add install test

.github/workflows/install.yml

@@ -0,0 +1,30 @@
+name: Install
+
+on: [push]
+
+env:
+  CTEST_OUTPUT_ON_FAILURE: 1
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    
+    - name: install
+      run: |
+        cmake -H. -Bbuild
+        cmake --build build --target install
+
+    - name: configure
+      run: cmake -Htest -Bbuild/test -DTEST_INSTALLED_VERSION=1
+
+    - name: build
+      run: cmake --build build/test --config Debug
+
+    - name: test
+      run: |
+        cd build/test
+        ctest --build-config Debug

test/CMakeLists.txt

@@ -7,6 +7,7 @@ project(GreeterTests
 # ---- Options ----
 
 option(ENABLE_TEST_COVERAGE "Enable test coverage" OFF)
+option(TEST_INSTALLED_VERSION "Test the version found by find_package" OFF)
 
 # ---- Dependencies ----
 
@@ -19,10 +20,14 @@ CPMAddPackage(
   GIT_TAG 2.3.2
 )
 
+if (TEST_INSTALLED_VERSION)
+  find_package(Greeter)
+else()
   CPMAddPackage(
     NAME Greeter
     SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/..
   )
+endif()
 
 CPMAddPackage(
   NAME Format.cmake