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Currency Converter

Currency converter by using revolut api

  • Fetches update currencies from revolut api every 1 second.
  • Calculates other currencies by using users currency and amount selection

sample_image

Architecture

Modules

  • App -> Contains App code & Tests
  • Common -> Contains common variables such as constants
  • Repo -> Contains local and remote repo, models and local databases here.

diagram

Libraries - App & Testing

  implementation project(':repo')
  implementation project(':common')

  // Dagger
  kapt "com.google.dagger:dagger-compiler:${libraries.dagger2Version}"
  kapt "com.google.dagger:dagger-android-processor:${libraries.dagger2Version}"

  implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'

  //Logger
  implementation "com.orhanobut:logger:${libraries.logger}"
  api "com.squareup.okhttp3:logging-interceptor:${libraries.okhttp}"

  testImplementation "org.junit.jupiter:junit-jupiter-api:${libraries.jUnit}"
  testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:${libraries.jUnit}"
  androidTestImplementation "de.mannodermaus.junit5:android-instrumentation-test:${libraries.jUnitInstrumentation}"
  androidTestRuntimeOnly "de.mannodermaus.junit5:android-instrumentation-test-runner:${libraries.jUnitInstrumentation}"

  //  mockk
  testImplementation("io.mockk:mockk:${libraries.mockkVersion}")
  testImplementation 'androidx.arch.core:core-testing:2.1.0'
  testImplementation "com.google.truth:truth:${libraries.truthVersion}"

  implementation 'androidx.recyclerview:recyclerview:1.1.0'

  implementation 'com.squareup.picasso:picasso:2.71828'

Sample unit test, see all in view model test class.

    @Test
    @DisplayName("When base currency changed, get correct base currency and correctly observed")
    fun testBaseCurrencyChanges(){

        every { localService.setCurrencyCode("EUR") } returns Completable.complete()


        every {
            localService.getLastSelectedCurrency().subscribe {
                Truth.assertThat(it.code).isEqualTo("EUR")
            }
        }

    }

Thanks

Possible improvements

Store last updated currencies and display last known currencies to user by informing last update date, so when there is no internet use can see last updated currencies.

Create UI tests by Appium - Selendroid

Improve font according to branding and set company logo.

Add splash screen.