Testing Files with Hamcrest

Testing File Attributes using Hamcrest

package net.time4tea.rsync.matcher;

import org.hamcrest.Matcher;
import org.hamcrest.Matchers;
import org.hamcrest.Description;
import org.junit.matchers.TypeSafeMatcher;

import java.io.File;
import java.io.IOException;


public class FileMatchers {

    public static Matcher<File> isDirectory() {
        return new TypeSafeMatcher<File>() {
            File fileTested;

            public boolean matchesSafely(File item) {
                fileTested = item;
                return item.isDirectory();
            }

            public void describeTo(Description description) {
                description.appendText(" that ");
                description.appendValue(fileTested);
                description.appendText("is a directory");
            }
        };
    }

    public static Matcher<File> exists() {
        return new TypeSafeMatcher<File>() {
            File fileTested;

            public boolean matchesSafely(File item) {
                fileTested = item;
                return item.exists();
            }

            public void describeTo(Description description) {
                description.appendText(" that file ");
                description.appendValue(fileTested);
                description.appendText(" exists");
            }
        };
    }

    public static Matcher<File> isFile() {
        return new TypeSafeMatcher<File>() {
            File fileTested;
            public boolean matchesSafely(File item) {
                fileTested = item;
                return item.isFile();
            }

            public void describeTo(Description description) {
                description.appendText(" that ");
                description.appendValue(fileTested);
                description.appendText("is a file");
            }
        };
    }

    public static Matcher<File> readable() {
        return new TypeSafeMatcher<File>() {
            File fileTested;
            public boolean matchesSafely(File item) {
                fileTested = item;
                return item.canRead();
            }

            public void describeTo(Description description) {
                description.appendText(" that file ");
                description.appendValue(fileTested);
                description.appendText("is readable");
            }
        };
    }

    public static Matcher<File> writable() {
        return new TypeSafeMatcher<File>() {
            File fileTested;
            public boolean matchesSafely(File item) {
                fileTested = item;
                return item.canWrite();
            }

            public void describeTo(Description description) {
                description.appendText(" that file ");
                description.appendValue(fileTested);
                description.appendText("is writable");
            }
        };
    }

    public static Matcher<File> sized(long size) {
        return sized(Matchers.equalTo(size));
    }

    public static Matcher<File> sized(final Matcher<Long> size) {
        return new TypeSafeMatcher<File>() {
            File fileTested;
            long length;
            public boolean matchesSafely(File item) {
                fileTested = item;
                length = item.length();
                return size.matches(length);
            }

            public void describeTo(Description description) {
                description.appendText(" that file ");
                description.appendValue(fileTested);
                description.appendText(" is sized ");
                description.appendDescriptionOf(size);
                description.appendText(", not " + length);
            }
        };
    }

    public static Matcher<File> named(final Matcher<String> name) {
        return new TypeSafeMatcher<File>() {
            File fileTested;
            public boolean matchesSafely(File item) {
                fileTested = item;
                return name.matches(item.getName());
            }

            public void describeTo(Description description) {
                description.appendText(" that file ");
                description.appendValue(fileTested);
                description.appendText(" is named");
                description.appendDescriptionOf(name);
                description.appendText(" not " );
                description.appendValue(fileTested.getName());
            }
        };
    }

    public static Matcher<File> withCanonicalPath(final Matcher<String> path) {
        return new TypeSafeMatcher<File>() {
            public boolean matchesSafely(File item) {
                try {
                    return path.matches(item.getCanonicalPath());
                } catch (IOException e) {
                    return false;
                }
            }

            public void describeTo(Description description) {
                description.appendText("with canonical path '");
                description.appendDescriptionOf(path);
                description.appendText("'");
            }
        };
    }

    public static Matcher<File> withAbsolutePath(final Matcher<String> path) {
        return new TypeSafeMatcher<File>() {
            File fileTested;
            public boolean matchesSafely(File item) {
                fileTested = item;
                return path.matches(item.getAbsolutePath());
            }

            public void describeTo(Description description) {
                description.appendText("with absolute path '");
                description.appendDescriptionOf(path);
                description.appendText("'");
            }
        };
    }
}
Testing Files with Hamcrest

Testing File Attributes using Hamcrest

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