diff --git a/bitrise.yml b/bitrise.yml
index 0586dea0..c35429f7 100644
--- a/bitrise.yml
+++ b/bitrise.yml
@@ -48,19 +48,19 @@ workflows:
         inputs:
         - build_gradle_path: ./app/build.gradle
         - new_version_code: $BITRISE_BUILD_NUMBER
-    - android-build:
+    - gradle-runner:
         inputs:
         - gradle_task: bundleRelease
         - gradlew_path: ./gradlew
     - sign-apk:
         inputs:
-        - apk_path: $BITRISE_APK_PATH
+        - apk_path: $BITRISE_AAB_PATH
     - path::./:
         title: Step Test
         inputs:
         - service_account_json_key_path: $BITRISEIO_JSON_KEY_URL
         - package_name: $PACKAGE_NAME
-        - app_path: $BITRISE_SIGNED_APK_PATH
+        ## - app_path: $BITRISE_APK_PATH\n$BITRISE_AAB_PATH
         - track: $TRACK
         
   apk_deploy_test:
@@ -131,6 +131,7 @@ workflows:
         - package_name: $PACKAGE_NAME
         - apk_path: $BITRISE_SIGNED_APK_PATH
         - track: $TRACK
+        - mapping_file: ""
 
   dep-update:
     steps:
diff --git a/config.go b/config.go
index a4845eb6..fbb5f795 100644
--- a/config.go
+++ b/config.go
@@ -91,13 +91,28 @@ func parseAPKList(list string) []string {
 	return strings.Split(list, "|")
 }
 
+func splitElements(list []string, sep string) (s []string) {
+	for _, e := range list {
+		s = append(s, strings.Split(e, sep)...)
+	}
+	return
+}
+
 func parseAppList(list string) (apps []string) {
-	for _, app := range strings.Split(list, "\n") {
-		apps = append(apps, strings.TrimSpace(app))
+	list = strings.TrimSpace(list)
+	if len(list) == 0 {
+		return nil
 	}
-	if len(apps) == 0 {
-		for _, app := range strings.Split(list, "|") {
-			apps = append(apps, strings.TrimSpace(app))
+
+	s := []string{list}
+	for _, sep := range []string{"\n", `\n`, "|"} {
+		s = splitElements(s, sep)
+	}
+
+	for _, app := range s {
+		app = strings.TrimSpace(app)
+		if len(app) > 0 {
+			apps = append(apps, app)
 		}
 	}
 	return
@@ -131,7 +146,7 @@ func (c Configs) appPaths() ([]string, []string) {
 	}
 
 	if len(aabs) > 0 {
-		return aabs[:0], warnings
+		return aabs[:1], warnings
 	}
 
 	return apks, warnings
diff --git a/config_test.go b/config_test.go
new file mode 100644
index 00000000..add0e31f
--- /dev/null
+++ b/config_test.go
@@ -0,0 +1,118 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_parseAppList(t *testing.T) {
+	tests := []struct {
+		name     string
+		list     string
+		wantApps []string
+	}{
+		{
+			name:     "empty app list",
+			list:     "",
+			wantApps: nil,
+		},
+		{
+			name:     "newline separated list",
+			list:     "app.apk\napp.aab\n \n",
+			wantApps: []string{"app.apk", "app.aab"},
+		},
+		{
+			name:     "pipe separated list",
+			list:     "|app.apk|app.aab|",
+			wantApps: []string{"app.apk", "app.aab"},
+		},
+		{
+			name:     "pipe and newline separated list",
+			list:     "\napp1.apk|app2.apk\napp.aab|",
+			wantApps: []string{"app1.apk", "app2.apk", "app.aab"},
+		},
+		{
+			name:     "pipe and newline separated list",
+			list:     "/bitrise/deploy/app-bitrise-signed.aab\n/bitrise/deploy/app.aab",
+			wantApps: []string{"/bitrise/deploy/app-bitrise-signed.aab", "/bitrise/deploy/app.aab"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if gotApps := parseAppList(tt.list); !reflect.DeepEqual(gotApps, tt.wantApps) {
+				t.Errorf("parseAppList() = %v, want %v", gotApps, tt.wantApps)
+			}
+		})
+	}
+}
+
+func TestConfigs_appPaths(t *testing.T) {
+	tests := []struct {
+		name         string
+		config       Configs
+		wantApps     []string
+		wantWarnings []string
+	}{
+		{
+			name: "empty test",
+			config: Configs{
+				AppPath: "",
+				ApkPath: "",
+			},
+			wantApps:     nil,
+			wantWarnings: nil,
+		},
+		{
+			name: "prefers aab",
+			config: Configs{
+				AppPath: "app.apk|app.aab",
+			},
+			wantApps:     []string{"app.aab"},
+			wantWarnings: []string{"Both .aab and .apk files provided, using the .aab file(s): app.aab"},
+		},
+		{
+			name: "uses deprecated input (ApkPath) if set",
+			config: Configs{
+				AppPath: "app.aab",
+				ApkPath: "app.apk",
+			},
+			wantApps:     []string{"app.apk"},
+			wantWarnings: []string{"step input 'APK file path' (apk_path) is deprecated and will be removed on 20 August 2019, use 'APK or App Bundle file path' (app_path) instead!"},
+		},
+		{
+			name: "uses first aab",
+			config: Configs{
+				AppPath: "app.aab\napp1.aab",
+			},
+			wantApps:     []string{"app.aab"},
+			wantWarnings: []string{"More than 1 .aab files provided, using the first: app.aab"},
+		},
+		{
+			name: "unknown extension",
+			config: Configs{
+				AppPath: "mapping.txt",
+			},
+			wantApps:     nil,
+			wantWarnings: []string{"unknown app path extension in path: mapping.txt, supported extensions: .apk, .aab"},
+		},
+		{
+			name: "newline (\n) as a character",
+			config: Configs{
+				AppPath: `/bitrise/deploy/app-bitrise-signed.aab\n/bitrise/deploy/app.aab`,
+			},
+			wantApps:     []string{"/bitrise/deploy/app-bitrise-signed.aab"},
+			wantWarnings: []string{"More than 1 .aab files provided, using the first: /bitrise/deploy/app-bitrise-signed.aab"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotApps, gotWarnings := tt.config.appPaths()
+			if !reflect.DeepEqual(gotApps, tt.wantApps) {
+				t.Errorf("Configs.appPaths() gotApps = %v, want %v", gotApps, tt.wantApps)
+			}
+			if !reflect.DeepEqual(gotWarnings, tt.wantWarnings) {
+				t.Errorf("Configs.appPaths() gotWarnings = %v, want %v", gotWarnings, tt.wantWarnings)
+			}
+		})
+	}
+}
diff --git a/step.yml b/step.yml
index df7d3642..2b22a302 100644
--- a/step.yml
+++ b/step.yml
@@ -76,7 +76,7 @@ inputs:
       is_required: true
   - app_path: $BITRISE_APK_PATH\n$BITRISE_AAB_PATH
     opts:
-      title: App file path.
+      title: App file path
       description: |-
         Path to the App Bundle or APK file(s) to deploy.
 
@@ -171,6 +171,8 @@ inputs:
     opts:
       title: APK file path
       description: |-
+        __This input is deprecated and will be removed on 20 August 2019, use `App file path` input instead!__
+
         Path to the APK to deploy.
 
         You can provide multiple APK paths separated by `|` character.