/matchers/TextHasStringTest.java → src/test/java/org/llorllale/cactoos/matchers/TextHasStringTest.java

@@ -24,7 +24,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package org.cactoos.matchers;
+package org.llorllale.cactoos.matchers;
 
 import org.cactoos.io.InputOf;
 import org.cactoos.io.Md5DigestOf;
@@ -34,7 +34,6 @@
 import org.hamcrest.StringDescription;
 import org.hamcrest.core.StringContains;
 import org.junit.Test;
-import org.llorllale.cactoos.matchers.TextHasString;
 
 /**
  * Test case for {@link TextHasString}.

src/test/java/org/cactoos/matchers/package-info.java → src/test/java/org/llorllale/cactoos/matchers/package-info.java

@@ -32,4 +32,4 @@
  * @version $Id$
  * @since 0.1
  */
-package org.cactoos.matchers;
+package org.llorllale.cactoos.matchers;