diff --git a/tinkoff-id/src/test/java/ru/tinkoff/core/tinkoffId/TinkoffIdSignInButtonTest.kt b/tinkoff-id/src/test/java/ru/tinkoff/core/tinkoffId/TinkoffIdSignInButtonTest.kt
new file mode 100644
index 0000000..eefe858
--- /dev/null
+++ b/tinkoff-id/src/test/java/ru/tinkoff/core/tinkoffId/TinkoffIdSignInButtonTest.kt
@@ -0,0 +1,80 @@
+package ru.tinkoff.core.tinkoffId
+
+import android.content.Context
+import android.os.Build
+import android.text.SpannedString
+import androidx.core.content.res.ResourcesCompat
+import androidx.test.core.app.ApplicationProvider
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+import ru.tinkoff.core.tinkoffId.ui.TinkoffDimen
+import ru.tinkoff.core.tinkoffId.ui.TinkoffIdSignInButton
+
+/**
+ * @author k.voskrebentsev
+ */
+@Config(sdk = [Build.VERSION_CODES.P])
+@RunWith(RobolectricTestRunner::class)
+internal class TinkoffIdSignInButtonTest {
+
+    private lateinit var button: TinkoffIdSignInButton
+
+    @Before
+    fun setUp() {
+        button = TinkoffIdSignInButton(context = context)
+    }
+
+    @Test
+    fun testSetEmptyTitle() {
+        button.title = ""
+
+        val result = button.title as SpannedString
+
+        assertEquals(PERMANENT_TITLE_PART, result.toString())
+    }
+
+    @Test
+    fun testSetTitle() {
+        button.title = CUSTOM_TITLE_PART
+
+        val result = button.title as SpannedString
+
+        assertEquals("$CUSTOM_TITLE_PART $PERMANENT_TITLE_PART", result.toString())
+    }
+
+    @Test
+    fun testDefaultBadgeText() {
+        assertEquals("", button.badgeText)
+    }
+
+    @Test
+    fun testDefaultCompact() {
+        assertEquals(false, button.isCompact)
+    }
+
+    @Test
+    fun testDefaultStyle() {
+        assertEquals(TinkoffIdSignInButton.ButtonStyle.YELLOW, button.style)
+    }
+
+    @Test
+    fun testDefaultCornerSize() {
+        assertEquals(context.resources.getDimension(TinkoffDimen.tinkoff_id_default_corner_radius).toInt(), button.cornerRadius)
+    }
+
+    @Test
+    fun testDefaultFont() {
+        assertEquals(ResourcesCompat.getFont(context, R.font.neue_haas_unica_w1g), button.textFont)
+    }
+
+    companion object {
+        val context: Context = ApplicationProvider.getApplicationContext()
+
+        const val CUSTOM_TITLE_PART = "title"
+        val PERMANENT_TITLE_PART = context.getString(R.string.tinkoff_id_tinkoff_text)
+    }
+}