Testcase for ToolInstallation support

src/test/java/org/jenkinsci/plugins/casc/GitToolInstallationTest.java

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+package org.jenkinsci.plugins.casc;
+
+import hudson.plugins.git.GitTool;
+import jenkins.model.Jenkins;
+import org.junit.Rule;
+import org.junit.Test;
+import org.jvnet.hudson.test.JenkinsRule;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author <a href="mailto:nicolas.deloof@gmail.com">Nicolas De Loof</a>
+ */
+public class GitToolInstallationTest {
+
+
+    @Rule
+    public JenkinsRule j = new JenkinsRule();
+
+    @Test
+    public void set_git_installations() throws Exception {
+        ConfigurationAsCode.configure(getClass().getResourceAsStream("GitToolInstallationTest.yml"));
+
+        final Jenkins jenkins = Jenkins.getInstance();
+        final GitTool.DescriptorImpl descriptor = (GitTool.DescriptorImpl) jenkins.getDescriptor(GitTool.class);
+        assertEquals(2, descriptor.getInstallations().length);
+        assertEquals("/usr/local/bin/git", descriptor.getInstallation("another_git").getGitExe());
+        assertEquals("/bin/git", descriptor.getInstallation("git").getGitExe());
+    }
+}

src/test/resources/org/jenkinsci/plugins/casc/GitToolInstallationTest.yml

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+
+git:
+  installations:
+    - name: git
+      home: /bin/git
+    - name: another_git
+      home: /usr/local/bin/git
+