Refactor coroutine testing setup (#1583)

* coroutine-utils: init

* coroutine-utils-testing: init

* format-common: switch over to using DispatcherProvider

* Convert Binds method to an extension function

* Add Dispatcher module

2 files changed, 20 insertions, 10 deletions

diff --git a/format-common/src/main/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntry.kt b/format-common/src/main/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntry.kt
index 408069a2..81398b45 100644
--- a/format-common/src/main/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntry.kt
+++ b/format-common/src/main/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntry.kt
@@ -9,6 +9,7 @@ import com.github.michaelbull.result.mapBoth
 import dagger.assisted.Assisted
 import dagger.assisted.AssistedFactory
 import dagger.assisted.AssistedInject
+import dev.msfjarvis.aps.util.coroutines.DispatcherProvider
 import dev.msfjarvis.aps.util.time.UserClock
 import dev.msfjarvis.aps.util.totp.Otp
 import dev.msfjarvis.aps.util.totp.TotpFinder
@@ -32,6 +33,8 @@ constructor(
   clock: UserClock,
   /** [TotpFinder] implementation to extract data from a TOTP URI */
   totpFinder: TotpFinder,
+  /** Instance of [DispatcherProvider] to select an IO dispatcher for emitting TOTP values. */
+  dispatcherProvider: DispatcherProvider,
   /**
    * A cancellable [CoroutineScope] inside which we constantly emit new TOTP values as time elapses
    */
@@ -81,7 +84,7 @@ constructor(
     username = findUsername()
     totpSecret = totpFinder.findSecret(content)
     if (totpSecret != null) {
-      scope.launch {
+      scope.launch(dispatcherProvider.io()) {
         val digits = totpFinder.findDigits(content)
         val totpPeriod = totpFinder.findPeriod(content)
         val totpAlgorithm = totpFinder.findAlgorithm(content)
diff --git a/format-common/src/test/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntryTest.kt b/format-common/src/test/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntryTest.kt
index 2923946e..32066cc3 100644
--- a/format-common/src/test/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntryTest.kt
+++ b/format-common/src/test/kotlin/dev/msfjarvis/aps/data/passfile/PasswordEntryTest.kt
@@ -5,6 +5,7 @@
 
 package dev.msfjarvis.aps.data.passfile
 
+import dev.msfjarvis.aps.test.CoroutineTestRule
 import dev.msfjarvis.aps.util.time.TestUserClock
 import dev.msfjarvis.aps.util.totp.TotpFinder
 import java.util.Locale
@@ -16,15 +17,22 @@ import kotlin.test.assertNull
 import kotlin.test.assertTrue
 import kotlin.time.ExperimentalTime
 import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.test.StandardTestDispatcher
 import kotlinx.coroutines.test.TestScope
 import kotlinx.coroutines.test.runTest
+import org.junit.Rule
 
 @OptIn(ExperimentalCoroutinesApi::class, ExperimentalTime::class)
 class PasswordEntryTest {
 
+  @get:Rule val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
   private fun makeEntry(content: String) =
-    PasswordEntry(fakeClock, testFinder, scope, content.encodeToByteArray())
+    PasswordEntry(
+      fakeClock,
+      testFinder,
+      coroutineTestRule.testDispatcherProvider,
+      TestScope(coroutineTestRule.testDispatcher),
+      content.encodeToByteArray(),
+    )
 
   @Test
   fun testGetPassword() {
@@ -125,19 +133,20 @@ class PasswordEntryTest {
 
   @Test
   @Ignore("Timing with runTest seems hard to implement right now")
-  fun testGeneratesOtpFromTotpUri() =
-    scope.runTest {
+  fun testGeneratesOtpFromTotpUri() {
+    runTest {
       val entry = makeEntry("secret\nextra\n$TOTP_URI")
       assertTrue(entry.hasTotp())
       val code = entry.totp.value
       assertNotNull(code) { "Generated OTP cannot be null" }
       assertEquals("818800", code)
     }
+  }
 
   @Test
   @Ignore("Timing with runTest seems hard to implement right now")
-  fun testGeneratesOtpWithOnlyUriInFile() =
-    scope.runTest {
+  fun testGeneratesOtpWithOnlyUriInFile() {
+    runTest {
       val entry = makeEntry(TOTP_URI)
       assertNull(entry.password)
       assertTrue(entry.hasTotp())
@@ -145,6 +154,7 @@ class PasswordEntryTest {
       assertNotNull(code) { "Generated OTP cannot be null" }
       assertEquals("818800", code)
     }
+  }
 
   @Test
   fun testOnlyLooksForUriInFirstLine() {
@@ -171,9 +181,6 @@ class PasswordEntryTest {
     const val TOTP_URI =
       "otpauth://totp/ACME%20Co:john@example.com?secret=HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ&issuer=ACME%20Co&algorithm=SHA1&digits=6&period=30"
 
-    val dispatcher = StandardTestDispatcher()
-    val scope = TestScope(dispatcher)
-
     val fakeClock = TestUserClock()
 
     // This implementation is hardcoded for the URI above.