diff --git a/src/test/java/com/github/natche/gravatarjavaclient/profile/GravatarProfileTokenProviderTest.java b/src/test/java/com/github/natche/gravatarjavaclient/profile/GravatarProfileTokenProviderTest.java
new file mode 100644
index 0000000..e7e06bc
--- /dev/null
+++ b/src/test/java/com/github/natche/gravatarjavaclient/profile/GravatarProfileTokenProviderTest.java
@@ -0,0 +1,92 @@
+package com.github.natche.gravatarjavaclient.profile;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Tests for {@link GravatarProfileTokenProvider}s.
+ */
+public class GravatarProfileTokenProviderTest {
+    /**
+     * Creates a new instance for testing purposes.
+     */
+    GravatarProfileTokenProviderTest() {}
+
+    /**
+     *
+     */
+    @Test
+    void testCreation() {
+        assertThrows(NullPointerException.class,
+                () -> new GravatarProfileTokenProvider(null, null));
+        assertThrows(NullPointerException.class,
+                () -> new GravatarProfileTokenProvider(() -> new byte[0], null));
+        assertThrows(IllegalArgumentException.class,
+                () -> new GravatarProfileTokenProvider(() -> new byte[0], ""));
+        assertThrows(IllegalArgumentException.class,
+                () -> new GravatarProfileTokenProvider(() -> new byte[0], "    "));
+        assertDoesNotThrow(
+                () -> new GravatarProfileTokenProvider(() -> new byte[0], "source"));
+    }
+
+    /**
+     *
+     */
+    @Test
+    void testGetToken() {
+        byte[] bytes = "PostMalone".getBytes(StandardCharsets.US_ASCII);
+        GravatarProfileTokenProvider provider = new GravatarProfileTokenProvider(() -> bytes, "source");
+        assertEquals(bytes, provider.getToken());
+    }
+
+    /**
+     *
+     */
+    @Test
+    void testToString() {
+        byte[] bytes = "PostMalone".getBytes(StandardCharsets.US_ASCII);
+        GravatarProfileTokenProvider provider = new GravatarProfileTokenProvider(() -> bytes, "source");
+        GravatarProfileTokenProvider nonEqualProvider
+                = new GravatarProfileTokenProvider(() -> new byte[0], "another source");
+
+        assertEquals("GravatarProfileTokenProvider{source=\"source\"}", provider.toString());
+        assertEquals("GravatarProfileTokenProvider{source=\"another source\"}", nonEqualProvider.toString());
+    }
+
+    /**
+     *
+     */
+    @Test
+    void testEquals() {
+        byte[] bytes = "PostMalone".getBytes(StandardCharsets.US_ASCII);
+        GravatarProfileTokenProvider provider = new GravatarProfileTokenProvider(() -> bytes, "source");
+        GravatarProfileTokenProvider equalProvider = new GravatarProfileTokenProvider(() -> bytes, "source");
+        GravatarProfileTokenProvider nonEqualProvider
+                = new GravatarProfileTokenProvider(() -> new byte[0], "another source");
+
+        assertEquals(provider, provider);
+        assertEquals(provider, equalProvider);
+        assertNotEquals(provider, nonEqualProvider);
+        assertNotEquals(provider, new Object());
+    }
+
+    /**
+     *
+     */
+    @Test
+    void testHashCode() {
+        byte[] bytes = "PostMalone".getBytes(StandardCharsets.US_ASCII);
+        GravatarProfileTokenProvider provider = new GravatarProfileTokenProvider(() -> bytes, "source");
+        GravatarProfileTokenProvider equalProvider = new GravatarProfileTokenProvider(() -> bytes, "source");
+        GravatarProfileTokenProvider nonEqualProvider
+                = new GravatarProfileTokenProvider(() -> new byte[0], "another source");
+
+        assertEquals(-896505829, provider.hashCode());
+        assertEquals(-896505829, equalProvider.hashCode());
+        assertEquals(1165062104, nonEqualProvider.hashCode());
+        assertNotEquals(equalProvider.hashCode(), nonEqualProvider.hashCode());
+    }
+}