#35: test for multiple -f

tests/multicompose/README.md

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+# Multiple compose files
+
+to make sure we get results similar to
+
+```
+docker-compose -f d1/docker-compose.yml -f d2/docker-compose.yml up -d
+docker exec -ti d1_web1_1 sh -c 'set'
+docker exec -ti d1_web2_1 sh -c 'set'
+curl http://${d1_web1_1}:8001/index.txt
+curl http://${d1_web1_1}:8002/index.txt
+```
+
+we need to verify
+
+- project base directory and prject name is `d1` 
+- `var12='d1/12.env'` which means `enf_file` was appened not replaced (which means that we normalize to array before merge)
+- `var2='d1/2.env'` which means that paths inside `d2/docker-compose.yml` directory are relative to `d1`
+
+

tests/multicompose/d1/1.env

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+var1=d1/1.env

tests/multicompose/d1/12.env

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+var12=d1/12.env

tests/multicompose/d1/2.env

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+var2=d1/2.env

tests/multicompose/d1/docker-compose.yml

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+version: '3'
+services:
+  web1:
+    image: busybox
+    command: busybox httpd -h /var/www/html/ -f -p 8001
+    volumes:
+    - ./1.env:/var/www/html/index.txt
+    env_file: ./1.env
+

tests/multicompose/d2/12.env

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+var12=d2/12.env

tests/multicompose/d2/2.env

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+var2=d2/2.env

tests/multicompose/d2/docker-compose.yml

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+version: '3'
+services:
+  web1:
+    env_file: ./12.env
+
+  web2:
+    image: busybox
+    command: busybox httpd -h /var/www/html/ -f -p 8002
+    volumes:
+    - ./2.env:/var/www/html/index.txt
+    env_file: ./2.env
+