ADD (command/scan): unittest for scan execute

tests/command/scan/_execute_test.sh

@@ -0,0 +1,90 @@
+#!/usr/bin/env bash
+
+# /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+function set_up()
+{
+    export TEST_HOME="/tmp/bashunit_config_test_$$"
+    export HOME="${TEST_HOME}"
+
+    mkdir -p "${TEST_HOME}/.config/pdfmt"
+    mkdir -p "${TEST_HOME}/bin"
+
+    cat > "${TEST_HOME}/.config/pdfmt/scan.conf" <<EOF
+scan.device=test:scanner
+scan.source.adf=ADF
+scan.source.flatbed=Flatbed
+scan.resolution=300
+scan.mode=Color
+scan.paper.format=A4
+EOF
+
+    cat > "${TEST_HOME}/bin/scanimage" <<EOF
+#!/usr/bin/env bash
+
+output_file=
+
+for argument in "\$@"; do
+    if [[ "\$argument" == --batch=* ]]; then
+        output_file="\${argument#--batch=}"
+    fi
+done
+
+if [[ -n "\${output_file}" ]]; then
+    output_file="\${output_file//%03d/001}"
+    cp "${ROOT_DIR}/tests/_data/scan.png" "\${output_file}"
+else
+    cat "${ROOT_DIR}/tests/_data/scan.png"
+fi
+EOF
+
+    chmod +x "${TEST_HOME}/bin/scanimage"
+
+    export PATH="${TEST_HOME}/bin:${PATH}"
+
+    # shellcheck disable=SC1091     # ROOT_DIR is provided by the bootstrap.
+    source "$ROOT_DIR/sources/command/scan/_execute.sh"
+}
+
+# /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+function tear_down()
+{
+    rm -rf -- "${TEST_HOME}"
+}
+
+# /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+function test_command_scan_execute_adf()
+{
+    local exit_code=0
+    local -r output_file="${TEST_HOME}/scan.pdf"
+
+    _command_scan_execute \
+        adf \
+        "${output_file}" || exit_code=$?
+
+    assert_same "0" "${exit_code}"
+    assert_file_exists "${output_file}"
+
+    local -r num_pages="$(_pdf_get_num_pages "${output_file}")"
+
+    assert_same "1" "${num_pages}"
+}
+
+# /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+function test_command_scan_execute_scanimage_fails()
+{
+    local exit_code=0
+    local -r output_file="${TEST_HOME}/scan.pdf"
+
+    cat > "${TEST_HOME}/bin/scanimage" <<'EOF'
+#!/usr/bin/env bash
+exit 1
+EOF
+
+    chmod +x "${TEST_HOME}/bin/scanimage"
+
+    _command_scan_execute \
+        adf \
+        "${output_file}" || exit_code=$?
+
+    assert_same "1" "${exit_code}"
+}