Add another test case for venv detection where python is removed

Author: davidkopp

tests/specialized/pip_root_venv_detection/README.md

@@ -0,0 +1,24 @@
+# README
+
+## Origin
+
+Origin of this test was a comment by Arne:
+<https://github.com/green-coding-solutions/green-metrics-tool/pull/1297#issuecomment-3302240294>
+
+This is my Dockerfile:
+
+```dockerfile
+FROM greencoding/gcb_playwright:v20
+
+RUN cd /root && \
+    python3 -m virtualenv venv  && \
+    /root/venv/bin/pip install psutils
+
+CMD ["tail", "-f", "/dev/null"]
+```
+
+psutils is not found
+
+## Test
+
+The test script validates that the issue was resolved.

tests/specialized/pip_root_venv_detection/test_playwright_container.sh renamed to tests/specialized/pip_root_venv_detection/test.sh

@@ -1,13 +1,13 @@
 #!/bin/bash
 
-# Build Playwright container and verify psutils is detected in /root/venv/ by dependency_resolver
+# Build container and verify psutils is detected in /root/venv/ by dependency_resolver
 
 set -e
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 DOCKERFILE_PATH="$SCRIPT_DIR"
 DEPENDENCY_RESOLVER_PATH="$SCRIPT_DIR/../../.."
-CONTAINER_NAME="test-playwright-$(date +%s)"
+CONTAINER_NAME="test-pip-root-venv-detection-$(date +%s)"
 
 echo "Building Docker image from $DOCKERFILE_PATH..."
 docker build -t "$CONTAINER_NAME" -f "$DOCKERFILE_PATH/Dockerfile" "$DOCKERFILE_PATH"

tests/specialized/pip_root_venv_detection_2/Dockerfile

@@ -0,0 +1,12 @@
+FROM greencoding/gcb_playwright:v20
+
+RUN cd /root && \
+    python3 -m virtualenv venv  && \
+    /root/venv/bin/pip install psutils
+
+RUN rm /usr/bin/apt
+RUN rm /usr/bin/dpkg
+RUN rm /usr/bin/dpkg-query
+RUN rm /usr/bin/python3
+
+CMD ["tail", "-f", "/dev/null"]

tests/specialized/pip_root_venv_detection_2/README.md

@@ -0,0 +1,35 @@
+# README
+
+## Origin
+
+Origin of this test was a comment by Arne:
+<https://github.com/green-coding-solutions/green-metrics-tool/pull/1297#issuecomment-3302325317>
+
+My Dockerfile:
+
+```dockerfile
+FROM greencoding/gcb_playwright:v20
+
+RUN cd /root && \
+    python3 -m virtualenv venv  && \
+    /root/venv/bin/pip install psutils
+
+RUN rm /usr/bin/apt
+RUN rm /usr/bin/dpkg
+RUN rm /usr/bin/dpkg-query
+RUN rm /usr/bin/python3
+
+CMD ["tail", "-f", "/dev/null"]
+```
+
+Our tool finds nothing.
+
+## Test
+
+The test fails. The dependency resolver can't resolve the dependencies, because pip can't be executed:
+
+```sh
+/usr/local/bin/pip: cannot execute: required file not found
+```
+
+pip is missing python3.

tests/specialized/pip_root_venv_detection_2/test.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Build container and verify psutils is detected in /root/venv/ by dependency_resolver
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DOCKERFILE_PATH="$SCRIPT_DIR"
+DEPENDENCY_RESOLVER_PATH="$SCRIPT_DIR/../../.."
+CONTAINER_NAME="test-pip-root-venv-detection-2-$(date +%s)"
+
+echo "Building Docker image from $DOCKERFILE_PATH..."
+docker build -t "$CONTAINER_NAME" -f "$DOCKERFILE_PATH/Dockerfile" "$DOCKERFILE_PATH"
+
+echo "Starting container..."
+docker run --rm -d --name "$CONTAINER_NAME" "$CONTAINER_NAME"
+
+echo "Running dependency_resolver on container $CONTAINER_NAME..."
+cd "$DEPENDENCY_RESOLVER_PATH"
+source venv/bin/activate
+
+echo "Checking for psutils in output..."
+if python3 -m dependency_resolver docker "$CONTAINER_NAME" | grep -q "psutils"; then
+    echo "✓ psutils found in dependency output"
+else
+    echo "✗ psutils NOT found in dependency output"
+fi
+
+echo "Cleaning up..."
+docker stop "$CONTAINER_NAME"
+docker rmi "$CONTAINER_NAME"
+
+echo "Test complete!"