diff --git a/Cargo.lock b/Cargo.lock
index acdbb5ce7a3..e5c6ce10106 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -99,6 +99,17 @@ version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf8dcb5b4bbaa28653b647d8c77bd4ed40183b48882e130c1f1ffb73de069fd7"
 
+[[package]]
+name = "assert-json-diff"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4259cbe96513d2f1073027a259fc2ca917feb3026a5a8d984e3628e490255cc0"
+dependencies = [
+ "extend",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "async-compression"
 version = "0.3.6"
@@ -300,6 +311,7 @@ dependencies = [
  "lettre",
  "license-exprs",
  "log",
+ "mockito",
  "oauth2",
  "parking_lot",
  "rand",
@@ -441,6 +453,17 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "colored"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4ffc801dacf156c5854b9df4f425a626539c3a6ef7893cc0c5084a23f0b6c59"
+dependencies = [
+ "atty",
+ "lazy_static",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "comrak"
 version = "0.9.0"
@@ -752,6 +775,12 @@ dependencies = [
  "migrations_macros",
 ]
 
+[[package]]
+name = "difference"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
+
 [[package]]
 name = "digest"
 version = "0.8.1"
@@ -822,6 +851,18 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "extend"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f47da3a72ec598d9c8937a7ebca8962a5c7a1f28444e38c2b33c771ba3f55f05"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.8"
@@ -1694,6 +1735,24 @@ dependencies = [
  "ws2_32-sys",
 ]
 
+[[package]]
+name = "mockito"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36a0eb7e686b49b02c1cb87c14b8e2a05de0d36c6eee0293653d0a875906d499"
+dependencies = [
+ "assert-json-diff",
+ "colored",
+ "difference",
+ "httparse",
+ "lazy_static",
+ "log",
+ "rand",
+ "regex",
+ "serde_json",
+ "serde_urlencoded",
+]
+
 [[package]]
 name = "native-tls"
 version = "0.2.6"
diff --git a/Cargo.toml b/Cargo.toml
index cadaa2294c9..eb53f0db270 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -93,6 +93,7 @@ conduit-test = "0.9.0-alpha.3"
 diesel_migrations = { version = "1.3.0", features = ["postgres"] }
 hyper-tls = "0.4"
 lazy_static = "1.0"
+mockito = "0.28"
 tokio = { version = "0.2", default-features = false, features = ["stream"]}
 tower-service = "0.3.0"
 
diff --git a/src/admin/on_call.rs b/src/admin/on_call.rs
index bc180b32bf1..47cbceaeebf 100644
--- a/src/admin/on_call.rs
+++ b/src/admin/on_call.rs
@@ -25,11 +25,17 @@ impl Event {
     /// If the variant is `Trigger`, this will page whoever is on call
     /// (potentially waking them up at 3 AM).
     pub fn send(self) -> Result<()> {
+        #[cfg(not(test))]
+        let base_url = "https://events.pagerduty.com";
+        #[cfg(test)]
+        let base_url = mockito::server_url();
+
         let api_token = dotenv::var("PAGERDUTY_API_TOKEN")?;
         let service_key = dotenv::var("PAGERDUTY_INTEGRATION_KEY")?;
 
+        let url = format!("{}/generic/2010-04-15/create_event.json", base_url);
         let response = Client::new()
-            .post("https://events.pagerduty.com/generic/2010-04-15/create_event.json")
+            .post(&url)
             .header(header::ACCEPT, "application/vnd.pagerduty+json;version=2")
             .header(header::AUTHORIZATION, format!("Token token={}", api_token))
             .json(&FullEvent {
@@ -66,3 +72,75 @@ struct InvalidEvent {
     message: String,
     errors: Vec<String>,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::Event;
+    use mockito::{mock, Matcher};
+    use std::env;
+
+    #[test]
+    fn test_send() {
+        // set environment variables for this test
+        env::set_var("PAGERDUTY_API_TOKEN", "secret123");
+        env::set_var("PAGERDUTY_INTEGRATION_KEY", "crates-io-service-key");
+
+        // setup the pagerduty API endpoint mock
+        let response_body = json!({
+            "description": "possible spam attack underway",
+            "event_type": "trigger",
+            "incident_key": "spam_attack",
+            "service_key": "crates-io-service-key"
+        });
+
+        let mock = mock("POST", "/generic/2010-04-15/create_event.json")
+            .match_header("Accept", "application/vnd.pagerduty+json;version=2")
+            .match_header("Authorization", "Token token=secret123")
+            .match_header("Content-Type", "application/json")
+            .match_body(Matcher::Json(response_body))
+            .with_status(200)
+            .create();
+
+        // create and send the event
+        let event = Event::Trigger {
+            incident_key: Some("spam_attack".into()),
+            description: "possible spam attack underway".into(),
+        };
+
+        let result = event.send();
+
+        // check that the mock endpoint was triggered
+        mock.assert();
+        assert_ok!(result);
+    }
+
+    #[test]
+    fn test_send_with_400_error() {
+        // set environment variables for this test
+        env::set_var("PAGERDUTY_API_TOKEN", "secret123");
+        env::set_var("PAGERDUTY_INTEGRATION_KEY", "crates-io-service-key");
+
+        // setup the pagerduty API endpoint mock
+        let request_body = json!({
+            "message": "oops",
+            "errors": ["something", "went", "wrong"],
+        });
+
+        let mock = mock("POST", "/generic/2010-04-15/create_event.json")
+            .with_status(400)
+            .with_body(request_body.to_string())
+            .create();
+
+        // create and send the event
+        let event = Event::Trigger {
+            incident_key: Some("spam_attack".into()),
+            description: "possible spam attack underway".into(),
+        };
+
+        let result = event.send();
+
+        // check that the mock endpoint was triggered
+        mock.assert();
+        assert_err!(result);
+    }
+}