add CameraPermissionHelperTest.kt (#432)

Co-authored-by: Jakob Möller <jakob.moeller@sap.com>

Corona-Warn-App/src/test/java/de/rki/coronawarnapp/util/CameraPermissionHelperTest.kt

+package de.rki.coronawarnapp.util
+
+import android.content.Context
+import de.rki.coronawarnapp.CoronaWarnApplication
+import de.rki.coronawarnapp.util.CameraPermissionHelper.hasCameraPermission
+import io.mockk.MockKAnnotations
+import io.mockk.every
+import io.mockk.impl.annotations.MockK
+import io.mockk.mockkObject
+import io.mockk.unmockkAll
+import org.hamcrest.CoreMatchers
+import org.hamcrest.MatcherAssert
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+
+
+class CameraPermissionHelperTest {
+
+    @MockK
+    private lateinit var context: Context
+
+    @Before
+    fun setUp() {
+        MockKAnnotations.init(this)
+        mockkObject(CoronaWarnApplication)
+    }
+
+
+    /**
+     * Test call order is correct.
+     */
+    @Test
+    fun hasCameraPermissionTest() {
+        every { context.checkPermission(any(), any(), any()) } returns 0
+
+        val result = hasCameraPermission(context)
+        MatcherAssert.assertThat(result, CoreMatchers.`is`(true))
+    }
+
+    @Test
+    fun hasNotCameraPermissionTest() {
+        every { context.checkPermission(any(), any(), any()) } returns 1
+
+        val result = hasCameraPermission(context)
+        MatcherAssert.assertThat(result, CoreMatchers.`is`(false))
+    }
+
+    @After
+    fun cleanUp() {
+        unmockkAll()
+    }
+}
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