Add FontCacheImplTest

src/main/test/java/net/kemitix/fontface/FontCacheImplTest.java

@@ -0,0 +1,74 @@
+package net.kemitix.fontface;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.awt.*;
+import java.io.File;
+import java.net.URI;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+@ExtendWith(MockitoExtension.class)
+public class FontCacheImplTest {
+
+    private final URI fontLocation = new File("font.otf").toURI();
+    private final String colour = "colour";
+    @Mock
+    private FontLoader fontLoader;
+    @Mock
+    private Font loadedFont;
+
+    @BeforeEach
+    public void setUp() {
+        given(fontLoader.loadFont(any())).willReturn(loadedFont);
+    }
+
+    @Test
+    @DisplayName("When cache is empty then load font")
+    public void emptyCache() {
+        //given
+        final FontCacheImpl fontCache = new FontCacheImpl(fontLoader);
+        final FontFace fontFace = FontFace.of(fontLocation, 26, colour);
+        //when
+        fontCache.loadFont(fontFace);
+        //then
+        verify(fontLoader).loadFont(fontFace);
+    }
+
+    @Test
+    @DisplayName("When cache has font, but not size, then don't reload font")
+    public void notInSize() {
+        //given
+        final FontCacheImpl fontCache = new FontCacheImpl(fontLoader);
+        final FontFace previousFontFace = FontFace.of(fontLocation, 16, colour);
+        fontCache.loadFont(previousFontFace);
+        final FontFace fontFace = FontFace.of(fontLocation, 26, colour);
+        //when
+        fontCache.loadFont(fontFace);
+        //then
+        verify(fontLoader, times(1)).loadFont(previousFontFace);
+        verifyNoMoreInteractions(fontLoader);
+    }
+
+    @Test
+    @DisplayName("When cache has font in size, then don't load font")
+    public void available() {
+        //given
+        final FontCacheImpl fontCache = new FontCacheImpl(fontLoader);
+        final FontFace fontFace = FontFace.of(fontLocation, 26, colour);
+        //when
+        fontCache.loadFont(fontFace);
+        fontCache.loadFont(fontFace);
+        //then
+        verify(fontLoader, times(1)).loadFont(fontFace);
+    }
+}