ci: Test against Carthage build

.gitignore

@@ -19,3 +19,4 @@ DerivedData
 Pods
 Carthage
 *.idea
+features/fixtures/carthage-proj

.travis.yml

@@ -8,7 +8,9 @@ matrix:
           env: PLATFORM=iOS
           # Xcode 11+ no longer ships with all device combinations premade
           before_script: xcrun simctl create "13-xs" "iPhone XS" com.apple.CoreSimulator.SimRuntime.iOS-13-0
-          script: make test OS=13.0 DEVICE="iPhone XS"
+          script: 
+            - make test OS=13.0 DEVICE="iPhone XS"
+            - make build_carthage
         - osx_image: xcode10.2
           env: PLATFORM=iOS
           script:
@@ -19,6 +21,7 @@ matrix:
             - make test OS=10.3.1
             - make test OS=9.3
             - make test OS=9.3 TEST_CONFIGURATION=Release
+            - make build_carthage
           after_success:
             - bash <(curl -s 'https://codecov.io/bash') -Z -J '^Bugsnag$' -X gcov -X coveragepy -X fix -D build
         - osx_image: xcode10.2 # macos 10.14

Makefile

@@ -49,6 +49,14 @@ build: ## Build the library
 build_ios_static: ## Build the static library target
 	$(XCODEBUILD) -project iOS/Bugsnag.xcodeproj -scheme BugsnagStatic
 
+build_carthage: ## Build the latest pushed commit with Carthage
+	@mkdir -p features/fixtures/carthage-proj
+	@echo 'github "bugsnag/bugsnag-cocoa" "'$(shell git rev-parse HEAD)'"' > features/fixtures/carthage-proj/Cartfile
+	@cd features/fixtures/carthage-proj && \
+		carthage update --platform ios && \
+		carthage update --platform tvos && \
+		carthage update --platform macos
+
 bump: ## Bump the version numbers to $VERSION
 ifeq ($(VERSION),)
 	@$(error VERSION is not defined. Run with `make VERSION=number bump`)